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Öğe A contribution to the cave spider fauna of Turkey (Araneae)(TAYLOR & FRANCIS LTD, 2013) Topcu, Aydin; Seyyar, Osman; Demircan, Nurcan[Abstract Not Available]Öğe A Contribution to the Study of Turkish Spider Fauna (Araneae)(INST ZOOLOGY, BAS, 2014) Demir, Hakan; Seyyar, Osman; Turkes, TuncayFour spider species, Agelescape caucasica Guseinov, Marusik & Koponen, 2005, Megalepthyphantes nebulosus (Sundevall, 1830), Micaria bosmansi Kovblyuk & Nadolny, 2008, and Phlegra cinereofasciata (Simon, 1868), are reported as new for the spider fauna of Turkey. Data on the collecting sites and the general distribution of each species are presented.Öğe A new species of Palliduphantes from turkish caves (Araneae : Linyphiidae)(AMER ENTOMOL SOC, 2008) Demir, Hakan; Topcu, Aydin; Seyyar, OsmanA new species of Palliduphantes Saaristo and Tanasevitch in 2001 is described from Turkey. Differences between the new species and related species are discussed.Öğe A new spider family record for Turkey (Araneae : Anyphaenidae) aydin Topcu, Tuncay Turkes, Hakan Demir, and Osman Seyyar(AMER ENTOMOL SOC, 2008) Topcu, Aydin; Turkes, Tuncay; Demir, Hakan; Seyyar, OsmanThe spider Anyphaena pontica Weiss, 1988 (Araneac, Anyphaenidae) and Anyphaenidae family are recorded from Turkey for the first time.Öğe A new spider of the genus Troglohyphantes (Araneae: Linyphiidae) from a Turkish cave(MAX KASPAREK VERLAG, 2008) Topcu, Aydin; Turkes, Tuncay; Seyyar, OsmanA new species of Troglohyphantes Joseph, 1881 is described from Turkey. Differences between the new species and related species are discussed. The morphological characters to distinguish this species from the closely related species are indicated and illustrated. Notes on the habitat and some SEM photographs of this species arc also given.Öğe A physicochemical characterization of fully acetylated chitin structure isolated from two spider species: With new surface morphology(ELSEVIER SCIENCE BV, 2014) Kaya, Murat; Seyyar, Osman; Baran, Talat; Erdogan, Sevil; Kar, MusaSpiders are a huge group which includes more than 44,000 species. But there has been no study of the chitin structure of spiders. In this study we physicochemically characterized chitin structure of two common spider species (Geolycosa vultuosa and Hogna radiata). Chitin content was determined as 8-8.5% for G. vultuosa and 6.5-7% for H. radiata. FTIR, TGA and XRD results showed that the chitin structures are in a-form. Environmental scanning electron microscopy (ESEM) revealed that the surface morphology of each species is different. Chitin yielded from G. vultuosa has two different pore structures. The type one pore is rarely sequenced and its size ranges between 190 and 240 nm, while the type two pore is tightly sequenced and its size ranges between 11 and 32 nm. There is no information in previous studies about the chitin structure with two different pore morphologies. A new chitin surface morphology has been determined in G. vultuosa. The chitin isolated from H. radiata, has classic morphology: nanofibre structures (10-17 nm) and 195-260 nm sized pores. Acetylation degree of the chitin samples was calculated as 97% for G. vultuosa and 99% for H. radiata in accordance with elemental analysis results. (C) 2014 Elsevier B.V. All rights reserved.Öğe Akdeniz bölgesi araneofaunasının belirlenmesi(2009) Topçu, Aydın; Türkeş, Tuncay; Demir, Hakan; Seyyar, Osman[Abstract Not Available]Öğe Argyroneta aquatica (CLERCK, 1757) (Araneae: Cybaeidae) as a Biological Indicator for Environmental Pollution of Sultan Marsh National Park, Turkey(INST ZOOLOGY, BAS, 2010) Seyyar, Osman; Demir, Hakan; Kar, Musa; Duman, FatihSultan Marsh (Turkey) is one of the largest wetland of the Middle East and Europe. The marsh was designated as a Ramsar Site, a Nature Conservation Area, and recently a National Park by Turkish Government. Despite its strong conservation status, the marsh has undergone rapid degradation in recent years. However, major changes have been observed in Sultan Marsh in the last two decades. The water spider, Argyroneta aquatica (CLERCK, 1757), was lastly observed in 2000 in the region. Since then, this species has not been observed in the marsh. Increased of pollution in Sultan Marsh is the most probable cause for lacking the species. It may be argued that the water spider can be used as an ecological indicator to determine environmental changes.Öğe Bat guano as new and attractive chitin and chitosan source(BIOMED CENTRAL LTD, 2014) Kaya, Murat; Seyyar, Osman; Baran, Talat; Turkes, TuncayIntroduction: Chitin is a biopolymer that forms the exoskeleton of arthropods, and is found in the cell walls of fungi. It has a wide range of uses in fields such as cosmetics, pharmacy, medicine, bioengineering, agriculture, textiles and environmental engineering based upon its nontoxic, ecofriendly, biocompability and biodegradability characteristics. Commercially, chitin is obtained from processing the outer skeleton of Crustacea such as shrimp, crab, prawn and crayfish after they have been consumed as food. The study aims to examine the nature of bat guano and to determine if it is a practical source of chitin, which has not been done previously. Results: In this study, the chitin content of dry bat guano samples was found to be 28%. The bat guano, which was collected from Karacamal Cave, came from the bat species Rhinolophus hipposideros. The chitosan yield of this chitin was 79%. The chitin produced from the bat guano was determined to be in the alpha form according to Fourier transform infrared spectroscopy (FTIR) results. The crystallinity of the chitin and chitosan samples was calculated as 85.49 and 58.51% respectively by X-ray crystallography (XRD) experiments. According to scanning electron microscope (SEM) micrographs, the chitin and chitosan structures were shaped like nanofibers. The thermogravimetric analysis (TGA) results showed that both chitin and chitosan had two step weight losses, which are characteristic of these materials. The nitrogen content of the chitin and chitosan was 6.47 and 7.3% respectively according to the elemental analysis results. Conclusions: In this research, it has been observed that bat guano can be considered to be an alternative source of chitin and chitosan to crab, shrimp, crayfish and krill.Öğe Biosorption of Ni (II), Pb (II), and Cu (II) metal ions on the chitin isolated from spider species of Drassodes lapidosus(Tubitak Scientific & Technological Research Council Turkey, 2024) Emini, Albulene; Seyyar, Osman; Surme, YavuzThis study evaluates the biosorption ability of chitin derived from a specific spider species, namely Drassodes lapidosus (Walckenaer, 1802), that belongs to the family Gnaphosidae. The obtained chitin was characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analysis. In the alpha form of the obtained chitin, its thermal stability was observed to be 356.9 degree celsius and, the CrI value was 69.16%. In addition, this chitin was used as a bioadsorbent to remove heavy metal ions such as Ni (II), Cu (II), and Pb (II) from the aqueous medium by solid phase extraction (SPE) method using mini adsorption columns. The SPE method was optimized by changing one variable at a time. Main parameters affecting the SPE technique such as solution pH, sample volume, and interfering ions were optimized in model metal solutions containing Pb (II), Cu (II), and Ni (II) at certain concentrations. Metal concentrations were determined using a flame atomic absorption spectrophotometer (FAAS). The results revealed that Pb (II), Cu (II), and Ni (II) ions could be quantitatively removed from their environment at pH 5 through adsorption onto the surface of the chitin, even in the presence of possible interfering anions and cations at high concentrations. Pb (II), Cu (II), and Ni (II) could be separated quantitatively from aqueous solutions by using Drassodes lapidosus chitin as an adsorbent.Öğe COMPARISON OF CHITIN STRUCTURES DERIVED FROM THREE COMMON WASP SPECIES (Vespa crabro LINNAEUS, 1758, Vespa orientalis LINNAEUS, 1771 and Vespula germanica (FABRICIUS, 1793))(WILEY, 2015) Kaya, Murat; Bagriacik, Nil; Seyyar, Osman; Baran, TalatThere has been no study on the chitin structure of wasp species. Here, we selected the three most common wasp species belonging to the family Vespidae for chitin extraction and characterization. Chitin was isolated from each wasp species and characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffractometry (XRD), elemental analysis (EA), and scanning electron microscopy (SEM). The chitin contents of Vespa crabro, Vespa orientalis, and Vespula germanica were 8.3, 6.4, and 11.9%, respectively. The crystalline index (CrI) values for the chitin extracted from each species were 69.88, 53.92, and 50%, respectively. The most important finding of the study is that although the same method was used to extract chitin from each of the three wasp species, the degree of acetylation was different: for V. crabro and V. orientalis it was 96.85 and 99.82% ( the chitin was extremely pure), respectively, whereas that for V. germanica the chitin was 79.83%. (C) 2015 Wiley Periodicals, Inc.Öğe Contribution to the jumping spider fauna of Turkey (Araneae: Salticidae)(TAYLOR & FRANCIS LTD, 2009) Topcu, Aydin; Demir, Hakan; Seyyar, Osman[Abstract Not Available]Öğe Contribution to the knowledge of the Philodromidae (Arachnida : Araneae) of Turkey(TAYLOR & FRANCIS LTD, 2008) Demir, Hakan; Topcu, Aydin; Seyyar, Osman[Abstract Not Available]Öğe Contributions to the Linyphiidae fauna of Turkey (Arachnida: Araneae)(TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2015) Turkes, Tuncay; Karabulut, Hayriye; Demir, Hakan; Seyyar, OsmanAbacoproeces topcui sp. nov. (Araneae: Linyphiidae) is described based on male specimens from Mersin Province in Turkey. Four species, namely Araeoncus tauricus Gnelitsa, 2005; Erigonoplus globipes (L. Koch, 1872); Megalepthyphantes pseudocollinus Saaristo, 1997; and Styloctetor romanus (O.P.-Cambridge, 1872), belonging to this family are new records for the spider fauna of Turkey. Styloctetor Simon, 1884 has been recorded as a new genus for Turkey. Data on collected localities, distribution throughout the world, and genitalia figures of each species are presented.Öğe Description of a new species of the genus Nomisia Dalmas, 1921 (Araneae: Gnaphosidae) from Turkey with some faunistical remarks(MAGNOLIA PRESS, 2009) Seyyar, Osman; Ayyildiz, Nusret; Topcu, AydinNomisia anatolica sp.n. is described and illustrated from Turkey. Morphological features and detailed description based on collected material of Nomisia orientalis Dalmas, 1921 are presented. Nomisia negebensis Levy, 1995 is recorded for the first time from Turkey.Öğe Description of the previously unknown female of Drassodes bifidus Kovblyuk & Seyyar, 2009 (Araneae: Gnaphosidae) from Turkey(TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2015) Seyyar, Osman; Demir, Hakan; Turkes, TuncayDrassodes bifidus Kovblyuk & Seyyar, 2009, previously known only from one male from southern Turkey (Alanya District, Antalya Province), is redescribed on the basis of newly collected materials. The female of Drassodes bifidus is described for the first time. Illustrations, description, and distribution are presented.Öğe Ege Bölgesi mağaraları örümcek faunasının belirlenmesi(2014) Topçu, Aydın; Türkeş, Tuncay; Seyyar, Osman; Demircan, Nurcan; Karabulut, Hayriye[Abstract Not Available]Öğe İç Batı Anadolu Bölgesi (Afyonkarahisar, Uşak, Kütahya) Örümcek Faunasının Araştırılması(2016) Seyyar, Osman; Oba, Anıl; Demir, Hakan; Türkeş, Tuncay[Abstract Not Available]Öğe Karyological data and meiosis of Drassyllus praeficus (L. Koch, 1866) (Gnaphosidae) and Thanatus imbecillus (L. Koch, 1878) (Philodromidae) from Turkey(TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2013) Kumbicak, Zubeyde; Karatas, Ayla; Kumbicak, Umit; Seyyar, OsmanIn this study, karyotypic and cytogenetic characteristics of Drassyllus praeficus (L. Koch, 1866) and Thanatus imbecillus (L. Koch, 1878) were investigated for the first time by examining mitotic and meiotic chromosomes obtained from gonad cells. The number and the sex chromosome system of D. praeficus and T imbecillus males was 2n = 22 (X(1)X(2)0) and 2n = 28 (X(1)X(2)0), respectively. D. praeficus had 10 autosomal bivalents and 2 univalent sex chromosomes, and T imbecillus had 13 autosomal bivalents and 2 univalent sex chromosomes during the first meiotic prophase and metaphase. Both species possessed acrocentric chromosomes in their karyotypes.Öğe
