Browsing by Author "Yildiz, K"

Now showing 1 - 20 of 51
  • No Thumbnail Available
    Item
    Investigating the role of adsorbent type and ratio in mitigating 3-MCPD and GE formation during the inhibition of palm oil chemical interesterification via earth treatment
    Yildiz, K; Özdikicierler, O; Ergönül, PG
    This study examined the potential to mitigate 3-monochloropropane-1,2-diol esters (3-MCPDE) and glycidyl esters (GE) during the inhibition phase of chemical interesterification in refined, bleached, and deodorized (RBD) palm olein oil. Two types of bleaching earth, natural and acid-activated, were used at concentrations ranging from 3% to 6%, and their impact on ester formation was evaluated. Chemical interesterification and adsorption treatments significantly improved oil quality and reduced ester levels (p < 0.05). Specifically, using 6% bleaching earth led to a 98.5% reduction in 3-MCPDE and a 98.3% reduction in GE. The type of bleaching earth did not significantly affect the reduction of these contaminants, while the amount of bleaching earth used played a crucial role in the mitigation.
  • No Thumbnail Available
    Item
    Seed morphology of some Silene L. (Caryophyllaceae) species collected from Turkey
    Dadandi, MY; Yildiz, K
    The seed micro- and macromorphology of 39 Silene taxa were studied by stereomicroscope and scanning electron microscope. Quantitative (9) and qualitative (11) values of seed characters vary greatly both within and between taxa. The tree topology of UPGMA based on quantitative values does not supported the traditional relationship. Therefore, we concluded that seed characters of Silene alone cannot be used to describe taxa without detecting the full range of intra- and intertaxon variation of those characters.
  • No Thumbnail Available
    Item
    Karyological Studies in Some Species of the Genus Silene (Caryophyllaceae)
    Minareci, E; Yildiz, K; Çirpici, A
    Karyology of the 6 Silene species from Turkey was investigated. Diploid chromosome numbers and the basic chromosome number of the studied taxa were obtained as 2n=24 and x=12 respectively. The karyotype analysis of S. viscosa, S. eremitica, S. skorpilii and S. confertiftora were carried out for the first time. Also the chromosome numbers of S. eremitica and S. confertiflora were determined for the first time. The largest chromosomes were observed in S. otites and the smallest ones were observed in S. viscosa. S. otites shows the highest A(1) index. S. skorpilii represents the highest interchromosomal asymmetry coefficient (A(2)). The karyologic results oh the study and the analysis of chromosomal morphology of each taxon were shown as tables.
  • No Thumbnail Available
    Item
    Rosularia globulariifolia var. pallidiflora comb. et stat. nov (Crassulaceae)
    Minareci, E; Yildiz, K; Gucel, S; Kuh, M
    Rosularia globulariifolia (Fenzl) A. Berger and R. pallidiflora (Holmboe) Meikle were originally described as species in Umbilicus DC. in 1842 and 1914, respectively. In the present study, morphological and palynological features were examined in detail to determine the status of these taxa. The general characteristics, seed structure and micromorphology, pollen measurements and pollen characteristics were established. Morphologically, the two taxa cannot easily be distinguished. Pollen grains of both species are tricolporate, subspheroidal and eutectate, ornamentation is psilate and exine structures are similar. Based on morphological and palynological similarities, and the fact that both taxa are found in the same habitats, we propose that R. pallidiflora should be reduced to the rank of variety as Rosularia globulariifolia (Fenzl) A. Berger var. pallidiflora (Meikle) Minareci & K. Yildiz comb. et stat. nov.
  • No Thumbnail Available
    Item
    Traditional Uses of Medicinal Plants in Artuklu, Turkey
    Kiliç, M; Yildiz, K; Kiliç, FM
    We conducted an ethnobotanical field study of traditional medicinal plants in 91 villages of Artuklu District among four ethnic groups: Turkish, Kurdish, Arabic, and Assyrian. We interviewed 365 elderly informants and recorded traditional uses of 85 identified botanical taxa, including four endemic species previously unidentified as medicinal plants:Arum rupicolaBoiss.,Gundelia mesopotamicaFirat,Alkanna trichophilaHub.-Mor., andCrocus leichtlinii(Dewar) Bowles. We gathered data specifically on medicinal uses of these taxa to determine the relative importance of the species surveyed and calculate the informant consensus factor (FIC) in relation to medicinal plant use. The highest use values were recorded for the speciesTeucrium poliumL. (0.78),Urtica dioicaL. (0.60) andCrataegus azarolusL., (0.59), while the highest FIC was for gynecological diseases (0.93).
  • No Thumbnail Available
    Item
    Seed morphology of Caryophyllaceae species from Turkey (North Anatolia)
    Yildiz, K
    Scanning electron microscopy (SEM) techniques were used to investigate the macro and micromorphology of seed of 17 species (12 genera) of Caryophyllaceae, All material Studied was collected from North Anatolia (Square A3-A8 of Flora of Turkey). Three of the species are endemic for Turkey. Some important character states identified were: Seed type: Reniform, ovoid, reniform to orbicular, orbicular, peltate, scaled-winged, winged, cylinderical, ovoid to reniform; seed surface type: Flat-concave, flat, convex, wringed crugosus aculeate, concavo-convex, rounded; tubercle shape: Tall/short conical, obtuse, rounded, flat and aculeate-verrucate, digitate; surface granulation: Medium, fine and coarse or not; suture outline: Digitate/serrate/ stellate/sharply-sinuous, fine digitate and sharply serrate; hylar zone: Recessed, prominent, facial and flat.
  • No Thumbnail Available
    Item
    POLLEN MORPHOLOGY OF CARYOPHYLLACEAE SPECIES FROM TURKEY
    Yildiz, K
    The pollen morphology of 45 species, 11 of which are endemic, belonging to 15 genera of Caryophyllaceae was investigated by light (LM) and scanning electron microscopy (SEM). On the basis of exine structure, ornamentation and morphological data, 10 distinct pollen types viz., 1. Arenaria type, 2. Stellaria holostea L., 3. Cerastium type, 4. Dianthus type 5. Gypsophila repay type, 6. Lychnis viscaria type, 7. Silene vulgaris type, 8. Silene caryophylloides subsp. subulata (Poiret) Otth, 9. Silent conica type and 10. Agrostemma githago L., were recognized. Pollen grains are tectate, spheroidal, polypantoporate, microechinate (spinulose), perforate, microperforate (punctate tubuliferous), reticulate and semireticulate. Significant differences in grain size and pore number are also found in all the species. The biggest grains are in Silene L., and Agrostemma L., species, whereas the smallest grains are in Petrorhagia (Ser.) Link. The most advanced species of Caryophyllaceae regarding evolution are found in Silene and Agrostemma.
  • No Thumbnail Available
    Item
    A morphological investigation on Silene L., (Caryophyllaceae) species distributed in west Anatolia and north Cyprus
    Yildiz, K
    In this study, the morphology of Silene sipylea (L.) O. Schwarz, S. fabaria (L.) Sibth. & Sm., S. tenuiflora Guss., S. lydia Boiss. distributed in West Anatolia (B1, C1, C2) and S. discolor Sibth. & Sm., S. colorata Poir. var. colorata, S. apetala Willd. var. grandiflora distributed in North Cyprus was investigated. Making use of fresh specimens collected from both geographical regions, drawings of the general view and parts of the plant such as the flower, parts of the flower (sepal, petal), fruit were made, and micrographs of the seeds taken by stereo light microscopy. Significant morphological and seed characters related to the species are presented. Longest calyx was encountered in S. sipylea and the shortest in S. apetala var. grandiflora while S. lydia, S. discolor, S. colorata var. colorata and S. apetala var. grandiflora had puberulent calyx, S. sipylea, S. fabaria and S. tenuiflora had a glabrous calyx. S. fabaria, S. tenuiflora and S. apetala var. grandiflora were found to have 10 anastomotic veins in the calyx, whereas S. discolor, S. colorata var. colorata and S. sipylea had 10, and S. lydia 25-30 in the calyx. Ligula were observed in the basal petal blades of all the species. Ligula of S. sipylea and S. lydia are quite small. The anthophore in S. lydia is approximately I mm and as long as 25-30 mm in S. sipylea The seeds of S. colorata var. colorata and S. apetala var. grandiflora are distinct from those of the other species, they are reniform shaped, round, winged and wrinkled. The largest seeds were observed in S. tenuiflora and the smallest in S. discolor. The tubercles are quite distinct in S. lydia and S. tenuiflora has an elongated conical shape.
  • No Thumbnail Available
    Item
    A palynological study of the genus Smyrnium (Umbelliferae) from Turkey
    Mungan, F; Yildiz, K; Minareci, E; Kiliç, M
    In this study, the pollen morphology and exine structure of six taxa of the genus Smyrnium L. (Umbelliferae) were investigated using light microscopy and scanning electron microscopy (SEM). Eight micromorphological characters (pollen shape, apocolpium, mesocolpium, polar length, equatorial width, exine thickness, colpus length and colpus width) of pollen grains of Smyrnium have been identified. The palynological observations revealed that pollen grains of all studied taxa of Smyrnium were prolate in shape and posses tricolporate aperture. Tectal surface sculpture was not a good criterion to identify particular taxa from Smyrnium. The pollen of which is characterized by rugulate, the pollen ornamentation was similar in all studied taxa. In addition the taxa could be included in sub-rectangular pollen type as classified by Cerceau - Larrival.
  • No Thumbnail Available
    Item
    BECAUSE I CHOOSE TO: REASONS FOR WOMEN TO CHOOSE BOUTIQUE FITNESS CENTERS
    Yildiz, K; Yumuk, ED; Ekim, N; García-Fernández, J
    Objectives: The aim of this study is to investigate the women's perspective about boutique fitness center and explain their opinions through service quality dimension and demands of these customers. Methodology/Approach: The study was in qualitative research technique and phenomenology pattern was used. The study sample consisted of 9 female customers of a private boutique fitness centers selected. The data was collected through face-to-face interview and content analysis method was used in the analysis of the data. Main results: The results show that female participants' opinions about preferring the boutique fitness centers are linked in the sub-themes as Socialization, Physical Changes, Location & Transport, Security, Customer-oriented, Environment and Program of the theme Preference Reasons. In conclusion, the most significant factors affecting participants to take part in boutique fitness centers are physical changes, socialization and program. Theoretical and methodological contributions: The paper theoretically contributes to the literature related to boutique fitness centers by revealing reasons for female customers to choose boutique fitness centers in terms of experiential point of view.
  • No Thumbnail Available
    Item
    The Effect of Gambling Motivation of Sport Spectators on Propensity for Violence in Sport
    Polat, E; Yildiz, K
    The study aims to analyse the relationships between sport spectators' gambling motivation and propensity for violence. Descriptive and relational screening model were used in this study. Study group is composed of 539 volunteers determined via purposeful and convenient sampling. Personal Information Form was prepared by the researchers of the study; andGambling Motivations ScaleandSport Spectators Aggression and Violence Scalewere used to gather the data. For inferential statistics, Pearson Correlation Analysis was conducted to reveal the relationships between some variables and sub-scales of measurement tools. Furthermore, multi variable relations between sub-scales of Gambling Motivation Scale and sub-scales of The Sport Spectator Aggression and Violence Scale were analysed through Canonical Correlation Analysis. The results of correlation analysis show that there is a weak significant positive correlation between both the frequency of sport gambling and gambling motivation, and between the frequency of sport gambling and sport spectators' aggression in all sub scales. In addition, weak significant and positive correlation between both the level of fandom and gambling motivation, and the level of fandom and aggression of spectators was found in all sub-scales. As for the correlation between consuming alcohol before matches and gambling motivation and sport spectators aggression, not consuming alcohol before matches was found significantly high correlated compared to consuming alcohol before matches. In conclusion, it can be said there is a relation between gambling motivation and aggression and propensity for violence. Moreover, it can be thought the fact that the perceived fandom level of gambler sport spectators is high causes the increase in aggression and propensity for violence.
  • No Thumbnail Available
    Item
    MORPHOLOGICAL INVESTIGATIONS AND TRANSPLANTATION ATTEMPTS ON SOME ENDEMIC SPECIES OF NORTHERN CYPRUS
    Gücel, S; Yildiz, K
    The aim of this study was to investigate the morphology of 10 endemic taxa Pimpinella cypria, Ferulago cypria, Limonium albidum subsp. cyprium, Onosma caespitosum, Origanum syriacum var. bevanii, Salvia veneris, Sideritis cypria, Phlomis cypria var. cypria, Scutellaria sibthorpii and Teucrium cyprium subsp. kyreniae distributed in Northern Cyprus. These belong to the families Apiaceae, Plumbaginaceae, Boraginaceae, and Lamiaceae. All these species are distributed only on the Beshparmak mountains in the northern part of Cyprus and arc under a threat of extinction due to severe habitat degradation arising from human activities, forests fires and stone queries. The micrographs of the seeds were taken by means of trinocular stereo dissection microscope, and detailed morphological features recorded from the fresh and dried samples collected during 2001-2004. An attempt has been made for transplantation of these species to some protected sites.
  • No Thumbnail Available
    Item
    Taxonomy of Campanula tomentosa Lam. and C. vardariana Bocquet from Turkey
    Alcitepe, E; Yildiz, K
    The taxonomical status of Campanula tomentosa Lam. and C. vardariana Bocquet, belonging to the section Quinqueloculares (Boiss.) Phitos, which have important taxonomical problems, was reviewed in this study. Furthermore, morphological, anatomical leaf surface, and palynological features of these 2 species were examined in detail. Habit, shape of leaves, calyx, corolla, stamen, pistil, and seed micromorphological features as morphological characters; and pollen diameter, pore diameter, spinule length, and number, ornamentation, etc. as palynological characters, were examined and discussed. An identification key for the species is presented according to the results obtained. Following this extensive study, the mentioned problems of C. tomentosa and C. vardariana in the flora of Turkey were solved, and it was verified that they were 2 different species.
  • No Thumbnail Available
    Item
    Karyotype characterization of Turkish taxa of the genus Asperula L. - section Thlipthisa (Rubiaceae)
    Minareci, E; Yildiz, K
    Karyotype studies were performed in five taxas of Asperula viz., Asperula brevifolia, A. pseudochlorantha var. pseudochlorantha, A. pseudochlorantha var. antalyensis, A. serotina and A. purpurea subsp. apiculata from the section Thlipthisa, and their diploid (2n), and the basic (x) chromosome numbers were determined as 2n=22 and x=11, respectively. Chromosome length varied from 0.80 gm (A. serotina) to 2.40 mu m (A. brevifolia). Chromosomes are principally metacentric except for A serotina, which has submetacentric chromosomes. A. serotina showed the highest intrachromosomal assymetry coefficient (A(1)) index and A. pseudochlorantha var. antalyensis represented the highest interchromosomal asymmetry coefficient (A(2)). The chromosome numbers of A. brevifolia, A. serotina and A. purpurea subsp. apiculata were reported for the first time.
  • No Thumbnail Available
    Item
    A taxonomic study of the Silene sections Behenantha and Dichotomae (Caryophyllaceae) in Turkey based on the micromorphology of their seed and pollen
    Kuh, M; Yildiz, K; Minareci, E
    The seed and pollen grain micromorphologies of 10 taxa of the Silene sections Behenantha and Dichotomae (Caryophyllaceae) were analyzed in this study. Although the seeds of the analyzed taxa were generally reniform, S. tenuiflora and S. koycegizensis from the section Behenantha were clearly distinct from other taxa, while subspecies of S. dichotoma and S. euxina in the section Dichotomae showed differences. Pollen grains are periporate and spheroidal and ornamentation is generally spinulate-microperforate in all taxa. However, ornamentation is spinulate in S. euxina and semireticulate in S. koycegizensis. While the exine structure is generally tectate, it is semitectate in S. koycegizensis. It was found that S. heldreichii and S. cariensis subsp. muglae had the highest number of pores, while S. dichotoma subsp. racemosa had the lowest number of pores. The results showed that S. euxina can be distinguished from S. dichotoma based on morphological characteristics of their pollen grains and seeds.
  • No Thumbnail Available
    Item
    Pollen morphology of Silene L. (Caryophyllaceae) from Turkey
    Yildiz, K
    Morphology of pollen grains of 13 species (3 of which are endemies in Turkey) belonging to nine sections of the genus Silene L., (Caryophyllaceae), collected from Northwest Anatolia in Turkey, was investigated using light, scanning electron (SEM) and projectina screen scale microscopy. The pollen gains were pantoporate, spheroidal and semitectate with perforations, spinulose exine, S. rhynchocarpa Boiss., with highest number and S. otites (L) Wibel with lowest number of pores have the right taxonomical positions. The taxonomical position of S, compacta Fischer and S. dichotoma Ehrh. subsp sibthorpiana (Reichb) Reich, which have flowers forming heads and are monochasial is disputed because they have lower pore number in relation to the other taxa, although they have other phylogenetically advanced characteristics.
  • No Thumbnail Available
    Item
    A RESEARCH ON SOCIAL PRESENCE IN E-LEARNING AND ACADEMIC SELF-EFFICIENCY IN SPORT MANAGEMENT DURING CONFINEMENT BY COVID-19
    Yildiz, K; Yumuk, ED; García-Fernández, J; Lara-Bocanegra, A
    This study aims to examine the relationship between social presence and academic self-efficacy of university sports management students in e-learning process during confinement by Covid-19. The participants were 461 students (227 females and 234 males), who were selected through convenience sampling participated in the study voluntarily. Social Presence for E-Learning Environments Scale and Academic Self-efficacy Scale were used as data collection tools in the study. Parametric tests such as Independent T test, Pearson Correlation Analysis and Multiple Regression test were used to analyze the data. In correlation test results, moderately positive relationships were found between sub-scales of social presence scale and academic self-efficacy scale for e-learning environments. When the zero-order and partial correlations between the predictor variables and the dependent variables were examined, it was seen that the sub-scales of the social presence scale for e-learning environments had a predictive effect on academic self-efficacy. Consequently, making learning goals attractive may positively affect the presence levels of individuals in the education and training process. Therefore, using the innovations brought by the digital age we live in in the education and training process may increase the interest and self-efficacy of individuals towards learning.
  • No Thumbnail Available
    Item
    A karyotypic study on Silene, section Siphonomorpha species of Turkey
    Yildiz, K; Minareci, E; Cirpici, A; Dadandi, MY
    Karyology of the eight taxa of Silene sect. Siphonomorpha known from Turkey was investigated. Diploid chromosome numbers and the basic chromosome number of the studied taxa were obtained as 2n=24 and x=12, respectively. A karyotype analysis of the studied taxa was carried out and the chromosome numbers of S. splendens, S. amana and S. phrygia were determined for the first time. The smallest chromosomes were observed in S. fruticosa and the largest in S. italica subsp. italica. Silene splendens showed the highest A(1) index, whereas S. amana had the highest interchromosomal asymmetry coefficient (A(2)). The karyologic results of the study and the analysis of chromosomal morphology of each taxon is presented.
  • No Thumbnail Available
    Item
    Pollen morphology of sections Siphonomorpha and Lasiostemones of the genus Silene from Turkey
    Yildiz, K; Dadandi, MY; Minareci, E; Çirpici, A
    The pollen morphology of 16 taxa belonging to the sections Siphonomorpha Otth and Lasiostemones Boiss. from the genus Silene L. (Caryophyllaceae) was examined via scanning electron microscopy (SEM). Pollen types among all of the examined taxa were spheroidal, ornamentations were generally microechinate-microperforate (punctate), but perforate in Silene viridiflora L., structures were mostly tectate but were observed to be semitectate only in S. viridiflora, the highest pore numbers were found in S. fruticosa L. and S. viridiflora, the lowest pore numbers were those of S. gigantea L. subsp. rhodopea (Janka) Greuter and S. marschallii C.A.Mey., and interpore distance was greatest in S. gigantea subsp. rhodopea and smallest in S. amana Boiss. The widest perforation was observed in S. Viridiflora, whereas the lowest value was observed in S. olympica Boiss. As a result of these detailed examinations, some Silene species with significant taxonomic problems were reviewed in terms of palynology, and suggestions are provided about their positions. S. viridiflora was determined to be the taxon with the most different pollen morphology according to general characters. According to pore number and perforation, the most advanced taxon was S. Viridiflora, while the most primitive taxa were found to be S. olympica, S. gigantea subsp. rhodopea, and S. olympica.
  • No Thumbnail Available
    Item
    Phylogenetic relationships of Silene sections Lasiostemones and Sclerocalycine (Caryopilyliaceae) in Iran
    Bahmani, F; Assadi, M; Yildiz, K; Mehregan, I
    A phylogenetic study of Silene sect. Lasiostemones and sect. Sclerocalycine in Iran is presented. A total of 72 accessions (43 of which obtained from GenBank) were analyzed using nuclear ITS and chloroplasi rps16 markers. It was shown that sect. Lasiostemones is not a monophyletic group, including members which would belong to sect. Sclerocalycine (i.e. S. tenella, S. longipetala, S. lasiantha, S. marschallii, S. propinqua) and sect. Siphonomorpha (i.e. S. ghahremaninejadii, S. shahrudensis, S. saxatilis, S. ruprechtii, S. parrowiana).