Browsing by Author "Guney K."

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An Investigation on the antimicrobial activity of some endemic plant species from Turkey
(2008-01-04) Benli M.; Bingol U.; Geven F.; Guney K.; Yigit N.
In this study performed on six endemic plant species, antimicrobial activity was observed in Campanula lyrata subsp.lyrata and Abies nordmanniana subsp. bornmuelleriana plants. The minimum inhibitory concentration of C. lyrata subsp. lyrata (leaf and flower) extract was found to be ≥ 29 mg/ml for Baccillus subtilis and ≥ 14.5 mg/ml for Staphylococcus aureus, and the minimum inhibitory concentration (MIC) of Abies nordmanniana subsp. bornmuelleriana (leaf) extract was found to be > 314 mg/ml for B. subtilis and when minimum bacteriocidal concentration (MBC) results were evaluated, it was observed that the plant extracts had bacteriocidal effects. No antimicrobial activity was observed in the other plant extracts, namely, Onosma bornmuelleri (leaf- flower), Dianthus balansae (leaf- flower), Alyssum pateri subsp. pateri (seed) and Scabiosa columbaria subsp. paphlagonica (leaf) extracts that were tested. © 2008 Academic Journals.
Anticancer and biological properties of leaf and flower extracts of Echinacea purpurea (L.) Moench
(2021-06-01) Mohamed Sharif K.O.; Tufekci E.F.; Ustaoglu B.; Altunoglu Y.C.; Zengin G.; Llorent-Martínez E.J.; Guney K.; Baloglu M.C.
Echinacea purpurea (L.) Moench is an important medicinal herb; its roots, leaves and, flowers have been used by the food and pharmaceutical industries. In this study, DNA protection, antimicrobial, antioxidant-enzyme inhibition, and antiproliferative activities of water, methanol (MeOH), and ethyl acetate (EA) extracts of leaves and flowers of E. purpurea were evaluated. In addition, total phenolics and flavonoids, as well as individual compounds, were identified using colorimetric assays and HPLC-ion trap mass spectrometry, respectively. Chicoric acid and its isomer were the most abundant natural compounds, with concentrations similar to previous studies of E. purpurea. All extracts had antimicrobial activity against a broad range of bacteria, particularly Enterococcus faecalis. The antiproliferative activity of the extracts on the HeLa cells was shown. The lowest value of IC50 (73 μg/ml) came from the 24 h MeOH extract of flowers. The water extract of leaves showed strong antioxidant activity with the DPPH, ABTS, CUPRAC, and FRAP assays. EA and MeOH extracts of leaves showed a significant inhibition ability of cholinesterase and tyrosinase, respectively. The presented study suggested that E. purpurea extracts had promising therapeutic properties. Further investigation at the cellular level could be done to highlight the mechanism behind these biological activities.
Characterization of Divalent Metal Soaps of Cannabis Sativa Seed Oil
(Gazi Üniversitesi, 2023-09-01) Yetgin S.; Egbuchunam T.; Okieimen F.; Gokkus K.; Guney K.
n this study, the structural characteristics and thermal degradation behaviour of barium, calcium and zinc soaps of hemp seed oil prepared using the metathesis method are reported. Scanning electron micrographs of the metal soaps showed similar plate-like microstructures and are indicative of an orderly packed particulate structure. The bands at 1509, 1539 and 1543 cm-1 in the FTIR spectra showed the association of the carboxylate ion with Ba, Ca and Zn ions respectively The thermal decomposition consisted of one single step on the weight loss – temperature curves located around 250 – 450oC for all the divalent metal soaps at the various heating rates and the observed loss in weight which occurred before 200oC was minimal (< 10%). The average values of the apparent activation energy for the thermal process were 18.73, 13.77 and 8.48 kJ/mol for Zn-HSO, Ca-HSO and Ba-HSO respectively.
Effect of rooting hormones on the rooting capability of Ficus benjamina L. cuttings
(2016-01-01) Topacoglu O.; Sevik H.; Guney K.; Unal C.; Akkuzu E.; Sivacioglu A.
Vegetative production techniques, of which cutting method widely used in propagation of ornamental plants, have a crucial role for conserving the plant genetic sources. On rooting development of stem cuttings, cutting position, rooting medium and rooting hormone are some of the critical factors that affect the success. The primary objective of this study is to determine the best hormone doses and ideal rooting medium on Ficus benjamina L. stem cuttings. Conventionally, the most frequently vegetative propagation method is the rooting of the stem cuttings in various media such as, pearlite, peat, sand, through exposure to high-concentration rooting hormones (IBA, IAA, NAA, etc.). But, this conventional technique requires wide areas in the rooting stage of mass production, prevents monitoring the course of rooting, and necessitates large amount of materials used as hormones and rooting media. In this study, a new method that may be preferable in mass production of plants was tested. 39 different treatments were carried out, and their results were evaluated. Sand, and perlite were used as solid rooting media. Stem cuttings were kept in low-concentration hormones permanently after cutting (liquid medium). In this way, their rooting capability were examined. Rooting trials were conducted before stem cuttings were taken to solid rooting media. As conclusions, the highest rooting ratio were obtained for 10 ppm of NAA (94.43%) and 100 ppm of IBA (93.9%) in liquid media. Moreover, the highest root length and the average root length were quite low in liquid media.
Effects of IAA, IBA, NAA, and GA3 on rooting and morphological features of melissa officinalis L. stem cuttings
(2013-07-01) Sevik H.; Guney K.
This study analyzed the potential of producing Melissa officinalis L. using stem cuttings. Four different hormones (IAA, IBA, NAA, and GA3) were applied to the cuttings, with and without buds, in two doses (1000 mg/L and 5000 mg/L), and after 60 days, 10 morphological characteristics of newly generated plants were detected, and a statistical analysis was carried out. The results of the study show that the cuttings with at least one bud must be used in order to produce M. officinalis using stem cuttings. Even though the auxin group hormones (IAA, IBA, and NAA) do not have an apparent effect on rooting percentage, these hormones were detected to affect the morphological characteristics of the newly generated plants, especially root generation. GA3 application has a considerable effect on stem height. © 2013 Hakan Sevik and Kerim Guney.
Influence of germination percentage and morphological properties of some hormones practice on Lilium martagon L. Seeds
(2016-01-01) Guney K.; Cetin M.; Sevik H.; Guney K.B.
Lilies are economically important plants because of their large and attractive flowers. Thus, many wild species of lilies have been cultivated to produce Lilium bulbs or flowers. However, some non-cultivated species are still picked from the nature and sold, which damages the natural populations of the species. The easiest and the most effective way of preventing them from being picked from the nature is the identification of easy and cheap methods of producing them. The method is to carry out the germination percentage of the seeds of certain hormones on Lilium martagon applications. In this study, after hormone applications, new germinated seed was determined to analyse the effect of morphological characteristics. In research, 1000, 3000 and 5000 ppm doses of IAA (indoleacetic acid), IBA (indole-3-butyric acid), NAA (naphthalene acetic acid) and GA3 (gibberellic acid) hormones were applied to Lilium martagon seeds and approximately 180 days later, the number of roots, root length, offset stem height and diameter were evaluated. According to the results of the Duncan test and variance analysis, IAA and NAA hormones were found to influence germination percentage, while GA3 and IBA influenced the number of roots and root length, and IBA influenced offset stem heights. The effects of hormone applications on different characteristics differ and the effect changes as the application dose changes.
The effect of some indoor ornamental plants on CO2 levels during the day
(2018-01-01) Sevik H.; Cetin M.; Guney K.; Belkayali N.
The aim of the present study is to determine the effect of yucca (Yucca elephantipes Regel), dieffenbachia (Dieffenbachia amoena Gentil), and spathiphyllum (Spathiphyllum floribundum Schott) as common types of indoor plants on CO2 levels in the environment. The study was conducted in a closed environment where air inlet/outlet was absent. As a result, the plants were found to affect the level of CO2 in the environment to different extents; and while Dieffenbachia began to respire at around 13:00 hrs, yucca and spathiphyllum continued to photosynthesize until 19:00. While dieffenbachia and spathiphyllum could not lower the CO2 level in the environment to below 500 ppm, yucca could decrease it to 475 ppm in a day. The results of the study demonstrated that CO2 levels in photosynthesis during the day were 8.3, 5.8, and 1.4 times more in yucca, spathiphyllum, and dieffenbachia, respectively, in comparison with CO2 levels released through respiration.
The effects of some hormone applications on Lilium martagon L. germination and morpholgical characters
(2017-01-01) Guney K.; Cetin M.; Guney K.B.; Melekoglu A.
Lilium martagon L. is a perennial geophyte species belonging to the large Liliaceae family. Its population is at the status of ‘’VU’’ in the Red Data Book of Turkish Plants, and along with many European countries, it is included in Turkey’s list of plants that are endemic and imperiled. This study analyzed the potential of producing Lilium martagon L. with teeth. Four different hormones (IAA: iIndole-3-acetic acid; IBA: indole-3-butyric acid; NAA: naphthylacetic acid; and GA3: gibberellic acid) were applied in three doses (1,000, 3,000, and 5,000 ppm) on apical, medium, and basal parts and after 120 days, six morphological characteristics were determined. According to the results, 1,000 ppm IBA implementation is seen as the most effective hormone dose implementation on morphological characters. According to the effect of fraction position, for all characters the individuals formed by the pieces taken from the bottom parts of teeth are included in the first homogeneous group. Also, it is revealed that each of the apical, medium, and basal parts were obtained by cutting nail-like scales on the corpus in three equal pieces and have the potential for meristematic reproduction ability.
The influence of house plants on indoor CO2
(2017-01-01) Sevik H.; Cetin M.; Guney K.; Belkayali N.
This study aimed at determining the effect of carbon dioxide (CO2) in the internal environment of different indoor plants. Spathiphyllum (Spathiphyllum floribundum Schott), Yucca (Yucca elephantipes Regel), Dieffenbachia (Dieffenbachia amoena Gentil), and Ficus (Ficus benjamina L.) are frequently used in studies of indoor plants that examine light temperature depending on leaf surface and the effects of CO2 in the studied environment. As a result, decreases in CO2 were at the highest level in Ficus, and Dieffenbachia at 25°C, followed by Spathiphyllum at 25°C and Yucca at 20°C. The amount of photosynthesis increased the leaf surface. For this reason, they reduced the amount of CO2 by increasing the amount of photosynthesis. The plant leaf surface was standardized, and calculations were made to meet the objective and the amount of CO2 in the local environment. Based on these calculations, it was determined that the greatest reduction of CO2 comes from the Ficus plant. In conclusion, the same layer as the surface are 1 m2 leaf surface from Ficus benjamina on 1 m3 without air vent in which the amount of CO2 in one hour could be reduced to about the level from 2,000 ppm at 25°C 480.74 ppm and 408.08 ppm at 20°C.