Rediscovery of Scorzonera amasiana Hausskn. and Bornm. - A threatened endemic species in turkey

Karaer, Fergan
Celep, Ferhat
Scorzonera amasiana Hausskn. and Bornm. was described from type specimens collected by J.F.N. Bornmueller in 1889 but it was not collected again until 1993, when it was found near Amasya, Turkey. Populations of S. amasiana were quite small at that limited locations and were vulnerable to human impacts. Therefore, suitable conservation strategies should be developed immediately in order to protect the species from probable extinction. Here, an additional three small populations are reported. Brief history, morphology, habitat and ecology of this endemic species have been discussed. Its current conservation status was re-evaluated with respect to the latest IUCN criteria. A key to distinguish it from the other closely related Turkish species is also provided and its distribution map is appended.


Rediscovery of Dichoropetalum aureum (Umbelliferae) in South Anatolia (Turkey)
ADIGÜZEL, NEZAKET; BANİ, BARIŞ; Mavi, Ozlem (2011-02-07)
Dichoropetalum aureum (BOISS. & BALANSA) PIMENOV & KLJUYKOV was collected from Turkey for the first time in 1856 and described in 1859. Although the species was collected from Lebanon and Israel, it has not been recorded from Turkey since 1856. This study comprises the recollection of Dichoropetalum aureum from the type locality and neighbouring areas after 150 years and also an expanded morphological description. Ecological parameters such as soil and climatic features are given in addition to information ...
Synthesis of new ferrocenyl substituted quinoxaline derivative monomers, their polymerization and electrochemical behaviors
Özdemir, Şerife; Doğan, Özdemir; Toppare, Levent Kamil; Department of Chemistry (2010)
5,8-Bis(2,3-dihydrothieno[3,4b][1,4]dioxin-5-yl)-2-(naphthalen-2-yl)-3-ferrocenyl-4a,8a-dihydroquinoxaline (DEFNQ), 5,8-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2-(phenyl)-3 ferrocenylquinoxaline (DEFPQ) and 5,8-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2,3-di(naphthalen-2-yl)quinoxaline (DEDNQ) were synthesized, electrochemically polymerized and electrochromic properties of resultant polymers were investigated. For the characterization of the monomers Nuclear Magnetic Resonance (1H-NMR, 13C-NMR) w...
Bio-functional analysis of RAD23 gene using virus induced gene silencing method in response to powdery mildew attack in Barley
Aksoy, Yağmur; Akkaya, Mahinur S.; Ersoy, Figen; Department of Biotechnology (2012)
Blumeria graminis f.sp. hordei is an obligate biotrophic parasite causing powdery mildew disease in several cereals, including barley. Virus induced gene silencing (VIGS) is a widely used powerful tool in plant functional-genomic studies to determine the functions of genes in disease resistance. In this thesis study, the function of RAD23 gene in barley in plant resistance was investigated. The RAD23 is a ubiquitin (Ub) binding protein involved in programmed protein degradation by transferring of ubiquityla...
Synthesis and characterization of fluorine-substituted polyanilines
Cihaner, A; Önal, Ahmet Muhtar (Elsevier BV, 2001-09-01)
Poly(2-fluoroaniline), P2FAN, poly(3-fluoroaniline). P3FAN. and poly(4-fluoroaniline), P4FAN, have been synthesized from fluorine substituted aniline monomers in aqueous acidic medium using potassium dichromate as oxidizing agent. Characterization of polymer products has been carried out using FTIR, and NMR spectroscopic techniques. Thermal analysis of polyfluoroaniline powders was also investigated using differential scanning calorimetry and thermogravimetric analysis. To compare the structural properties ...
Self-Organization of PEDOT:PSS Induced by Green and Water-Soluble Organic Molecules
Yıldırım, Erol; Wu, Gang; Tan, Teck Leong; Xu, Jianwei; Yang, Shuo-Wang (American Chemical Society (ACS), 2019-04-18)
Water-soluble poly(3, 4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is the most prominent commercial polymer used in photovoltaic cells and thermoelectric devices. Experimental studies in the last decade have shown that it is possible to enhance the low electrical conductivity of PEDOT:PSS by solvent treatment, either in-solution or by post-treatment methods. The origin and mechanism of electrical conductivity improvement varied according to different experimental studies. We had recently sho...
Citation Formats
F. Karaer and F. Celep, “Rediscovery of Scorzonera amasiana Hausskn. and Bornm. - A threatened endemic species in turkey,” BANGLADESH JOURNAL OF BOTANY, pp. 139–144, 2007, Accessed: 00, 2020. [Online]. Available: