Prof. Dr. Ökkeş Yılmaz profile image
Prof. Dr. Ökkeş Yılmaz
Publication 30 Review 1 CrossRef Cited 38
30 Publication
1 Review
38 CrossRef Cited

Institution

Publications

Determination of Fatty Acid Composition in Muscle Tissues of Squalius semae Turan, Kottelat & Bayçelebi, 2017 in Kuzgun Dam (Erzurum)
Authors: Esin Özçiçek , Mehmet Kocabaş , Filiz Kutluyer Kocabaş , Görkem Kırmızıkaya Özmen , Ökkeş Yılmaz
Published: 2025 , Research in Agricultural Sciences
DOI: 10.17097/agricultureatauni.1506166
FAVORITE 0 TOTAL DOWNLOAD COUNT 616

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616

Alburnoides velioglui (Turan vd., 2014)’nin Yağ Asidi Profili: Pülümür Çayı (Tunceli) Örneği
Authors: Esin Özçiçek , Filiz Kutluyer Kocabaş , Mehmet Kocabaş , Görkem Kırmızıkaya Özmen , Prof. Dr. Ökkeş Yılmaz
Published: 2024 , Memba Kastamonu Üniversitesi Su Ürünleri Fakültesi Dergisi
DOI: 10.58626/menba.1542856
FAVORITE 0 TOTAL DOWNLOAD COUNT 270

0

270

Investigation of Flower, Leaf, and Stem Parts of Three Gundelia Species Growth in the Eastern Anatolia Region of Türkiye from a Biochemical Perspective
Authors: Fatih Yilmaz , İsmail Türkoğlu , Görkem Kırmızıkaya Özmen , Ebru Yüce-babacan , Prof. Dr. Ökkeş Yılmaz
Published: 2024 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1480388
FAVORITE 0 TOTAL DOWNLOAD COUNT 776

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776

In vitro antimicrobial, anticancer and antioxidant activities and bioactive contents of endemic Acanthus dioscoridis L. var. dioscoridis flowers from Türkiye
Authors: Serhat Keser , Omer Kaygılı , Suat Tekin , İsmail Türkoğlu , Prof. Dr. Ökkeş Yılmaz , Mustafa Karatepe , Sevda Kırbağ , Süleyman Sandal
Published: 2024 , Journal of Physical Chemistry and Functional Materials
DOI: 10.54565/jphcfum.1539481
FAVORITE 0 TOTAL DOWNLOAD COUNT 407

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407

A Biochemical Study on the Development of Actinidia deliciosa Callus by Combinations of Naphthalene Acetic Acid, 6-Benzylaminopurine and Indole-3-Butyric Acid
Authors: Aykut Topdemir , Tuba Okutan , Görkem Kırmızıkaya , Prof. Dr. Ökkeş Yılmaz
Published: 2024 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1281016
FAVORITE 0 TOTAL DOWNLOAD COUNT 1589

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1589

The Antioxidant Capacities and Antimicrobial Activities of Some Salvia L. Seeds
Authors: Murat Kürşat , Sevda Kırbağ , İrfan Emre , Pınar Erecevit Sönmez , Mustafa Yunus Emre , Prof. Dr. Ökkeş Yılmaz , Şemsettin Civelek
Published: 2023 , Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
DOI: 10.17798/bitlisfen.1312188
FAVORITE 0 TOTAL DOWNLOAD COUNT 495

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495

Responses of Saccharomyces cerevisiae Cells Grown in Cultures Prepared from Different Tea Infusions to Oxidative Stress
Authors: Görkem Kırmızıkaya , Tuba Okutan , Oğuz Ayhan Kireçci , Prof. Dr. Ökkeş Yılmaz
Published: 2023 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1221661
FAVORITE 0 TOTAL DOWNLOAD COUNT 1317

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1317

Antioxidant Effects of Some Phosphazene Derivatives in Saccharomyces cerevisiae L. Cell Culture Oxidative Stress Model
Authors: Ayşe Dilek Özşahin , Ayşe Erdoğdu , Oğuz Ayhan Kireçci , Fatih Aslan , Ali İhsan , Prof. Dr. Ökkeş Yılmaz
Published: 2023 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1051663
FAVORITE 0 TOTAL DOWNLOAD COUNT 1342

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1342

In vitro Antiradical, Antimicrobial, Anticancer, and Phytochemical Properties of Rumex acetosella L. (Sorrel)
Authors: Fatma Keser , Mustafa Karatepe , Serhat Keser , Suat Tekin , İsmail Türkoğlu , Omer Kaygılı , Ersin Demir , Prof. Dr. Ökkeş Yılmaz , Süleyman Sandal , Sevda Kırbağ
Published: 2022 , Bilecik Seyh Edebali University Journal of Science
DOI: 10.35193/bseufbd.994208
FAVORITE 0 TOTAL DOWNLOAD COUNT 1566

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1566

Effects of Pistacia terebinthus L. Subsp. palaestina and Rhus coriaria L. Plants on Some Biochemical Parameters of Brain Tissue of Sprague-Dawley Rats in Experimental Breast Cancer Model
Authors: Figen Erdem Erişir , Oğuz Ayhan Kireçci , Ayşe Dilek Özşahin , Prof. Dr. Ökkeş Yılmaz
Published: 2022 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1074615
FAVORITE 0 TOTAL DOWNLOAD COUNT 1699

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1699

In vitro anticancer, antimicrobial and antiradical properties and bioactive compounds of endemic Wiedemannia orientalis Fisch. & Mey. flowers
Authors: Serhat Keser , Fatma Keser , Suat Tekin , İsmail Türkoğlu , Omer Kaygılı , Ersin Demir , Prof. Dr. Ökkeş Yılmaz , Süleyman Sandal , Sevda Kırbağ , Mustafa Karatepe
Published: 2022 , Journal of Physical Chemistry and Functional Materials
DOI: 10.54565/jphcfum.1192938
FAVORITE 0 TOTAL DOWNLOAD COUNT 430

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430

The Biochemical Properties of Some Species of Dicranum Hedw.
Authors: Mustafa Demirbağ , Vesile Yıldırım , Nevzat Batan , Prof. Dr. Ökkeş Yılmaz , İrfan Emre , Mevlüt Alataş
Published: 2022 , Anatolian Bryology
DOI: 10.26672/anatolianbryology.1205930
FAVORITE 0 TOTAL DOWNLOAD COUNT 1162

0

1162

In vitro Bioactive and Phytochemical Properties of Malva neglecta Wallr. (Mallow)
Authors: Fatma Keser , Mustafa Karatepe , Serhat Keser , Suat Tekin , İsmail Türkoğlu , Omer Kaygili , Ersin Demir , Prof. Dr. Ökkeş Yılmaz , Süleyman Sandal , Sevda Kırbag
Published: 2022 , Duzce University Journal of Science and Technology
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 994

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994

Determination of Biochemical Activities of Aromatic Cyclic Phosphatans in the Culture of Saccharomyces cerevisiae L.
Authors: Ayşe Dilek Özşahin , Ayşe Erdoğdu , Oğuz Ayhan Kireçci , Prof. Dr. Ökkeş Yılmaz
Published: 2022 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.908393
FAVORITE 0 TOTAL DOWNLOAD COUNT 1649

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1649

In vitro Biological Activities and Phytochemical Contents of Portulaca oleracea L. (Purslane)
Authors: Fatma Keser , Mustafa Karatepe , Serhat Keser , Suat Tekin , İsmail Türkoğlu , Omer Kaygili , Ersin Demir , Prof. Dr. Ökkeş Yılmaz , Süleyman Sandal , Sevda Kırbag
Published: 2021 , Journal of Physical Chemistry and Functional Materials
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 897

0

897

The Antioxidant and Antimicrobial Capacities of Phenolic Profiles of Some Salvia L. Seeds Grown in Turkey
Authors: İrfan Emre , Murat Kurşat , Sevda Kırbag , Pınar Erecevit Sönmez , Mustafa Yunus Emre , Prof. Dr. Ökkeş Yılmaz , Şemsettin Civelek
Published: 2021 , International Journal of Secondary Metabolite
DOI: 10.21448/ijsm.780232
FAVORITE 0 TOTAL DOWNLOAD COUNT 1023

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1023

Effects of Cyclophosphazene Derivatives on Malondialdehyde, Glutathione and Total Protein Content in Yeast Culture Media
Authors: Ayşe Dilek Özşahin , Derya Beşer, Ali İhsan Öztürk , Fatih Aslan , Ökkeş Yılmaz
Published: 2020 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.600569
FAVORITE 0 TOTAL DOWNLOAD COUNT 2369

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2369

The Effect of Aqueous Extract of Pine Kindling on the Liver and Kidney Tissues of Diabetic Rats
Authors: Ersin Demir , Ökkeş Yılmaz , Halise Sarıgül
Published: 2020 , Hacettepe Journal of Biology and Chemistry
DOI: 10.15671/hjbc.568920
FAVORITE 0 TOTAL DOWNLOAD COUNT 1621

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1621

In Vitro Biological Evaluation and Phytochemical Contents of Three Centaurea L. Species Growing from Eastern Anatolia in Turkey
Authors: Serhat Keser , Fatma Keser, İsmail Turkoglu , Omer Kaygılı , Suat Tekın, Ersin Demır , Mustafa Karatepe , Okkes Yılmaz , Sevda Kırbag , Suleyman Sandal , Semra Turkoglu
Published: 2020 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.589279
FAVORITE 0 TOTAL DOWNLOAD COUNT 3123

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3123

In vitro Antiradical, Antimicrobial and Antiproliferative Activities and Phytochemical Compositions of Endemic Alcea calvertii (Boiss) Boiss. Flowers
Authors: Serhat Keser , Fatma Keser, Suat Tekın, Ömer Kaygılı , İsmail Turkoglu , Ersin Demır , Mustafa Karatepe , Sevda Kırbag , Ökkes Yılmaz , Suleyman Sandal , Semra Turkoglu
Published: 2020 , Duzce University Journal of Science and Technology
DOI: 10.29130/dubited.595147
FAVORITE 0 TOTAL DOWNLOAD COUNT 1123

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1123

Effect of vanillic acid against oxidative stress induced by glyphosate in Saccharomyces cerevisiae
Authors: Gözde Özcan, Ersin Demir , Prof. Dr. Ökkeş Yılmaz , Figen Erdem Erişir, Hatayi Zengin
Published: 2019 , Biological Diversity and Conservation
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 504

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504

Assessment of vitamin compositions and cholesterol levels of carp (Cyprinus carpio carpio) and rainbow trout (Oncorhynchus mykiss) caviars
Authors: Ayşe Gürel İnanlı , Özlem Emir Çoban , Ökkeş Yılmaz , Emine Özpolat, Nermin Karaton Kuzgun
Published: 2019 , Ege Journal of Fisheries and Aquatic Sciences
DOI: 10.12714/egejfas.2019.36.3.10
FAVORITE 0 TOTAL DOWNLOAD COUNT 2537

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2537

The Lipide Soluble Vitamin Contents of Some Onobrychis Miller Taxa
Authors: İrfan Emre , Hakan Sepet , Murat Kürşat , Muammer Bahşi , Ökkeş Yılmaz , Ahmet Şahin
Published: 2019 , Artvin Coruh University Journal of Forestry Faculty
DOI: 10.17474/artvinofd.555426
FAVORITE 0 TOTAL DOWNLOAD COUNT 2351

0

2351

The lipid-soluble vitamins contents of some Vicia L. species by using HPLC
Authors: İrfan Emre , Muammer Bahşi, Hasan Genç , Ökkeş Yılmaz , Ahmet Şahin
Published: 2019 , International Journal of Secondary Metabolite
DOI: 10.21448/ijsm.512335
FAVORITE 0 TOTAL DOWNLOAD COUNT 1181

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1181

The Lipide- Soluble Vitamin Contents Of Some Astragalus Taxa By Using HPLC
Authors: Muammer Bahşi , Murat Kürşat , İrfan Emre , Ökkeş Yılmaz
Published: 2019 , Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
DOI: 10.17798/bitlisfen.508433
FAVORITE 0 TOTAL DOWNLOAD COUNT 1177

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1177

The Lipide-Soluble Vitamin Contents Of Some Lathyrus Species
Authors: Muammer Bahşi , İrfan Emre , Hasan Genç , Ahmet Şahin , Ökkeş Yılmaz
Published: 2019 , Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
DOI: 10.17798/bitlisfen.508197
FAVORITE 0 TOTAL DOWNLOAD COUNT 1113

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1113

Sulu Çam Çıra Ekstresinin Diyabet Oluşturulan Sıçanların Testis Dokusu Üzerindeki Etkisi
Authors: Ersin Demir , Ökkeş Yılmaz , Halise Sarıgül
Published: 2018 , Süleyman Demirel University Journal of Natural and Applied Sciences
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 4755

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4755

Linalool Sıçan Karaciğer ve Böbreklerindeki Bazı Doymamış Yağ Asit Değerlerini FeCl2 Hasarından Korumaktadır
Authors: Alpaslan Dayangaç , Ahmet Özkaya , Muammer Bahşi , Harun Çiftçi, Gülender Akyıldız, Ökkeş Yılmaz
Published: 2011 , Journal of Duzce University Health Sciences Institute
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 2742

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2742

VİTAMİN C-6 PALMİTAT (VC6P)’IN AĞIR METAL UYGULAMASINDA SIÇANLARIN BAZI DOKULARINDAKİ YAĞ ASİT DEĞERLERİNE ETKİSİ
Authors: Alpaslan Dayangaç , Ökkeş Yılmaz
Published: 2006 , Fırat Üniversitesi Doğu Araştırmaları Dergisi
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 374

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374

SIÇANLARIN BAZI DOKULARINDAKİ YAĞ ASİDİ KOMPOZİSYONUNA KADMİYUMUN ETKİLERİ
Authors: Alpaslan Dayangaç , Mahmut Yılmaz, Vahit Konar, Ökkeş Yılmaz
Published: 2006 , Fırat Üniversitesi Doğu Araştırmaları Dergisi
DOI: -
FAVORITE 0 TOTAL DOWNLOAD COUNT 356

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356

Articles published in
Anatolian Bryology
Anatolian Bryology
Artvin Coruh University Journal of Forestry Faculty
Artvin Coruh University Journal of Forestry Faculty
Bilecik Seyh Edebali University Journal of Science
Bilecik Seyh Edebali University Journal of Science
Biological Diversity and Conservation
Biological Diversity and Conservation
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
Bitlis Eren Üniversitesi Fen Bilimleri Dergisi
Duzce University Journal of Science and Technology
Duzce University Journal of Science and Technology
Ege Journal of Fisheries and Aquatic Sciences
Ege Journal of Fisheries and Aquatic Sciences
Fırat Üniversitesi Doğu Araştırmaları Dergisi
Fırat Üniversitesi Doğu Araştırmaları Dergisi
Hacettepe Journal of Biology and Chemistry
Hacettepe Journal of Biology and Chemistry
International Journal of Secondary Metabolite
International Journal of Secondary Metabolite
Journal Of Agriculture and Nature
Journal Of Agriculture and Nature
Journal of Duzce University Health Sciences Institute
Journal of Duzce University Health Sciences Institute
Journal of Physical Chemistry and Functional Materials
Journal of Physical Chemistry and Functional Materials
Memba Kastamonu Üniversitesi Su Ürünleri Fakültesi Dergisi
Memba Kastamonu Üniversitesi Su Ürünleri Fakültesi Dergisi
Research in Agricultural Sciences
Research in Agricultural Sciences
Süleyman Demirel University Journal of Natural and Applied Sciences
Süleyman Demirel University Journal of Natural and Applied Sciences

Reviews

Journal Of Agriculture and Nature
Journal Of Agriculture and Nature

Publications

Alburnoides velioglui (Turan vd., 2014)’nin Yağ Asidi Profili: Pülümür Çayı (Tunceli) Örneği
Authors: Esin Özçiçek , Filiz Kutluyer Kocabaş , Mehmet Kocabaş , Görkem Kırmızıkaya Özmen , Prof. Dr. Ökkeş Yılmaz
Published: 2024 , Memba Kastamonu Üniversitesi Su Ürünleri Fakültesi Dergisi
DOI: 10.58626/menba.1542856
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 270

1

0

270

Investigation of Flower, Leaf, and Stem Parts of Three Gundelia Species Growth in the Eastern Anatolia Region of Türkiye from a Biochemical Perspective
Authors: Fatih Yilmaz , İsmail Türkoğlu , Görkem Kırmızıkaya Özmen , Ebru Yüce-babacan , Prof. Dr. Ökkeş Yılmaz
Published: 2024 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1480388
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 776

1

0

776

A Biochemical Study on the Development of Actinidia deliciosa Callus by Combinations of Naphthalene Acetic Acid, 6-Benzylaminopurine and Indole-3-Butyric Acid
Authors: Aykut Topdemir , Tuba Okutan , Görkem Kırmızıkaya , Prof. Dr. Ökkeş Yılmaz
Published: 2024 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1281016
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 1589

1

0

1589

In vitro Antiradical, Antimicrobial, Anticancer, and Phytochemical Properties of Rumex acetosella L. (Sorrel)
Authors: Fatma Keser , Mustafa Karatepe , Serhat Keser , Suat Tekin , İsmail Türkoğlu , Omer Kaygılı , Ersin Demir , Prof. Dr. Ökkeş Yılmaz , Süleyman Sandal , Sevda Kırbağ
Published: 2022 , Bilecik Seyh Edebali University Journal of Science
DOI: 10.35193/bseufbd.994208
CITED 4 FAVORITE 0 TOTAL DOWNLOAD COUNT 1566

4

0

1566

Effects of Pistacia terebinthus L. Subsp. palaestina and Rhus coriaria L. Plants on Some Biochemical Parameters of Brain Tissue of Sprague-Dawley Rats in Experimental Breast Cancer Model
Authors: Figen Erdem Erişir , Oğuz Ayhan Kireçci , Ayşe Dilek Özşahin , Prof. Dr. Ökkeş Yılmaz
Published: 2022 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.1074615
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 1699

1

0

1699

The Biochemical Properties of Some Species of Dicranum Hedw.
Authors: Mustafa Demirbağ , Vesile Yıldırım , Nevzat Batan , Prof. Dr. Ökkeş Yılmaz , İrfan Emre , Mevlüt Alataş
Published: 2022 , Anatolian Bryology
DOI: 10.26672/anatolianbryology.1205930
CITED 4 FAVORITE 0 TOTAL DOWNLOAD COUNT 1162

4

0

1162

Determination of Biochemical Activities of Aromatic Cyclic Phosphatans in the Culture of Saccharomyces cerevisiae L.
Authors: Ayşe Dilek Özşahin , Ayşe Erdoğdu , Oğuz Ayhan Kireçci , Prof. Dr. Ökkeş Yılmaz
Published: 2022 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.908393
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 1649

1

0

1649

The Antioxidant and Antimicrobial Capacities of Phenolic Profiles of Some Salvia L. Seeds Grown in Turkey
Authors: İrfan Emre , Murat Kurşat , Sevda Kırbag , Pınar Erecevit Sönmez , Mustafa Yunus Emre , Prof. Dr. Ökkeş Yılmaz , Şemsettin Civelek
Published: 2021 , International Journal of Secondary Metabolite
DOI: 10.21448/ijsm.780232
CITED 5 FAVORITE 0 TOTAL DOWNLOAD COUNT 1023

5

0

1023

Effects of Cyclophosphazene Derivatives on Malondialdehyde, Glutathione and Total Protein Content in Yeast Culture Media
Authors: Ayşe Dilek Özşahin , Derya Beşer, Ali İhsan Öztürk , Fatih Aslan , Ökkeş Yılmaz
Published: 2020 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.600569
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 2369

1

0

2369

In Vitro Biological Evaluation and Phytochemical Contents of Three Centaurea L. Species Growing from Eastern Anatolia in Turkey
Authors: Serhat Keser , Fatma Keser, İsmail Turkoglu , Omer Kaygılı , Suat Tekın, Ersin Demır , Mustafa Karatepe , Okkes Yılmaz , Sevda Kırbag , Suleyman Sandal , Semra Turkoglu
Published: 2020 , Journal Of Agriculture and Nature
DOI: 10.18016/ksutarimdoga.vi.589279
CITED 9 FAVORITE 0 TOTAL DOWNLOAD COUNT 3123

9

0

3123

In vitro Antiradical, Antimicrobial and Antiproliferative Activities and Phytochemical Compositions of Endemic Alcea calvertii (Boiss) Boiss. Flowers
Authors: Serhat Keser , Fatma Keser, Suat Tekın, Ömer Kaygılı , İsmail Turkoglu , Ersin Demır , Mustafa Karatepe , Sevda Kırbag , Ökkes Yılmaz , Suleyman Sandal , Semra Turkoglu
Published: 2020 , Duzce University Journal of Science and Technology
DOI: 10.29130/dubited.595147
CITED 3 FAVORITE 0 TOTAL DOWNLOAD COUNT 1123

3

0

1123

Assessment of vitamin compositions and cholesterol levels of carp (Cyprinus carpio carpio) and rainbow trout (Oncorhynchus mykiss) caviars
Authors: Ayşe Gürel İnanlı , Özlem Emir Çoban , Ökkeş Yılmaz , Emine Özpolat, Nermin Karaton Kuzgun
Published: 2019 , Ege Journal of Fisheries and Aquatic Sciences
DOI: 10.12714/egejfas.2019.36.3.10
CITED 4 FAVORITE 0 TOTAL DOWNLOAD COUNT 2537

4

0

2537

The Lipide Soluble Vitamin Contents of Some Onobrychis Miller Taxa
Authors: İrfan Emre , Hakan Sepet , Murat Kürşat , Muammer Bahşi , Ökkeş Yılmaz , Ahmet Şahin
Published: 2019 , Artvin Coruh University Journal of Forestry Faculty
DOI: 10.17474/artvinofd.555426
CITED 2 FAVORITE 0 TOTAL DOWNLOAD COUNT 2351

2

0

2351

The lipid-soluble vitamins contents of some Vicia L. species by using HPLC
Authors: İrfan Emre , Muammer Bahşi, Hasan Genç , Ökkeş Yılmaz , Ahmet Şahin
Published: 2019 , International Journal of Secondary Metabolite
DOI: 10.21448/ijsm.512335
CITED 1 FAVORITE 0 TOTAL DOWNLOAD COUNT 1181

1

0

1181

Popular Publications: It is determined automatically by the researchers doing research in DergiPark according to the statistics of being added to the favorites. CrossRef Cited: The citations shown in DergiPark are drawn from CrossRef. For this, the cited and cited articles must be registered in CrossRef (DOI number). ^: Citation numbers are reflected in the system by DergiPark at certain periods.