Yemler Bilgisi Yem Teknolojisi ve Balık Besleme
Bilgüven, Murat
Her havuz alanında ya da yetiştirme biriminden elde edilen balık ve dolayısıyla balık yetiştiriciliğinin kârlılığı, büyük ölçüde kullanılan yemin miktarına bağlıdır. Su ürünleri sistemi ne kadar yoğun olursa yemlemenin önemi o kadar fazla olur ve toplam üretim maliyetinde yem maliyetinin payı da o kadar artar. Bilindiği üzere alabalık başta olmak üzere bazı balıkların yetiştiriciliği için akarsu sistemli tesisler kullanılmakta yada sıcaklığın, su bileşiminin ve akıntının dolayısıyla oksijen yoğunluğunun daha iyi olduğu tatlı su ve kıyılarda ise yüzer ağ kafeslerde yetiştiricilik yapılmaktadır. Su ürünleri yetiştiriciliğinin ileri durumda olduğu ülkelerde entansif yetiştiricilik uygulanmakta ve yetiştirme alanlarında birim hacimde maksimum ürün yetiştirilmeye çalışılmaktadır. Bu tür yetişti...
A highly efficient catalyst consisting of Ni and S double-doped reduced graphene modified with ZnO nanoparticles for hydrogen peroxide electroreduction
Sedef Kaplan A, Rukan Suna Karatekin A
n this study, we prepared a novel electrocatalyst based on S doped reduced graphene layer modified with Ni and ZnO nanoparticles. The catalyst materials were characterized by X-ray Powder Diffraction (XRD), Raman spectroscopy, UV–vis spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), and mapping. Because of the synergistic effect between three materials (S, Ni, and ZnO), the new electrocatalyst finally formed with a large electroactive surface area. Through the measurement, it was concluded that this surface includes large active sites which can effectively improve the electron transfer rate. The electrocatalytic activity of Ni-ZnO@s-rGO toward H2O2 reduction was examined via some measurements such as CV, I-t measurement, and electrochemical imped...
Role of antioxidant defense system and biochemical adaptation on stress tolerance of high mountain and steppe plants
Keleş, Yüksel
Eleven species were collected from Northwest Anatolian mountains (1500–2000 m) and 18 species were collected from the Central Anatolian steppes (850–1000 m) in June 1998 and 1999. In all the species investigated, the water and dry matter percentages and solute contents were measured. The chlorophyll, b-carotene, ascorbate and a-tocopherol contents and catalase (CAT), superoxide dismutase (SOD) andglutathione reductase (GR)enzymeactivities oftheplants werealsodetermined.Thesteppeplantshadlowerwatercontentcomparedwith alpine plants. The chlorophyll contents of the plants investigated did not change with altitude. However, the carotenoid/chlorophyll ratio of alpine plants was found to be significantly higher. The antioxidant/chlorophyll ratio of the trees and shrubs was higher than that of he...
Corrosion inhibition of indole-3-acetic acid on mild steel in 0.5 M HCl
Avcı, Gülşen
Corrosion inhibition of indole-3-acetic acid on mild steel in acidic medium (0.5 M HCl) containing the desired amount of inhibitor has been investigated at different temperatures by using potentiodynamic polarization, electrochemical impedance spectroscopy, and polarization resistance measurements. The experimental results showed that corrosion potential shifted toward a more negative potential region in the presence of indole-3-acetic acid than that of blank solution. According to the obtained results from all measurements, inhibition efficiency was about 77% with 1.7 × 10−3 M inhibitor present, increasing to about 93% at the 1 × 10−2 M inhibitor concentration. Potentiodynamic polarization measurements showed that the current at anodic and cathodic regions obtains a smaller value in the p...
Gülşen Avcı sciencedirect.com alanından [HTML] Inhibitor effect of N, N′-methylenediacrylamide on corrosion behavior of mild steel in 0.5 M HCl
Avcı, Gülşen
N,N′-Methylenediacrylamide has been evaluated as a corrosion inhibitor for mild steel electrodes in 0.5 M HCl solution using potentiodynamic polarization, electrochemical impedance spectroscopy, and polarization resistance measurements. According to the experimental results, inhibition efficiency increased with increasing inhibitor concentration. Potentiodynamic measurements showed that the presence of inhibitor molecules decreases cathodic and anodic currents and shifts corrosion potential to a more positive potential region. Adsorption of the inhibitor molecules to the mild steel surface obeyed the Langmuir adsorption isotherm. Adsorption free energy was calculated from the adsorption isotherm as −26.8 kJ mol−1. The negative value of ΔGads showed that the adsorption process is spontaneou...
H2O2 Sensing on Co3O4-s-rGO Modified with Ni Nanodots
Rukan Suna Karatekin | Meltem Kahya Düdükcü | Gülşen Avcı
In this paper, Ni@Co3O4-s-rGO was synthesized and constructed as a non-enzymatic sensor to detect hydrogen peroxide(H2O2). The prepared sample was characterized using SEM–EDX, UV–vis, XRD, and Raman spectroscopy. In 0.1 Mphosphate-buffered saline (PBS), the fabricated Ni@Co3O4-s-rGO amperometric sensor demonstrated a high sensitivity of 160.3 μA·mM⁻1 towards H2O2 within the linear detection range of 1 to 2000 μM. The detection limit was also determinedas 3.6 μM. Furthermore, the Ni@Co3O4-s-rGO catalyst demonstrated high selectivity towards H2O2,even in the presenceof common interferents. The enhanced electrochemical sensing ability of the catalyst is attributed to the synergy of three factors: the relatively large electrode active area, the high electrical conductivity, and the electron mo...
Male Genital Morphology of Certain Hesperiidae Species and the Variations in the Genitalia of Carcharodus alceae (Lepidoptera, Hesperiidae)
Bazı Hesperiidae Türlerinin Genital Morfolojisi ve Carcharodus alceae (Lepidoptera, Hesperiidae)’nin Genital Organ Variyasyonları
Hüseyinoğlu, Yusuf
Bu çalışmada, Hatay ilinin farklı yüksekliklerdeki değişik bitki örtüsüne sahip lokalitelerinden toplanan Hesperiidae faimilyasına ait 9 türün (Ochlodes venatus, Gegenes pumilio, Pyrgus melotis, Pyrgus serratulae, Spialia orbifer, Spialia phlomidis, Erynnis tages, Carcharodus orientalis, Carcharodus alceae) erkek genital preparatları hazırlanarak türlerin morfolojileri tarif edilmiştir. Hatmi Zıpzıpının (Carcharodus alceae) erkek genital organı İspanya, Hollanda, Afganistan ve Fransa’dan verilen literatür ile karşılaştırıldı. Carcharodus alceae’e ait erkek genital organı ve variyasyonlar bu çalışmada verilmiştir.