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Variability of Essential Oil Composition of Origanum vulgare L. subsp. gracile Populations from Turkey.
No full textThe aerial parts of fifteen different populations of O. vulgare L. subsp. gracile were
investigated to determine their variability among essential oil compositions. Thymol, carvacrol, γ-terpinene
and p-cymene were detected as the major components of all population samples in different amounts. Almost
all populations had the same essential oil contents, except for minor differences. The most abundant components
were thymol and carvacrol
Çayır ve Meraların Bölgesel Kalkınma Üzerindeki Etkisi
No full textÜlke olarak hayvancılığımızın ihtiyaç duyduğu kaba yem, belli başlı üç ana
kaynaktan sağlanmaktadır. Bunlar çayır-mera alanları, yem bitkileri ve bitkisel
üretim artıklarıdır. Ülkemizde 15,7 milyon büyükbaş hayvan birimine tekabül eden
hayvan varlığımız bulunmaktadır. Bu hayvanların ihtiyaç duyduğu kaba yem miktarı
yaklaşık olarak 70,7 milyon tondur. 70,7 milyon tonun yaklaşık 14,6 milyon tonu
çayır meralardan, 7,4 milyon tonu yem bitkilerinden ve 19,5 milyon tonu ise silajlık
mısırdan karşılanmaktadır. Geriye kalan 29,2 milyon tonluk miktar ise bitkisel
üretim artıklarından karşılanmaktadır. Bitkisel üretim artıklarından sağlanan kaba
yem miktarı hayvanlardan beklenen hayvansal üretimi sağlamaktan ziyade sadece
yaşama payı ihtiyacını karşılamaktadır. Kaliteli kaba yem ihtiyacı ancak çayır-mera
alanlarından ve yem bitkilerinden karşılanabilir. Kaliteli kaba yem kaynağı olan
çayır-meraların ıslahı durumunda, hayvanların ihtiyaç duyduğu kaliteli kaba yem
açığı karşılanacak ve hayvansal üretim artışı sağlanabilecektir. Hayvansal üretimin
artması ile bölge insanının gelir düzeyi artacak ve insanların daha dengeli
beslenmesi sağlanacaktır
In Vitro Callus Propagation and Antibacterial Activities of Callus An Edible Endemic and Medicinal Plant Scutellaria orientalis L. subsp. bicolor.
No full textPlants are a stupendous source for exploration of new medicinal products for drug development. Today several drugs used to treat many diseases are simply synthetic modifications or copies of naturally obtained plant substances or extracts. Medicinal plants offer best source to obtain a variety of new drugs; and new plants need to be investigated for their potential use against various microorganisms including bacteria. Scutellaria orientalis subsp. bicolor in the Lamiaceae (mint) family, is an endemic plant species that grows widely on abondoned lands at altitude of 1000-2800 meters in Eastern Anatolia. The plant or extracts are popularly used in preparation of various traditional medicines to treat many diseases including stress, breast and ovarian cancers; however there is need to establish validity of these methodologies scientifically as plant tissue culture techniques could serve as an alternative way to produce them. This study aimed to documents crude callus extracts from hypocotyl explants obtained from 17 days old plantlets of Scutellaria orientalis subsp. bicolor for� � � antibacterial activities. Research findings clearly showed inhibition of growth of Staphylococcus aureus COWAN 1 and Bacillus subtilis var. niger ATCC 10 in the extracts determined by disc diffusion methodology. Antibacterial activity was evaluated by measuring zone diameters in mm. No antibacterial activities were detected in control group. The hexane, acetone and methanol extracts of S. orientalis subsp. bicolor calli exhibited inhibitory action against both bacterial strains. Moreover, callus extracts showed less anti bacterial activities on calli developed on MS medium containing NAA compared to calli obtained on MS medium containing BAP. Furthermore, the results confirmed inhibitory effects of increased BAP concentrations on callus weight, size and quantity of extracts. Moreover, methanol extracts showed more antibacterial activity compared to acetone and hexane extracts. � � Better knowledge about antibacterial activities of this endemic plant sub species could be highly useful for understanding ways for cheap, commercial production of these extracts at extensive level under controlled conditions
FARKLI ORANLARDA SiC PARTİKÜL TAKVİYESİ YAPILMIŞ Cu MATRİSLİ KOMPOZİTLERİN MİKROYAPI VE MEKANİK ÖZELLİKLERİ
No full textBu çalışmada, toz metalurjisi (T/M) yöntemi ile farklı oranlarda SiC partikül takviyeli Cu matrisli kompozit malzemeler üretilmiştir. Saf Cu tozu içerisine ağırlıkça %5-25 aralığındaki farklı oranlarda SiC partikül ilavesi yapılarak hazırlanan karışımlar 500 MPa basınç ile şekillendirilmiştir. Şekillendirilen parçalar farklı SiC oranları için optimum sinterleme sıcaklığının tespit edilmesi amacıyla farklı sıcaklıklarda sinterlenmiştir. Sinterleme işlemlerinin başarısı yoğunluk ölçümleri ve mikroskop incelemeleri ile değerlendirilmiştir. En iyi sonucu veren sinterleme parametreleri ile üretilen kompozitlerin mikroyapı ve mekanik özellikleri incelenmiştir. Mikroyapı incelemeleri taramalı elektron mikroskobu (SEM) ve X-ışınları analizi (XRD) ile gerçekleştirilirken mekanik özelliklerinin belirlenmesinde sertlik ölçümleri kullanılmıştır. Mikroyapı incelemeleri, üretilen kompozitlerde nispeten ince ve eşeksenli tanelerden oluşan Cu matris içerisinde SiC takviye fazının homojen bir şekilde dağıldığını göstermiştir. Artan SiC oranıyla birikte elde edilebilen bağıl yoğunluk değerinin düşmesine rağmen sertliğin çarpıcı bir şekilde arttığı gözlenmiştir
Investigation of adsorption and corrosion inhibitive properties of 5-((4-chloro-2-methylphenoxy)methyl)-1,3,4-thiadiazole-2-amine films on mild steel in HCl solution
No full textAdsorption of 5-((4-chloro-2-methylphenoxy)methyl)-1,3,4-thiadiazole-2-amine (CMMTA) on mild steel surface from 1 M HCl solution and its inhibition efficiency against corrosion were studied with the help of electrochemical methods. The mild steel specimens were exposed to 1 M HCl solution in the absence and presence of 1 mM CMMTA and the change of its open circuit potential as a function of exposure time (Eocp-t) was graphically monitored. Electrochemical kinetics parameters were evaluated by potentiodynamic polarization measurements. The metal-film/solution interface was investigated by electrochemical impedance spectroscopy (EIS). The resistance of the steel in the absence and presence of the inhibitor were determined from EIS and linear polarization measurements. It was found that CMMTA has great corrosion protection ability for mild steel. The high inhibition efficiency of this compound was explained by its adsorption on the metal surface and a protective film formation on the steel surfaceThe authors are greatly thankful to Bingöl University Scientific Research Projects (BÜBAP) Coordination Unit and Bingöl University Central Laborator
Electrochemical investigation of 5,5’-(pyrimidine-4,5-diyl)bis(1,3,4-thiadiazole-2-amine) films on mild steel in acidic media
No full textIn this study, a mild steel specimen was exposed to 1 M HCl solution in the absence and presence of 1.0 mM 5,5’-(pyrimidine-4,5-diyl)bis(1,3,4-thiadiazole-2-amine) (PBTA) for 1 hour and corrosion protective properties of a film of the organic compound formed on the mild steel surface was electrochemically investigated. For this aim, the change of open circuit potential as a function of exposure time (Eocp-t), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques were used. It was found that PBTA forms a very protective organic film on the steel surface. The inhibition efficiency of the inhibitor was higher than 95%. This inhibitor acts by reducing the rates of both anodic metal dissolution and cathodic hydrogen evolution reactions.The authors are greatly thankful to Bingöl University Scientific Research Projects (BÜBAP) Coordination Unit and Bingöl University Central Laborator
Purification and Some Properties of Glucose 6-Phosphate Dehydrogenase From Chicken Liver
No full textLonelıness in Virginia woolf's mrs. Dalloway and Elif Şafak's Pinhan
No full textTakdim edilen çalışmada, Virginia Woolf’un Mrs. Dalloway ve Elif Şafak’ın Pinhan
romanlarında Modernizm ve Postmodernizm’in en önemli temalarından biri olan
“yalnızlık” teması yakından incelenmektedir.
Seçilen eserler modern zamanların en yaygın temalarından biri olan yalnızlığa vurgu
yapmaları açısından önemlidir. Mrs. Dalloway ve Pinhan’da yalnızlık temasının ele alınışı,
işlenişi, karakterlerinin gelişim süreçlerine ve sosyal hayatlarına yansıması karşılaştırmalı
olarak irdelendi. Yazarların farklı dönem ve edebiyatlara ait olmalarına rağmen, yalnızlık,
yabancılaşma, hayal kırıklığı ve hüsran temalarını işleyişleri ve bunların etkilerini ortaya
koymaları açısından benzerlikler gösterdikleri gözlemlendi.
Sonuç olarak, yazarların modern ve postmodern dünyada bireyin içinde yaşadığı
dünyayı, aile ve sosyal seviyesini ve sonuçta kendisiyle baş başa “yalnız” kalmasını Mrs.
Dalloway ve Pinhan eserlerinde nasıl örneklediği hedeflendi.In the presented study, the theme of loneliness- one of the most significant themes of
modernism and postmodernism has been examined closely in Virginia Woolf’s
Mrs.Dalloway and Elif Şafak’s Pinhan.
The selected works are important in terms of emphasizing one of the most common
themes of modern times. The handling and treating of loneliness, its reflections on the
characters’ improvement processes and social lives have been studied comparatively in
Mrs. Dalloway and Pinhan. Although the authors belong to different periods and
literatures, it has been observed that they exhibit similarities in terms of handling
loneliness, alienation, disappointment and disillusionment and stressing their effects.
As a result, the study has aimed to explore how individuals, their families and social
status were exemplified in Pinhan and Mrs.Dalloway in the context of modern and post
modern world
Determination of K Shell Fluorescence Parameters for Some Elements in the Atomic Number Range 50≤Z≤60
No full textThe fluorescence cross sections, fluorescence yields, level widths and intensity ratio for some elements in the atomic range 50≤Z≤60 were measured. The targets were excited using photons of 59.54 keV emitted from an Am-241 (about 100 mCi) radioactive source. Emitted K X-ray photons from targets were collected by means of a Si(Li) detector with resolution of 160 eV at 5.9 keV. The present results are generally in a good agreement with theoretical calculations and the other results obtained in the literature