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Articles 18391 - 18420 of 18793
Full-Text Articles in Entire DC Network
A Preliminary Study On The Ostracoda (Crustacea) Fauna Of Lake Beyşehir, Selçuk Altinsaçli, Mustafa Kiliç, Songül Altinsaçli
A Preliminary Study On The Ostracoda (Crustacea) Fauna Of Lake Beyşehir, Selçuk Altinsaçli, Mustafa Kiliç, Songül Altinsaçli
Turkish Journal of Zoology
The material was collected in July and September 1997 from 15 stations on Lake Beyßehir. A total of 15 species ( Ilyocypris biplicata, Ilyocypris gibba, Ilyocypris bradyi, Candona neglecta, Pseudocandona compressa, Prionocypris zenkeri, Eucypris virens, Heterocypris rotundata, Heterocypris incongruens, Cypria ophtalmica, Physocypria kraepelini, Cypridopsis vidua, Potamocypris zschokkei, Psychrodromus olivaceus, Darwinula stevensoni) belonging to 12 genera were determined. Of these, Heterocyprisrotundatais new addition to the Ostracoda fauna of Turkey.
On The Asymptotics Of Fourier Coefficients For The Potential In Hill's Equation, Haskiz Coşkun
On The Asymptotics Of Fourier Coefficients For The Potential In Hill's Equation, Haskiz Coşkun
Turkish Journal of Mathematics
We consider Hill's equation $y'' +(\lambda -q)y=0$ where $q\in L^{1}[0,\pi ].$ We show that if $l_{n}-$the length of the $n-th$ instability interval$-$ is of order $O(n^{-k})$ then the real Fourier coefficients $a_{n},b_{n}$ of $q$ are of the same order for$(k=1,2,3)$, which in turn implies that $q^{(k-2)}$, the $(k-2)th$ derivative of $q$, is absolutely continuous almost everywhere for $k=2,3.$
Electroreduction Of Some Diazine And Triazine Pesticides At The Dropping Mercury Electrode, Petr Zuman, Marina Privman, Masami Shibata, Jiri Ludvik
Electroreduction Of Some Diazine And Triazine Pesticides At The Dropping Mercury Electrode, Petr Zuman, Marina Privman, Masami Shibata, Jiri Ludvik
Turkish Journal of Chemistry
Electroanalytical methods enable determination of electroactive species in nonhomogeneous systems, as limiting currents are little affected by the presence of solid and colloidal particles. An example of such applications of electrochemical methods are studies of binding of toxic substances, such as pesticides, on slightly soluble polymers, such as lignin. To successfully apply polarographic methods for following free pesticides in a slurry of lignin, it is first necessary in principle to elucidate the electrochemical processes involved. In aqueous buffered solutions the electron transfers, in which organic compounds participate, are in the majority of cases accompanied by chemical reactions. To elucidate the …
Synthetic Metal Alloys: Preparation Of Polyaniline/Polypyrrole Alloys In Protic Medium, Fati̇h Köleli̇, Meltem Düdükcü, Yasemi̇n Arslan
Synthetic Metal Alloys: Preparation Of Polyaniline/Polypyrrole Alloys In Protic Medium, Fati̇h Köleli̇, Meltem Düdükcü, Yasemi̇n Arslan
Turkish Journal of Chemistry
Pyrrole and aniline solutions were mixed in different ratios and oxidized under anodic conditions on Pt surface in protic medium. The electrocopolymerization and electrochemical properties of these alloys were investigated. Current-potential diagrams of polyaniline (PA), polypyrrole (PP) and the resulting alloys were recorded and their electrochemical characterizations were identified. In-situ resistance measurements of synthesized alloys were carried out with a home-made apparatus. Conductivity of alloys showed changes depending on applied potential as intrinsic polymers. The electrochemical behaviour of homopolymers and alloys was studied at different temperatures.
Angiomyolipoma In The Breast And Review Of Literature, Murat Alper, Nusret Akyürek, Süleyman Balkanli, Osman Yüksel
Angiomyolipoma In The Breast And Review Of Literature, Murat Alper, Nusret Akyürek, Süleyman Balkanli, Osman Yüksel
Turkish Journal of Medical Sciences
No abstract provided.
Production And Characterization Of Monoclonal Anti-Ovalbumin Antibodies, Mehmet Zi̇ya Doymaz, Hakan Bulut, Aykut Özdarendeli̇, Yusuf Bolat
Production And Characterization Of Monoclonal Anti-Ovalbumin Antibodies, Mehmet Zi̇ya Doymaz, Hakan Bulut, Aykut Özdarendeli̇, Yusuf Bolat
Turkish Journal of Medical Sciences
In this study, the results of anti- ovalbumin (OVA) monoclonal antibody production and characterization are reported. Splenocytes from OVA-hyperimmune Balb/C mouse were fused with F0 myeloma cells and resulting hybridoma cells were selected in hypoxanthine-aminopterine-thymidine containing medium. A total of 37 HAT resistant hybridomas were obtained. Upon testing the hybridoma supernatants in OVA and mouse immunoglobulin G specific enzyme-linked immunosorbent assays, we observed that two of the hybridomas secreted OVA specific antibodies. The hybridomas produced IgG class antibodies. The hybridomas were grown and the supernatants from the cultures were also tested in a Western Blot assay. The results of ELISA …
The Radioprotective Effect Of Vitamins C, E And Vitamin E + Glutathione On The Small Intestine And The Thyroid Gland In Rats Irradiated With X- Rays, Cemi̇l Sert, M. Sali̇h Çeli̇k, Zülküf Akdağ, M. Aydin Ketani̇, Yusuf Nergi̇z
The Radioprotective Effect Of Vitamins C, E And Vitamin E + Glutathione On The Small Intestine And The Thyroid Gland In Rats Irradiated With X- Rays, Cemi̇l Sert, M. Sali̇h Çeli̇k, Zülküf Akdağ, M. Aydin Ketani̇, Yusuf Nergi̇z
Turkish Journal of Medical Sciences
This investigation was carried out in order to determine the protective effects of long term administration at supraphysiologi- cal doses of vitamin E, vitamin C and a compound of vitamin E + glutathione against damage induced by free radicals produced by ionizing radiation. Five groups of 8-10-week-old Wistar albino rats were used in the study. Group I was the sham group and Group II was the radiation group (i.e. radiation alone). The rats in Group III were given a daily dose of 400 mg/kg of vit. C for one month. The rats in Group IV were given a daily dose …
Antioxidant And Hepatoprotective Activity Of Vitamin E And Egb 761 In Experimental Endotoxemic Rats, Ömer Coşkun, Bi̇rkan Yakan, Emi̇n Öztaş, Şaban Sezen, Ali̇ A. Günaydin
Antioxidant And Hepatoprotective Activity Of Vitamin E And Egb 761 In Experimental Endotoxemic Rats, Ömer Coşkun, Bi̇rkan Yakan, Emi̇n Öztaş, Şaban Sezen, Ali̇ A. Günaydin
Turkish Journal of Medical Sciences
In this experimental study, we investigated whether vitamin E and EGb 761 have any influence on endotoxemic rats and liver histopathology. Forty rats were divided into four groups of 10 animals in each group. The control rats were untreated and comprised group 1. Two ml serum was applied to the rats intraperitoneally (i.p.) in group 2, and then 0.5 ml endotoxin solution ( E. Coli 0:157:H7, 10 9 bacteria/ml) was given to the same group two hours later. Not only endotoxin solution but also vitamin E (600 mg/kg) was given to the rats in group 3. Endotoxin solution and EGb …
Auditory Brain Stem Response Screening For Hearing Loss In High Risk Neonates, Hülya Bi̇lgen, İpek Akman, Eren Özek, Sezer Külekçi̇, Rahmi̇ Örs, Kürşat Carman, Ferda Akdaş
Auditory Brain Stem Response Screening For Hearing Loss In High Risk Neonates, Hülya Bi̇lgen, İpek Akman, Eren Özek, Sezer Külekçi̇, Rahmi̇ Örs, Kürşat Carman, Ferda Akdaş
Turkish Journal of Medical Sciences
Hearing screening of neonates is the key to preventing the most severe consequences of congenital hearing loss. In this paper, the auditory brain stem responses (ABR) of neonates at high risk for hearing impairment at Marmara University Hospital Neonatal Intensive Care Unit are reported. One hundred fifty-four high-risk neonates underwent screening by ABR carried out according to the US Joint Committee on Hearing 1994 Position Statement. One hundred and fourteen of them passed the first ABR test while 40 patients failed. The number of patients with sensorineural and conductive hearing deficit was 5 and 35, respectively. Fifteen of the infants …
Internal Photoemission Spectroscopy For A Ptsi/P-Si Schottky Junction, Bülent Aslan, Raşi̇t Turan
Internal Photoemission Spectroscopy For A Ptsi/P-Si Schottky Junction, Bülent Aslan, Raşi̇t Turan
Turkish Journal of Physics
Properties of internal photoemission in a PtSi-Si Schottky junction have been studied. The traditional Fowler plot of a detector's photoyield is found to be nonlinear for values close to the barrier height of the junction. It is shown that the model that takes all scattering mechanisms into account provides a successful description for the experimental results. It is also shown that the photoemission spectrum is independent of temperature in agreement with this model. The properties of detector's ambient influence the photoemission spectrum for wavelength of 3 $\mu$m or less. A strong loss in the detector's response is observed at around …
Borate Deposits Of Turkey And Argentina; A Summary And Geological Comparison, Cahi̇t Helvaci, Ricardo R. Alonso
Borate Deposits Of Turkey And Argentina; A Summary And Geological Comparison, Cahi̇t Helvaci, Ricardo R. Alonso
Turkish Journal of Earth Sciences
No abstract provided.
Distance Spectra For Trellis Coded Modulation Schemes On Channels With Intersymbol Interference, Sabi̇re Haciömeroğlu, Melek D. Yücel
Distance Spectra For Trellis Coded Modulation Schemes On Channels With Intersymbol Interference, Sabi̇re Haciömeroğlu, Melek D. Yücel
Turkish Journal of Electrical Engineering and Computer Sciences
The effect of intersymbol interference on distance spectra for trellis coded 8-PSK, 16-QAM and 32-AMPM modulation schemes is evaluated using the methods proposed by Schlegel. Distance spectra of 16-state 8-PSK scheme are computed for different intersymbol interference channels. It is seen that on channels with intersymbol interference the spectral lines are spread into a nearly continuous spectrum and the minimum Euclidean distance between codewords decreases severely. Hence, although the main contribution at large signal to noise ratios comes from the minimum Euclidean distance ( d_{free} ) , higher spectral components also become very important at moderate values of the signal …
Control Chart Pattern Recognition Using Artificial Neural Networks, Şeref Sağiroğlu, Erkan Beşdok, Mehmet Erler
Control Chart Pattern Recognition Using Artificial Neural Networks, Şeref Sağiroğlu, Erkan Beşdok, Mehmet Erler
Turkish Journal of Electrical Engineering and Computer Sciences
Precise and fast control chart pattern (CCP) recognition is important for monitoring process environments to achieve appropriate control and to produce high quality products. CCPs can exhibit six types of pattern: normal, cyclic, increasing trend, decreasing trend, upward shift and downward shift. Except for normal patterns, all other patterns indicate that the process being monitored is not functioning correctly and requires adjustment. This paper describes a new type of neural network for speeding up the training process and to compare three training algorithms in terms of speed, performance and parameter complexity for CCP recognition. The networks are multilayered perceptrons trained …