Agricultural and Biological Sciences, Plant Science, Food Science, Forestry
16
Scopus Publications
573
Scholar Citations
13
Scholar h-index
14
Scholar i10-index
Scopus Publications
Biochemical Profiles of Three Bryophytes: Sphagnum papillosum, Rhytidiadelphus triquetrus, and Ditrichum gracile Onur Tolga Okan, Cemalettin Baltaci Chemistry and Biodiversity, 2026 This study compared Sphagnum papillosum, Rhytidiadelphus triquetrus , and Ditrichum gracile in terms of total phenolic content (TPC), total flavonoid content (TFC), antioxidant activities (DPPH, ABTS, ferric reducing antioxidant power [FRAP]), phenolic profiles, fatty acid compositions, and mineral contents. S. papillosum had the highest TPC (986.11 mg GAE/kg) and ABTS activity (9732.14 mg Trolox/kg). R. triquetrus showed the highest TFC (874.01 mg QE/kg) and was rich in protocatechuic (18 803 mg/g) and 4‐hydroxybenzoic acids (23.219 mg/g). Although D. gracile had lower antioxidant activity, it contained high lipid (6.71%) and ash (27.66%) levels, along with substantial potassium (73 573.86 mg/kg) and calcium (26 135.94 mg/kg) accumulation. Palmitic acid (C16:0) was the dominant fatty acid in all species. These results demonstrate significant biochemical variation among the studied mosses, underlining their potential as sources of natural antioxidants, bioindicators of environmental stress, and candidates for bioremediation.
Phenolic and antioxidant assessment of the flowers, stems, leaves, and fruits of Rosa pimpinellifolia and Rosa canina at different growth time Mehmet Öz, Onur Tolga Okan, Cemalettin Baltaci Horticultural Science, 2026 <br>Natural plants are abundant intheir native habitats and are traditionally used totreat avariety ofhealth conditions. The <i>Rosa</i> genus stands out asanimportant species rich inbioactive compounds. This study, conducted inTrkiye, aimed toanalyse the antioxidant and phenolic profiles ofmethanolic extracts obtained from different parts of<i>Rosa canina</i> (<i>R</i>.<i>c</i>.) and <i>Rosa pimpinelifolia</i> (<i>R</i>.<i>p</i>.) collected in2021 and 2022. The antioxidant activity values of<i>R</i>.<i>c</i>. collected in2021 and 2022 were found tobebetween 5 102.31–46 396.36mmol Fe(II)/100g inferric reducing antioxidant power (FRAP), 141.92–377.54mg ascorbic acid equivalents (AA)/kg intotal antioxidant capacity(TAC), 2.18–24.68µg/g in2,2-diphenyl-1-picrylhydrazyl [DPPH (EC<sub>50</sub>)] and 34.31–75.77 % inDPPH(% inhibition). Antioxidant activity of<i>R</i>.<i>p</i>. collected in2021 and 2022 ranged from 17 258.44–71 903.20mmol Fe(II)/100g, 271.69–479.19mg AA/kg, 1.02–8.32µg/g and 50.98–85.57% for FRAP, TAC, DPPH (EC<sub>50</sub>) and DPPH (% inhibition), respectively. The <i>R</i>.<i>p</i>. extracts generally exhibited higher antioxidant activity than those of<i>R</i>.<i>c</i>. Considering the total identified phenolic compounds achieved from different plant parts ofrosehip for both years, the highest values oftotal phenolic compounds were determined in<i>R</i>.<i>c</i>. leaves (222.08mg/100g) in2021, and <i>R</i>.<i>p</i>. leaves (5 465.95 mg/100 g) in 2021.
Chemical Constituents and Bioactivity Studies of Two Polytrichaceae Species, Polytrichum formosum Hedw. and Polytrichum commune Hedw. Onur Tolga Okan Bioresources, 2025 This study aimed to assess the chemical composition, specifically metal content, phenolics, and fatty acids, of two bryophyte species, Polytrichum formosum and Polytrichum commune, which belong to the Polytrichaceae family. The bioactivities of these species were also evaluated. Microwave plasma atomic emission spectroscopy was used to analyze 13 elements, revealing the presence of 10 elements at varying concentrations in both species. Iron (Fe) was the most prominent element in P. formosum, with a concentration of 7610 mg/kg, whereas calcium (Ca) was the most prominent element in P. commune, at a concentration of 8430 mg/kg. The high-performance liquid chromatography mass spectrometry analysis revealed the presence of 53 phenolic compounds, with quinic acid, protocatechuic acid, and fisetin being the most prominent with concentrations of 4.45, 2.26, and 1.46 mg analyte/g extract, respectively. When evaluated for total phenolic content, P. commune had a higher concentration of phenolic compounds than P. formosum. The fatty acid profile obtained via gas chromatography-mass spectrometry analysis revealed higher concentrations of oleic acid (36.6% for P. formosum and 38.0% for P. commune) and palmitic acid (35.5% for P. formosum and 33.8% for P. commune). Three independent assays assessed the antioxidant capacities of both plants, which revealed significant antioxidant potential in both species.
Physicochemical Properties, Antioxidant Capacity and Sensory Acceptability of Instant Rosehip Teas Prepared by Spray-Drying and Freeze-Drying Methods Cemalettin Baltaci, Dilara Erkmen Bostanci, Rahime Altintaş, Yusuf Dalkiran, Arda Akdoğan, Onur Tolga Okan Polish Journal of Food and Nutrition Sciences, 2024 In this study, the physicochemical properties, antioxidant capacity, sensory properties, and phenolic and mineral profiles of instant rosehip teas prepared using spray-drying (SD) and freeze-drying (FD) were compared. The yield of instant tea produced using FD and SD was 23.75 and 21.25 g/100 g, respectively. The total color difference between the FD and SD tea was 50.74, with the SD sample exhibiting higher redness and yellowness. The FD tea was richer in ascorbic acid than SD tea (67.2 and 59.4 mg/100 g dry weight, DW, respectively). The mineral content ranged from 0.20 mg/kg DW (copper) to 2,837 mg/kg DW (potassium) in SD tea, and from 0.31 mg/kg DW (copper) to 3,083 mg/kg DW (potassium) in FD samples. The total phenolic content was 1,315 and 1,495 mg GAE/100 g DW of SD and FD samples, respectively. The antioxidant capacity of instant rosehip teas was determined as total antioxidant capacity, ferric reducing antioxidant power and DPPH radical scavenging activity. In all these assays, FD tea was found to have a higher antioxidant capacity. In the phenolic profile determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS) technique, protocatechuic acid dominated in instant rosehip teas prepared using both methods. The main flavonoids identified were quercetin, quercitrin, hyperoside and luteolin 7-glucoside. Following the sensory analysis, the panelists have generally preferred the FD tea in terms of aroma and flavor, while opting for the SD tea in terms of appearance and color. In conclusion, although freeze-drying allowed obtaining a product with a higher antioxidant capacity and antioxidant content than spray-drying, both drying methods may be considered suitable for the production of instant rosehip teas and ensure obtaining a functional food product.
Determination of the Chemical Composition, Antioxidant and Antimicrobial Activities of Different Parts of Rosa canina L. and Rosa pimpinellifolia L. Essential Oils Mehmet Öz, Ilhan Deniz, Onur Tolga Okan, Cemalettin Baltaci, Seyda Merve Karatas Journal of Essential Oil Bearing Plants, 2021 Today, the use of essential oils is increasing day by day, and it is considered as raw materials in many industries. Therefore, this study aims to identify the essential oil profile, antioxidant and antimicrobial activity of Rosa canina L. and Rosa pimpinellifolia L. reveal their potential use in the industry. Essential oils that were obtained in 2013-2014 from different parts (flower, leaf, stem, and fruit) of Rosa canina L. and Rosa pimpinellifolia L. by the hydro-distillation method were analyzed by GC/MS. The dominant components in Rosa canina L. were found as trans-geraniol in the flowers (42.08 % for 2013), linalool in the leaves (11.55 % for 2014), and stem (14.91 % for 2013) and vitispirane in the fruits (37.19 % for 2014). The dominant components in R. pimpinellifolia L. were found as heneicosane in the flowers (22.07 % for 2014), γ-elemene in the leaves (30.21 % for 2013), linalool in the stem (14.76 % for 2013) and the fruits, (E)-2-hexenal for those collected in 2013 (14.09 %). The IC50 and FRAP values of the samples ranged from 127.54 to 142.22 μg/g and 121.43 to 296.78 μmol TE/g, respectively. According to the results obtained, both R. canina L. and R. pimpinellifolia L. were found to show poor antioxidant values of DPPH and FRAP. In general, it was determined that the essential oils obtained from different plant parts of both species had a moderate antimicrobial effect against Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Bacillus cereus, and Pseudomonas aeruginosa.
Some edible forest fruits their in vitro antioxidant activities, phenolic compounds and some enzyme inhibition effects Fresenius Environmental Bulletin, 2019
An investigation on Trakya region Oak (Quercus spp.) honeys of Turkey: Their physico-chemical, antioxidant and phenolic compounds properties Sevgi Kolayli, Zehra Can, Hilal Ebru Çakir, Onur Tolga Okan, Oktay Yildiz Turkish Journal of Biochemistry, 2018 Objective The purpose of this study was therefore to investigate various physicochemical properties, phenolic composition and antioxidant capacities of the oak honey, large quantities of which are produced in the Thrace region of Northwest Turkey. Methods Hunter color values (Lab), optical rotation, electrical conductivity, moisture and ash were measured as physicochemical determinants. Sugar, proline content, mineral, phenolic acids, total phenolic flavonoids contents were evaluated as chemical parameters. Ferric reducing antioxidant power (FRAP) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging were used as antioxidant determinants. Results The results determined that dark-colored honeys (mean 24.95±8.35 L) have proline levels (649.82±203.90 mg/kg), total phenolic content (TPC) (67.29±13.10 mgGAE/100 g) and total flavonoid content (TFC) (10.14±4.78 mgQE/100 g), a high ratio of fructose/glucose (1.65±0.18). Rutin (11.14±8.50 μg/g), p-coumaric acid (6.97±5.80 μg/g) and protocatechuic acid (6.12±4.39 μg/g) were the major phenolic components, and quercetin was also detected in varying amounts in all samples. Potassium (2523±0.28 mg/kg), calcium (63.40±3.20 mg/kg) and magnesium (38.88±0.65 mg/kg) were the major minerals in the honeys. Conclusion Our results showed that physicochemical properties, phenolic compounds, antioxidant capacity, sugar and mineral contents successfully distinguish the geographical origins of oak honey. These findings will contribute to a more accurate evaluation of oak honey in the literature.
Distinctive delignification with consecutive application of Geobacillus SP. 71 Xylanase and Rhodococcus jostii Rha1 lignin peroxidase Aysegul Ozer, Sabriye Canakci, Gozde Gocmen, Ilhan Deniz, Huseyin Kirci, Onur Tolga Okan, Ali Osman Belduz Maderas Ciencia Y Tecnologia, 2018 In present study, single and consecutive applications of xylanase and lignin peroxidase were performed in an XOQP TCF sequence to bleach pine and eucalypts kraft pulp. The consecutive use of Geobacillus sp. strain 71 xylanase and Rhodococcus jostii RHA1 lignin peroxidase was more effective than the single uses. XyzGeo71 treatment (X) indicates a 9.76% and 28.52% reduction in kappa number for pine and eucalypts kraft pulps, respectively. LiPRHA1 treatment (X) showed a 7.88% and 20.9% reduction a in kappa number for pine and eucalypts kraft pulps, respectively. The consecutive treatment of XyzGeo71 and LiPRHA1 (X), however, indicated a 13.67% and 37.2% reduction in kappa number for pine and eucalypts kraft pulps, respectively. The results showed that delignification with the consecutive xylanase and lignin peroxidase treatment was very significant.
Antioxidant activity, sugar content and phenolic profiling of blueberries cultivars: A comprehensive comparison Onur Tolga OKAN, İlhan DENİZ, Nurettin YAYLI, İhsan Güngör ŞAT, Mehmet ÖZ, Gönül HATİPOĞLU SERDAR Notulae Botanicae Horti Agrobotanici Cluj Napoca, 2018 Commercial blueberry production has been a viable industry throughout the world for 95 years; because of blueberry is a good source of antioxidant. Blueberries are especially rich in anthocyanin, a flavonoid with potent antioxidant capacity. The aim of this study was to compare the phenolic quantities, antioxidant activities, anthocyanin, sugar and phenolic compounds of blueberries produced in Turkey with those of similar blueberry varieties produced around the world. As a result of the conducted analysis, the total phenolic content (TPC) amount found in the berries was 77.26-215.12 mg GAE/100 g, the total flavonoid content (TFC) was 30.44-91.69 mg QE/100 g and the total anthocyanin content (TAC) was 43.03-295.06 mg c3-GE/100 g. Examining the antioxidant activities of the berries, DPPH between 1.10-5.65 mg/ml, FRAP between 454.93-36832.96 µmol troloks/100 g, β-Carotene between 40.66-86.48%. It was determined that the natural berries contained much more phenolic compounds and higher antioxidant activity than that of the cultivars The result of HPLC analysis, chlorogenic acid is determined to be the dominant compound in all berries. Furthermore, fructose and glucose are found in all fruits in different quantities while sucrose is found in certain varieties of berries as well. At the end of the performed study the data indicate that wild and cultivars of blueberries are rich sources of antioxidants for local as well international industries importing this fruit for food processing and enormous products.
Kraft and modified kraft pulping of bamboo (Phyllostachys bambusoides) Ilhan DENiZ, Onur Tolga OKAN, Bedri SERDAR, Halil İbrahim ŞAHiN Drewno, 2017 Delignification of bamboo (Phyllostachys bambusoides) grown in the Eastern Black Sea region of Turkey was carried out by kraft, kraft-anthraquinone (AQ) and kraft-sodium borohydride (NaBH4) pulping under a variety of conditions to determine the effect of AQ, NaBH4 and cooking parameters on pulp and paper properties such as yield, kappa number, viscosity, and strength properties. The chemical composition and fibre dimensions of the cell wall of Phyllostachys bambusoides culm fibres were also investigated. The analysed data revealed the following optimum krafi pulping conditions: Active alkali, 16% (as Na2O); NaBH4, 0.3%; AQ, 0.1%; and cooking time, 90 min. The modified kraft method with 0.1% AQ was found to provide better pulp properties than those with 0.3% NaBH4. Increasing the thickness of chip used in cooking from 2.0 mm to 4.0 mm increase the yield. The optimum cooking conditions of Phyllostachys bambusoides modified krafi pulps were found to be: screened yield, 48.1%; reject ratio, 0.53%; kappa number; 24.1; viscosity, 1210 ml/g; breaking length, 6.05 kin; burst index, 5.08 kPa m(2)/g; tearing index, 4.99 mNm(2)/g; brightness 20.35%.
Biochemical Profiles of Three Bryophytes: Sphagnum papillosum, Rhytidiadelphus triquetrus, and Ditrichum gracile OT Okan, C Baltacı Chemistry & Biodiversity 23 (2) , 2026 2026
Phenolic and antioxidant assessment of the flowers, stems, leaves, and fruits of Rosa pimpinellifolia and Rosa canina at different growth time M Öz, OT Okan, C Baltaci Horticultural Science , 2026 2026
Chemical Constituents and Bioactivity Studies of Two Polytrichaceae Species, Polytrichum formosum Hedw. and Polytrichum commune Hedw. OT Okan BioResources 20 (1) , 2025 2025 Citations: 5
Physicochemical Properties, Antioxidant Capacity and Sensory Acceptability of Instant Rosehip Teas Prepared by Spray-Drying and Freeze-Drying Methods C Baltaci, DE Bostanci, R Altintaş, Y Dalkiran, A Akdoğan, OT OKAN Polish Journal of Food and Nutrition Sciences 74 (3), 244-254 , 2024 2024 Citations: 8
Evaluation of Antioxidant Properties of Wild and Cultivated Blueberry Leaves and Their Phenolic Compound OT Okan, E Ulusoy, M Öz, İ Deniz Kastamonu University Journal of Forestry Faculty 24 (2), 104-114 , 2024 2024 Citations: 2
Analysis of Essential Oil from Calendula arvensis L. (Field Marigold Flowers) O TOLGA OKAN Journal of Bartin Faculty of Forestry 26 (1), 13-20 , 2024 2024 Citations: 4
Antioxidant, Antimicrobial and Some Chemical Composition of Plagiochila asplenioides (L.) Dumort Extract OT Okan Anatolian Bryology 9 (1), 11-19 , 2023 2023 Citations: 5
Determination of the Chemical Composition, Antioxidant and Antimicrobial Activities of Different Parts of Rosa canina L. and Rosa pimpinellifolia L. Essential Oils M Öz, İ Deniz, OT Okan, C Baltacı, MS Karataş 24 3, 519-537 , 2021 2021 Citations: 20
Determination of the hardness and the parameters of the surface roughness in peach wood OT Okan, Ü Ayata Journal of Apitherapy and Nature 3 (2), 75-86 , 2020 2020 Citations: 2
Determination of chemical composition, antioxidant and antifungal properties of pomegranate (Punica granatum L.) and Parsley (Petroselinum crispum) seed oil produced in … OT Okan, A Kilic Pekgözlü, A Onaran, M Öz, I Deniz Artvin Coruh University Journal of Forestry Faculty 21 (2), 143-153 , 2020 2020 Citations: 16
Some Edible Forest Fruits Their In Vitro Antioxidant Activities, Phenolic Compounds And Some Enzyme Inhibition Effects OT Okan, H Serencam, N Baltaş, Z Can Fresenius Enviromental Bulletin 28 (8), 6090-6098 , 2019 2019 Citations: 23
Distinctive delignification with consecutive application of Geobacillus sp. 71 xylanase and Rhodococcus jostii rha1 lignin peroxidase A Ozer, S Canakci, G Gocmen, I Deniz, H Kirci, OT Okan, AO Belduz Maderas. Ciencia y tecnología 20 (3), 505-518 , 2018 2018 Citations: 4
An investigation on Trakya region Oak ( Quercus spp.) honeys of Turkey: their physico-chemical, antioxidant and phenolic compounds properties S Kolayli, Z Can, HE Çakir, OT Okan, O Yildiz Turkish Journal of Biochemistry 43 (4), 362-374 , 2018 2018 Citations: 58
Antioxidant Activity, Sugar Content and Phenolic Profiling of Blueberries Cultivars: A Comprehensive Comparison OT OKAN, İ DENİZ, N YAYLI, İG ŞAT, M ÖZ, GH SERDAR Notulae Botanicae Horti Agrobotanici Cluj-Napoca 46 (2) , 2018 2018 Citations: 107
Ekstraksiyon (Özütleme) Yöntemleri OT Okan 2018
Üniversite-Sanayi İş Birliği: Riskler, Fırsatlar ve Kimya Endüstrisi İçin Önemi OT Okan Turkchem, 12-20 , 2018 2018
Kraft and Modified Kraft Pulping of Bamboo (Phyllostachys Bambusoides) I Deniz, OT Okan, B Serdar, Hİ Şahin Drewno 200 (60), 79-94 , 2017 2017 Citations: 22
Doğu Karadeniz Bölgesinde yetişen doğal ve kültür maviyemiş meyve ve yapraklarının fenolik bileşik, şeker, antioksidan tayini ve maviyemiş meyve suyunun besinsel değeri OT Okan Karadeniz Teknik Üniversitesi. Türkiye: Doktora Tezi , 2016 2016 Citations: 3
Kimya Endustirisi Ar-Ge ile Yükselecek OT Okan Turkchem, 26-28 , 2016 2016
Production of Resin from Red Pine (Pinus brutia Ten.) and Maritima Pine (Pinus pinaster) with Acid Paste and Borehole Methods and Resin Amount Variation in Different Parts of … İ Deniz, İ Aydın, B Yılmaz, OT Okan European Non-Wood Forest Products (NWFPs) Network COST Action FP1203 4th … , 2016 2016
MOST CITED SCHOLAR PUBLICATIONS
Antioxidant Activity, Sugar Content and Phenolic Profiling of Blueberries Cultivars: A Comprehensive Comparison OT OKAN, İ DENİZ, N YAYLI, İG ŞAT, M ÖZ, GH SERDAR Notulae Botanicae Horti Agrobotanici Cluj-Napoca 46 (2) , 2018 2018 Citations: 107
Antioksidan Analiz Yöntemleri ve Doğu Karadeniz Bölgesinde Antioksidan KaynaĞı Olarak Kullanılabilecek Odun Dışı Bazı Bitkisel Ürünler. İD Onur Tolga OKAN, Hülya VARLIBAŞ, Mehmet ÖZ Kastamonu University Journal of Forestry Faculty , 2013 2013 Citations: 85
An investigation on Trakya region Oak ( Quercus spp.) honeys of Turkey: their physico-chemical, antioxidant and phenolic compounds properties S Kolayli, Z Can, HE Çakir, OT Okan, O Yildiz Turkish Journal of Biochemistry 43 (4), 362-374 , 2018 2018 Citations: 58
Wood surface protection against artificial weathering with vegetable seed oils O Ozgenc, OT Okan, UC Yildiz, I Deniz BioResources 8 (4), 6242-6262 , 2013 2013 Citations: 53
Comperation Of Pulping And Bleaching Behaviors Of Some Agricultural Residues S Ateş, İ Deniz, H Kirci, C Atik, OT Okan Turkish Journal of Agriculture and Forestry , 2014 2014 Citations: 52
Some Edible Forest Fruits Their In Vitro Antioxidant Activities, Phenolic Compounds And Some Enzyme Inhibition Effects OT Okan, H Serencam, N Baltaş, Z Can Fresenius Enviromental Bulletin 28 (8), 6090-6098 , 2019 2019 Citations: 23
Kraft and Modified Kraft Pulping of Bamboo (Phyllostachys Bambusoides) I Deniz, OT Okan, B Serdar, Hİ Şahin Drewno 200 (60), 79-94 , 2017 2017 Citations: 22
Determination of the Chemical Composition, Antioxidant and Antimicrobial Activities of Different Parts of Rosa canina L. and Rosa pimpinellifolia L. Essential Oils M Öz, İ Deniz, OT Okan, C Baltacı, MS Karataş 24 3, 519-537 , 2021 2021 Citations: 20
Bleaching of bamboo (Phyllostachys bambusoides) Kraft-AQ Pulp with sodium perborate tetrahydrate (SPBTH) after oxygen delignification O OKAN, I Deniz, I Yildirim BioResources 8 (1) , 2013 2013 Citations: 20
Application Of Artificial Neural Networks For Predicting Tensile Index And Brightness In Bleaching Pulp OT Okan, İ Deniz, S Tiryaki Maderas: Ciencia y Tecnología 17 (3), 571-584 , 2014 2014 Citations: 18
Wild edible mushrooms having an important potential in East Black Sea Region OT Okan, S Yıldız, A Yılmaz, J Barutçiyan, I Deniz International Caucasian forestry symposium, 24-26 , 2013 2013 Citations: 18
Determination of chemical composition, antioxidant and antifungal properties of pomegranate (Punica granatum L.) and Parsley (Petroselinum crispum) seed oil produced in … OT Okan, A Kilic Pekgözlü, A Onaran, M Öz, I Deniz Artvin Coruh University Journal of Forestry Faculty 21 (2), 143-153 , 2020 2020 Citations: 16
Chemical Composition of Oleoresin and Larvae Gallery Resin of Pinus Brutia Attacked by Dioryctria Slvestrella Ratz. M Öz, İ Deniz, OT Okan, MS Fidan DRVNA INDUSTRIJA, 179-188 , 2015 2015 Citations: 16
Prediction of non-wood forest products trade using artificial neural networks I Yildirim, S Ozsahin, OT Okan Journal of Agricultural Science and Technology 16, 1481-1492 , 2014 2014 Citations: 13
Physicochemical Properties, Antioxidant Capacity and Sensory Acceptability of Instant Rosehip Teas Prepared by Spray-Drying and Freeze-Drying Methods C Baltaci, DE Bostanci, R Altintaş, Y Dalkiran, A Akdoğan, OT OKAN Polish Journal of Food and Nutrition Sciences 74 (3), 244-254 , 2024 2024 Citations: 8
Effects of precipitated calcium carbonate (PCC) on optical properties of waste paper A Tutuş, M Çiçekler, A Özdemir, OT Okan International Caucasian Forestry Symposium, 884-887 , 2013 2013 Citations: 6
The use of some vegetable oils as wood finishing substances in furniture industry S Tiryaki, OT Okan, A Malkocoglu, I Deniz International Caucasian Forestry Symposium, 939-946 , 2013 2013 Citations: 6
Chemical Constituents and Bioactivity Studies of Two Polytrichaceae Species, Polytrichum formosum Hedw. and Polytrichum commune Hedw. OT Okan BioResources 20 (1) , 2025 2025 Citations: 5
Antioxidant, Antimicrobial and Some Chemical Composition of Plagiochila asplenioides (L.) Dumort Extract OT Okan Anatolian Bryology 9 (1), 11-19 , 2023 2023 Citations: 5
Analysis of Essential Oil from Calendula arvensis L. (Field Marigold Flowers) O TOLGA OKAN Journal of Bartin Faculty of Forestry 26 (1), 13-20 , 2024 2024 Citations: 4
