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Öğe A new species from Central Anatolia Turkey : Verbascum aydogdui Scrophulariaceae(Ali Nihat Gökyiğit Eğitim, Sağlık, Kültür, Sanat ve Doğal Varlıkları Koruma Vakfı, 2014) Karavelioğulları, Faik Ahmet; Vural, Mecit; Şahin, Bilal; Aslan, SerdarVerbascum aydogdui Karavel., Vural, B. Şahin & Aslan sp. nova Sect. Bothrosperma Murb. , is described for the first time as a new species to science in the location of Central Anatolia, Turkey. Besides to description of the new species, such as a description, scanning photograph of the type specimen, an illustration of the flower, some information on the ecology of the species and red list assessment, related with the identification are provided. In addition, diagnostic morphological characters of this new species and similar species [V. pumilum Boiss. & Heldr. güdük sığırkuyruğu ] are compared and detailed distribution maps of those species are also suppliedÖğe Bellevalia chrisii sp nov (Asparagaceae) from eastern Anatolia, Turkey(Wiley-Blackwell, 2015) Yıldırım, Hasan; Altıoğlu, Yusuf; Şahin, Bilal; Aslan, SerdarBellevalia chrisii Yldrm & B. Sahin (Asparagaceae) is described and illustrated as a new species from the Malatya province in eastern Anatolia, Turkey. Diagnostic morphological characters, a full description and detailed illustrations are provided on the basis of the type specimen and observations of wild populations. It is morphologically similar to B. rixii and B. crassa but is easily differentiated from both by more numerous and wider leaves, more numerous flowers, less dense fruiting raceme, longer fruiting pedicel and by the shape of the capsule. Moreover, it differs from B. crassa by crimson purple perigone and violaceous anthers. Also, it displays some similarities with B. glauca and has previously been confused with it, although it can be easily distinguished by several morphological features.The conservation status, a distribution map and notes on the biogeography and ecology of B. chrisii are provided.Öğe Bellevalia vuralii B. Sahin & Aslan (Asparagaceae): a new species from SE Turkey(Tubitak Scientific & Technical Research Council Turkey, 2016) Şahin, Bilal; Aslan, Serdar; Karabacak, Osman; Martin, EsraBellevalia vuralii B. Sahin & Aslan is described as a new species of Bellevalia from southeast Turkey. As well as its morphological characteristics and classification with regards to sections, its description, ecology, and relationship with related species are presented and discussed. The somatic chromosome number of these species was defined to be 2n = 8.Öğe Bellevalia vuralii B.Şahin & Aslan (Asparagaceae): a new species from SE Turkey(2016) Şahin, Bilal; Aslan, Serdar; Karabacak, Osman; Martin, EsraBellevalia vuralii B.Şahin & Aslan is described as a new species of Bellevalia from southeast Turkey. As well as its morphological characteristics and classification with regards to sections, its description, ecology, and relationship with related species are presented and discussed. The somatic chromosome number of these species was defined to be 2n 8.Öğe Çankırı İli Meralarının Floristik Özellikleri(2015) Şahin, Bilal; Aslan, Serdar; Ünal, Sabahaddin; Mutlu, Ziya; Mermer, Ali; Urla, Öztekin; Aydoğmuş, OsmanBu çalışmada, Çankırıda yapılan 41 adet mera vejetasyon etüdüne dayalı olarak il meralarının floristik özellikleri incelenmiştir. Vejetasyon etüdü tekerlek-nokta yöntemiyle yapılmıştır. Çalışma sonucunda 46 familya ve 187 cins içinde 327 adet tür tespit edilmiştir. Bu türlerin 38 tanesi buğdaygil, 56 tanesi baklagil, 47 tanesi papatyagil ve 141 tanesi de diğer familyalara aittir. Bitkiyle kaplı alan içerisinde buğdaygil, baklagil ve diğer familyaya ait türler sırayla %36.3, %12.8 ve %50.9 oranlarında bulunmaktadırlar. Yine meralarda en sık rastlanan familyalar sırasıyla Poaceae (3880), Lamiaceae (1676), Fabaceae (1367) ve Asteraceae (802)dir. En yüksek örtüşe sahip 20 türün 10u Poaceae, 1i Fabaceae ve 9u diğer familyalardandır. Meralardaki örnekleme başına ortalama tür sayısı 31.4 (standart sapma8)tür. Meralarda en çok rastlanan cinsler Astragalus (19), Trifolium (7), Centaurea (7), Alyssum (7), Trigonella (5), Ranunculus (5) ve Medicago (5)dur. Çankırı ilinin zengin flora yapısı mera alanlarının ıslahında kullanılabilecek yem bitkilerini içeren önemli bir bitki gen kaynağı olarak belirlenmiştir. Anahtar Kelimeler: Çankırı, mera, floraÖğe A contribution of enigmatic species to Smyrnium galaticum from Turkey(2013) Sağıroğlu, Mehmet; Aslan, Serdar; Şahin, BilalSmyrnium galaticum Czeczott ilk olarak Kuzey Anadolu Çankırı-Eldivan çevresinden Czeczott tarafından toplandı. Türkiye florası hazırlanırken P.F. Stevens tarafından bu tür iyi bilinmeyen türler arasına kondu ve tür ayırım anahtarında yer almadı. Bu makalede türün morfolojik karakterleri tartışıldı. İlave olarak türün tanımı genişletildi, ekolojisi, koruma statusü, S. cordifolium’dan farkları ve merikarplarının fotoğrafları verildi.Öğe Crocus thracicus (Iridaceae), a new species from north-western Turkey(Magnolia Press, 2015) Yüzbaşıoğlu, Sırrı; Aslan, Serdar; Özhatay, NerimanCrocus thracicus is described as a new species from Thrace, the European part of Turkey. The white form of this species was wrongly referred to an albino form of C. chrysanthus by Mathew in the Flora of Turkey. It grows in open stony places and in sparse Quercus sp. and Paliurus spina-christi clearings at elevations between 45-170 m. It is compared with the morphologically similar C. alexandri and C. weldenii. A description, detailed illustrations, photograps of metephase plate, karyotype and idiogram of new species are presented.Öğe Effect of CTAB concentration in the electrolyte on the tribological properties of nanoparticle SiC reinforced Ni metal matrix composite (MMC) coatings produced by electrodeposition(Elsevier, 2013) Kılıç, Fatih; Gül, Harun; Aslan, Serdar; Alp, A.; Akbulut, HatemIn this study, a nickel sulfate bath containing SiC nanoparticles (between 100 and 1000 nm) was used to obtain hard and wear-resistant nanoparticle reinforced Ni-SiC MMCs on steel surfaces for anti-wear applications, such as dies, tools and working parts. The influence of stirring speed and surfactant concentration on particle distribution, microhardness and wear resistance of nano-composite coatings has been studied. The nickel films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The depositions were controlled to obtain a specific thickness (between 50 and 200 mu m) and particle volume fraction in the matrix (between 0.02 and 0.12). The hardness of the resulting coatings was also measured and found to be 280-571 Hv, depending on the particle volume in the Ni matrix. The effects of the surfactant on the zeta potential, co-deposition and distribution of SiC particles in the nickel matrix, as well as the tribological properties of composite coatings, were investigated. The tribological behaviors of the electrodeposited SiC nano composite coatings sliding against M50 steel ball (empty set 10 mm) were examined on a CSM Instrument. All friction and wear tests were performed without lubrication at room temperature and in the ambient air (relative humidity 55-65 %). The results showed that the wear resistance of the nano composites was approximately 2-2.2 times higher than unreinforced Ni deposited material. (c) 2012 Elsevier B.V. All rights reserved.Öğe Effect of particle concentration on the structure and tribological properties of submicron particle SiC reinforced Ni metal matrix composite (MMC) coatings produced by electrodeposition(Elsevier Science Bv, 2012) Gül, Harun; Kılıç, Fatih; Uysal, Mehmet; Aslan, Serdar; Alp, A.; Akbulut, HatemIn the present work, a nickel sulfate bath containing SiC submicron particles between 100 and 1000 nm was used as the plating electrolyte. The aim of this work is to obtain Ni-SiC metal matrix composites (MMCs) reinforced with submicron particles on steel surfaces with high hardness and wear resistance for using in anti-wear applications such as dies, tools and working parts for automobiles and vehicles. The influence of the SiC content in the electrolyte on particle distribution, microhardness and wear resistance of nano-composite coatings was studied. During the electroplating process, the proper stirring speed was also determined for sub-micron SiC deposition with Ni matrix. The Ni films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The depositions were controlled to obtain a specific thickness (between 50 and 200 mu m) and volume fraction of the particles in the matrix (between 0.02 and 0.10). The hardness of the coatings was measured to be 280-571 HV depending on the particle volume in the Ni matrix. The tribological behaviors of the electrodeposited SiC nanocomposite coatings sliding against an M50 steel ball (empty set 10 mm) were examined on a tribometer. All the friction and wear tests were performed without lubrication at room temperature and in the ambient air (with a relative humidity of 55-65%). The results showed that the wear resistance of the nanocomposites was approximately 2-2.2 times more than those of unreinforced Ni. (C) 2011 Elsevier B.V. All rights reserved.Öğe Effect of reciprocating sliding speed on the tribological performance of nano SiCp reinforced Ni-metal matrix composites produced by electrocodeposition(2012) Gül, Harun; Akbulut, Hatem; Aslan, Serdar; Alp, A.In the present work, Ni/SiC metal matrix composite (MMC) coatings were prepared from a modified Watt's type electrolyte containing nano-SiC particles by direct current (DC) plating method to increase wear resistance of the electro co-deposited Ni. SiC nano particles with average particle size of 0, 1-1 ?m were co-deposited with nickel matrix on the steel substrates. For this purpose, several studies were carried out to optimize deposition parameters for specific applications. The depositions were controlled to obtain the specific thickness (between 175-200 ?m) and particle volume fraction in the matrix (between 0.03 and 0.10). The hardness of the resultant coatings was measured and found to be 280-571 HV depending on the particle concentration in the electrolyte and therefore, particle volume in the Ni matrix. The tribological tests were performed by a reciprocating ball-on disk apparatus sliding against M50 steel ball (ø10 mm). All the friction and wear tests were performed under the unlubricated conditions at room temperature and in the ambient air (relative humidity 55-65%). The wear tests were carried out at different sliding velocities of 50 mm/s, 100 mm/s and 150 mm/s by using a constant dead load of 1.0 N. It was detected that increasing sliding speed resulted to increase wear rate but decreasing friction coefficient due to change in wear mechanism. Increasing sliding speed showed formation of tribo induced oxides up to 20 g/l SiCp in the electrolyte and wear mechanism was controlled by temperature induced fatigue wear. Further increase in the SiCp in the electrolyte caused an abrasive type of the wear. Copyright © 2012 American Scientific Publishers All rights reserved.Öğe Gagea minima L. Ker Gawl. Liliaceae : New record for Turkey(Ali Nihat Gökyiğit Eğitim, Sağlık, Kültür, Sanat ve Doğal Varlıkları Koruma Vakfı, 2015) Tekşen, Mehtap; Eker, İsmail; Aslan, SerdarGagea minima L. Ker Gawl. is recorded for the first time based on the samples collected from Güzeldere Pass between Başkale and Van in Turkey. This species is close to G. confusa A. Terracc. that is one of the members of the section Minimae. The descriptions of the two species in the same section, their taxonomic relationships, geographic distributions, photos and anatomical features are comparatively given with this studyÖğe Improvement possibilities and effects of vegetation subjected to long-term Heavy Grazing in the steppe rangelands of Sivas(2014) Ünal, Sabahaddin; Mutlu, Ziya; Urla, Öztekin; Yıldız, Hakan; Aydoğdu, Metin; Şahin, Bilal; Aslan, SerdarMeralar gerçekte hayvanlar içi n yem kaynakları olarak bilinirler. Ayn ı zamand a meralar, s u kaynağ ı , zengi n flora ve fauna olma özelliği ve dinlenme alanı gibi çok yönlü kullanımlar için potansiyel kaynaklara sahipti r. Meralar uzun süreli optimum fayda sağlamak için dikkatli kullanılmalı ve muhafaza edilmelidirler. Bu alanlar hala kötü yönetim nedeniyle bozulmakta ve bu bozulma süreci devam etmektedi r. Mevcut mera durumu iyi yönetim uygulamalarıyla tersine çevrilebili r. Bu sebeple Sivas ili meralarında 2008, 2009 ve 2010 yıllarında arazi çalışmaları yürütülmüştü r. Vejetasyon etüt çalışmaları lup ile modifiye edilmiş tekerlek nokta yöntemi il e Sivas meraların ı temsi l eden 103 durakta yapılmıştı r. Bu çalışmanı n sonucund a bitkiyl e kapl ı alan % 60,68 olarak bulunmuştu r. Azalıc ı v e çoğalıc ı bitki türlerini n kaplam a oranları sırayl a % 15,53 v e % 22,23 tü r. İncelenen mera duraklarında iyi, orta ve zayıf durumda olan duraklar sırayla 6, 62 ve 35 olarak bulunmuştu r. Toplam durakların 97 adeti mera durumu orta ve zayıf sınıflamada yer almıştı r. Diğer taraftan, mera sağlığı açısından yapılan sınıflamada 26 durak sağlıklı, 35 durak riskli, 42 durak sorunlu olarak bulunmuştu r. Toplam 77 adet durak mera sağlığ ı açısından riskl i v e sorunludu r. Çalışm a sonuçları , meraları n yavaş olarak bozulm a eğiliminde olduğunu ve bu alanların uygun ıslah ve yönetim uygulamaları ile başarılı olarak orijinal hallerine dönme potansiyeli taşıdığını, göstermişti r.Öğe Liver Transplantation in a Patient with Absent Inferior Vena Cava: Case Report(2020) Dönmez, Ramazan; Kargı, Ahmet; Yazar, Şerafettin; Aslan, Serdar; Peker, Kemal; Polat, Kamil YalçınTransplantation procedure used if the recipient and donor do not have a special anatomicalvariation today; left lateral segment in the pediatric age group, and right lobe in the adult agegroup. Biliary atresia in children and various liver diseases like metabolic events in adults arethe major causes of liver transplantation. Liver transplantation is challenging in the patientswith congenital vascular anomalies. Infrahepatic interruption of the inferior vena cava (IVC)is a rare congenital anomaly with the incidence of 0.6% to 2% and mostly found withcongenital heart disease. In this study we tried to report a 58-year old male patient with adiagnosis of decompensated liver cirrhosis caused by the hepatitis B virus (HBV) who washospitalized for the first time for living donor liver transplantation.Öğe Modern Sayısal Herbaryumlar İçin Öne Çıkan Bir Model: Düzce Üniversitesi Orman Fakültesi (DUOF) Sanal Herbaryumu(Düzce Üniversitesi, 2024) Aslan, Serdar; Aydınkal, Rasim Murat; Aksoy, Necmi; Güneş Özkan, NevalDünyadaki büyük doğa tarihi müzeleri, milli herbaryumlar ve üniversitelere bağlı herbaryumlar çalışmaları kolaylaştırmak ve salgın hastalık veya uzak mesafelere örnek gönderiminin zorluğu gibi durumlarda erişimi kolaylaştırmak için mevcut örneklerini sayısallaştırmaya başlamışlardır. Türkiye’de 65 herbaryuma ait yaklaşık 1 milyondan fazla örnek bulunmaktadır. Fakat bu herbaryumların yaklaşık 10 tanesi veritabanına kayıtlarını girmiş durumdadır. Bunların da yaklaşık 5 tanesi örneklerini kısmen veya tamamen sayısallaştırmış durumdadır. DUOF Herbaryumu’nda 2009 yılında, veri girişi yalnızca örnek etiketi veri girişini içeriyordu. 2013 yılında örnek görüntü tarama işlemine başlanmıştır. Bu zamana kadar yaklaşık 11000 örneğe ait görüntü taranmıştır. Bu görüntüler ve veriler Zoomify ve OtoburTM programı aracılığı ile, DUOF Sanal Herbaryum'u veb sitesinde sunulmaktadır.Öğe Nadir Endemik Bir Tür Üzerine Notlar: Rhaponticoides pythiae (Azn. & Bornm.) M.V.Agab. & Greuter / Yitiktülüşah(2019) Sağıroğlu, Mehmet; Aslan, Serdar; Vural, MecitG.V. Aznavour tarafından Yalova’dan toplanan örneklere dayalı olarak bilim dünyasınaCentaurea pythiae olarak tanıtılan takson Türkiye Florası yazılırken, Centaurea amasiensisaltında sinonim olarak verilmiştir. Daha sonra ise bu tür yeniden canlandırılıpRhaponticoides pythiae olarak yeniden değerlendirilmiştir. Bu tür günümüze kadar uzun birsüre aranmış, ancak bir flora çalışması sırasında 2010 yılında yeniden toplanmıştır. Kocaeli,Safiye Köyü’nde çok kısıtlı bir alanda yetişen bu türün tehdit kategorisi CR (B2ab(i,ii,iii)olarak önerilmiştir.Öğe A new record for Turkey: Michauxia nuda A.DC. (Campanulaceae)(Tubitak Scientific & Technical Research Council Turkey, 2010) Aslan, Serdar; Vural, Mecit; Şahin, Bilal; Ergin, Esra; Kaya, Ömer FarukMichauxia nuda A.DC. (Campanulaceae) is recorded for the first time (C8 Siirt province) from Turkey. The diagnostic characters of M. nuda are described and its habitat and conservation status are indicated. Besides, it is illustrated, and a distribution map is presented. Notes on collecting number of type specimen of this species are provided.Öğe An overview of biodiversity and conservation status of steppes of the Anatolian Biogeographical Region(Springer, 2016) Ambarlı, Didem; Zeydanlı, Uğur S.; Balkız, Özge; Aslan, Serdar; Karaçetin, Evrim; Sözen, Mustafa; Vural, MecitThe Anatolian Biogeographical Region is unique in the Palearctic realm, with high plant and butterfly species richness and populations of globally threatened birds, mammals and herptiles (amphibians and reptiles). It is a place of diverse land-use practices, dating back to the earliest farming practices in the world. Among 10,930 species of vascular plants, birds, butterflies, mammals and herptiles distributed in Turkey, we identified 1130 living predominantly in steppic environments and being classified either as threatened, near-threatened or data deficient at the national level, if not globally. A total of 28 effective protected areas were present in the region, covering 1.5 % of the 391,597 km(2) land area. Only 16.2 % of the threatened and near-threatened species (n = 809) were distributed within the protected area network, ranging from 94.1 % for birds to as low as 12.9 % for vascular plants. The total area of steppe and steppe forest vegetation has been reduced by at least 44 % of its former extent due to diverse habitat destructive activities. The most significant threats arise from unsustainable agricultural activities including overgrazing, conversion to croplands and afforestation. To maintain steppe diversity, we propose a "to-do list", including mainstreaming biodiversity, effective implementation of Turkey's Rangeland Act, conducting effective environmental impact assessments, establishing an effective site network for steppe biodiversity conservation and filling gaps in scientific knowledge.Öğe The Preparation of Zeolite/Ag Composite Powders by Electroless Deposition Process(Springer, 2014) Uysal, Mehmet; Karslıoğlu, Ramazan; Gül, Harun; Aslan, Serdar; Keskin, S.Y.; Okumuş, S.C.; Alp, A.Core-shell Ag-coated zeolite composite powders were synthesized using silver electroless deposition process, which was carried out in an ammonia-based coating solution containing silver nitrate as a precursor material. The influence of the chemical components and powder concentration in the Ag coating was investigated by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction techniques. The zeolite/Ag composite powders were fabricated in order to find an antibacterial material and a new implant material based on the microstructural change of zeolite/Ag composites powders using different parameters of Ag deposition.Öğe Presence of Centaurea regia Boiss. subsp. regia (Subgen. Cynaroides (Boiss. ex Walp.) Dostál, Compositae) in Turkey(2010) Aslan, Serdar; Vural, Mecit; Şahin, Bilal; Çelik, Sezgin; Karavelioğulları, Faik AhmetCentaurea regia subsp. regia (Subgen. Cynaroides) taksonu Handel-Mazetti tarafından, Diyarbakır - Cizre arasından not edilmiş, fakat toplanmamıştır. Bu nedenle Wagenitz, bu taksonu Türkiye florasında süpheli kayıt başlığı altında belirtmiştir. Bu çalışmada, bu taksonun ülkemizdeki varlığı kanıtlanmıştır. Taksonun tanıtıcı özellikleri, yetişme ortamı ve koruma durumu belirtilmiştir. Ayrıca bu makalede taksonun, fotoğrafları ve yayılış haritası da verilmiştir.Öğe Presence of Centaurea regia Boiss. subsp. regia Subgen. Cynaroides Boiss. ex Walp. Dostál, Compositae in Turkey(Ersin YÜCEL, 2010) Aslan, Serdar; Vural, Mecit; Şahin, Bilal; Çelik, Sezgin; Karavelioğulları, Faik AhmetCentaurea regia subsp. regia Subgen. Cynaroides Heywood, 1975 was noted but not collected by HandelMazetti near Diyarbakır and Cizre. Therefore, Wagenitz indicated the taxon under the headline “Species doubfully recorded” in Flora of Turkey. In this paper, presence of Centaurea regia in Turkey was shown. Description of the taxon was given together with its habitat, ecology and conservation status. Additionally, it was illustrated, and a distribution map was presented
