Gülten Ökmen

Muğla University · Department of Biology

Dental caries and periodontal diseases are common oral conditions associated with the formation of dental plaque. Dental plaque is composed of the oral microbiota and accumulates on the tooth surface. Despite the development of numerous antiseptic agents to control bacterial growth, the issue of bacterial resistance has prompted scientists to explo...

Foodborne pathogens pose a significant hazard to food safety. Most cases of foodborne illnesses are caused by bacterial pathogens that have infiltrated the food chain at some point, from farm to kitchen. According to the World Health Organization (WHO), approximately one-third of individuals in developed countries are affected by foodborne pathogen...

Food products contaminated with pathogens and spoiled not only lead to a decrease in the quality and quantity of food products but also contribute to the spread of diseases, which are increasingly becoming a public health problem in both developed and developing countries. Due to the multiple resistance of these pathogens to antibiotics, the search...

Mastitis is one of the most considerable and costly diseases for dairy herds, and Staphylococcus spp. is known to be the main causative agent. Although antibiotics are widely used in the treatment of mastitis, this can cause both antibiotic residues in milk and the risk of antibiotic resistance occurrence in bacteria. Thus, in recent years, researc...

There is an expanding interest in medicinal and aromatic plants as a natural alternative to synthetic drugs, especially to antimicrobial agents due to the growing problem of antibiotic resistance. In recent years, a lot of reports have been published on the antimicrobial activity of the plant extracts. This study was used Lavandula angustifolia L.,...

The objective of this study is to develop a new and effective antibacterial agent against food pathogens that poses a major threat to human health and to investigate the antioxidant activity of this plant. Methanol, ethanol, and aqueous extracts were analyzed for antimicrobial potency. Eight different microorganisms were used in the study, one of w...

Food spoilage pathogens threaten to human health. In this work was studied biological activity of plant known as the “kurtludiken” in Turkey and it is contributed to the literature. Cardopatium corymbosum L. from Mugla region were collected for antimicrobial and antioxidant activity studies. The antimicrobial activity studies were done by disc diff...

Senecio vernalis Waldst. et Kit. is an annual herbaceous plant that has phytotherapeutical importance. Its aerial parts have been extensively used for healing wounds in traditional medicine. In this study, S. vernalis samples collected from the lakes region (Burdur) were examined for the characterization of their phenolic contents, chemical composi...

The most common bacterial agents cause inflammation in the mammary gland (mastitis), which disease cause to less yields in cows. These bacteria are Staphylococcus aureus and Coagulase-negative Staphylococci (CNS). Therefore, these bacteria were selected in this study. The purpose of this study is to research the antibacterial and antioxidant potent...

Recent studies indicate that the microbial ecosystem is not limited to specific areas but may also be found in extreme temperature, extreme salt, extreme pH, extreme pressure, etc. Haloarchaea enzymes are very resistant to salinity stress and also have thermotolerant properties according to environmental conditions. Very few studies have been publi...

Mastitis is a common disease in dairy farms and causes serious financial loss. The use of unconscious drugs used for the treatment of infections causes the increase of antibiotic resistant bacteria. A major cause of mastitis is microorganisms. For this reason, this research focuses on antibacterial effects of Cardopatium corymbosum (L.) Pers. extra...

Mastitis is a common disease in dairy farms and causes serious financial loss. The use of unconscious drugs used for the treatment of infections causes the increase of antibiotic resistant bacteria. A major cause of mastitis is microorganisms. For this reason, this research focuses on antibacterial effects of Cardopatium corymbosum (L.) Pers. ext...

The antibacterial and antioxidant activities of Lavandula stoechas and Crepis sancta extracts on subclinical mastitis bacteria in cows have not been reported to the present day. The aim of this work was to investigate of the antibacterial and antioxidant potential of methanol extract from L. stoechas and C. sancta. Methanol extracts were screened f...

Plants are an important source of substances which are claimed to induce biological activities. Although there are a few studies on antimicrobial and antioxidant activities of this plant, antimutagenic activity has not been studied and there is no study in Turkey. Antibacterial activities of Syzygium aromaticum against oral pathogens have not been...

Foodborne pathogens are microorganisms as well as a number of parasites, which are capable of infecting humans via contaminated food or water. In recent years, diseases caused by foodborne pathogens have become an important public health problem in the world, producing a significant rate of morbidity and mortality. In traditional medicine, numerous...

Antibiotic resistance is being constantly developed worldwide. Coagulase Negative Staphylococci (CNS) and Staphylococcus aureus are common causes of bovine subclinical mastitis. Bioactive compound of medicinal plants shows anti-microbial, anti-mutagenic and anti-oxidant effects. The anti-bacterial and anti-oxidant activities of Liquidambar oriental...

Objective: Microorganisms have an easier entry into the sportsman’s epidermis, and these make diseases on athletes. The main scope of the study is to search the lack of information about the biological activities of Mentha piperita extracts against bacteria isolated from soccer player’s shoes. Materials and Methods: The bacteria were isolated from...

Objective/Purpose: Bacteria causes one of the most common types of chronic mastitis. The most common causative organisms of mastitis include: Staphylococci, Streptococci and coliforms. The scope of this work was to research the antibacterial effects of Piper nigrum extracts against mastitis pathogens, and its antioxidant capacity. Materials and Met...

Background Staphylococcus aureus is the direct reason of mastitis. Mastitis is a disease characterized by pathological changes in mammary glands as well as physical, chemical, bacteriological changes in milk. This disease causes loses in milk yield and quality. In recent years, it is reported that mastitis pathogens have developed a resistance to a...

Background: Mastitis reduces milk yield and alters milk composition. Antibiotics are widely used in the treatment of the disease. However, this widespread use of antibiotics causes both antibiotic residues in milks and antibiotic resistance developed in bacteria. Today's researches are focused on discovering and using new antibiotics against bacte...

Foodborne pathogens are microorganisms as well as a number of parasites, which are capable of infecting humans via contaminated food or water. In recent years, diseases caused by foodborne pathogens have become an important public health problem in the world, producing a significant rate of morbidity and mortality. In traditional medicine, numerous...

Günümüze kadar, gıda patojenlerine karşı baharat özütlerinin antimikrobiyel aktivitesi üzerine çok az çalışma yapılmıştır. İlaveten, baharatların antioksidan aktiviteleri hakkında çok az bilgi vardır. Bu çalışmanın amacı, gıda patojenlerine karşı baharat özütlerinin antimikrobiyel etkilerini ve bunların enzimatik olmayan antioksidan potansiyellerin...

Mastitis is a complex disease, which is defined as inflammation of parenchyma of mammary glands. Antibiotics are widely used in the treatment of mastitis. However, this widespread use of antibiotics causes both antibiotic residues in milks and antibiotic resistance developed in bacteria. The aim of this work was to investigate the antibacterial eff...

The aim of this study was to investigate the antimicrobial potentials of Cyclamen mirabile extracts. Methanol and ethanol extracts were scanned for antimicrobial activity against food pathogens. 8 various microorganisms were used in this study, one of these is yeast. The methanol extract of Cyclamen mirabile against Bacillus subtilis showed maximum...

Background: Medicinal plants are an important source of substances which are claimed to induce antimicrobial, antimutagenic and antioxidant effects. Many plants have been used due to their antimicrobial treatments. Antimicrobial and antioxidant activities of L. orientalis have not been reported to the present day. The aim of this work was to inves...

The aim of this work was to investigate the antimicrobial, antioxidant, and antimutagenic potentials of methanol extracts from E. angustifolia. Methanol extracts were screened for antimicrobial activity against different species of 4 Gram positive and 3 Gram negative bacteria and one fungus. These bacteria included food pathogens. The leaf extract...

The lipolytic activities of 300 Streptomyces isolates were determined in Tributyrin and Rhodamine-B Agar. Lipase activities were also measured with p-nitrophenyl palmitate (p-NPP) as a substrate. The strain of Streptomyces bambergiensis OC 25-4 used in this study was selected among 300 strains of Streptomyces from MUCC as the best lipase producer....

Gıda kaynaklı hastalıklar tüm Dünya’da giderek artan ciddi bir halk sağlığı sorunu olarak karşımıza çıkmaktadır. Bunun ana nedeni mikroorganizmalar olarak saptanmıştır. Tüketici, gıdalardan mikroorganizmaların uzaklaştırılması için daha doğal araçların kullanımı yönünde baskı oluşturmaktadır. Çeşitli yaklaşımlar olmasına rağmen bu güne kadar en faz...

Pigments are frequently use in medicine, food, pharmacology, cosmetic, ink and textile preparations. Cyanobacteria have a great potential for use as pigment producer, because they are easy to grow with simple nutrient requirements, unlike other microbial systems and additionally have a large number of pigment. Cyanobacteria produce some pigments su...

In this study, E. angustifolia L. was collected from different localities of Mugla in Turkey. Antibacterial and antioxidant activities of E. angustifolia L. have not been reported to the present day. The aim of the present study was to investigate the in vitro antibacterial and antioxidant activity of methanol extracts of E. angustifolia leaves. Me...

Modern paddy cultivation worldwide involves extensive use of agrochemicals. Herbicides may cause acute and genetic toxicity which are perilous for biota. Bentazon is widely used to control weeds in Turkey rice fields in postemergence applications. The goal of this study was to determine the effect of bentazon on the pigment contents of cyanobacteri...

In this study, usability of plant essential oils from Lamiaceae species for Aeromonas salmonicida infections was investigated under in vitro and in vivo conditions. A total of 18 A. salmonicida strains were obtained from the organs and tissues of locally cultured rainbow trout. All strains were 100% resistant to penicillin, trimethoprim and bacitra...

The goal of this study was to determine the effect of bispyribac-sodium on the nitrogenase activities and growth of cyanobacteria isolated from paddy fields. Ten cyanobacterial species were used in this study. Cyanobacterial species were isolated from soil and water samples obtained from rice fields in Corum, Turkey. Among all Anabaena strains, the...

The present study aimed to investigate the effects of various zinc concentrations (2.5 mg/l to 80 mg/l) on biomass, chlorophyll a, total carbohydrate and total protein contents of 10 cyanobacterial species. Biomass, chlorophyll a and carbohydrate content in all of cyanobacterial species were measured by spectrophotometric method. Zinc is toxic to t...

The antimicrobial activity of the n-hexane, chloroform, ethyl acetate and ethyl alcohol extracts from the aerial parts of T. oligolepis, endemic to Turkey collected from Mugla area, was evaluated against microorganisms including multiantibiotic resistant bacteria. These activities were determined using the disc diffusion method, with 25 μl of each...

The antimicrobial activity of the n-hexane, chloroform, ethyl acetate and ethyl alcohol extracts of the aerial parts of P. sandrasica, endemic to Turkey collected from Mugla area, was evaluated against microorganisms including multiantibiotic resistant bacteria. These activities were determined using the disc diffusion method, with 25 μl of each ex...

The focus of this study was the in vitro antimicrobial activities of Streptomycetes, bacteria commonly found in soil and known antibiotic-producers. Streptomycete isolates obtained from different fields in Muðla, Turkey were evaluated for their inhibitory activities on seven microorganisms including multiple antibiotic resistant Staphylococcus aure...

Samples were collected from paddy fields in Corum-Turkıye. Nitrogen-free BG-11 medium was used for isolation of nitrogen fixing cyanobacteria. Acetylene reduction technique was used to determine the effects of different chemical agents on the nitrogenase activities of the cyanobacteria, which were identified at the genus level. Nostoc showed the hi...

Örnekler, Çorum-Osmancık bölgesindeki çeltik alanlarından toplandı. Azot fikse eden siyanobakterilerin izolasyonunda, azot içermeyen BG-II besiyeri kullanıldı. Toplam 26 izolatın 13 adeti Lyngbya, 10 adeti Anabaena, 1 adeti Oscillatoria, 1 adeti Synechococcus ve 1 adeti Synechocystis cinsine ait bulundu. Cins düzeyinde tanımlanan siyanobakterilerin...

Acetylene reduction technique was used to determine the effects of different physical and chemical agents on the nitrogenase activities of the cyanobacteria, which were identified at the genus level. Ideal incubation time at optimum pH levels was determined as 45 days for all genera.Moreover, in all genera while 600 lux light intensity was resulted...