Showing papers by "Istanbul University published in 1977"
TL;DR: The double antibody immunofluorescence technique was applied to serial coronal and sagittal sections of the brains of the trout, Salmo gairdneri, using an antibody against mammalian LH-RH.
Abstract: The double antibody immunofluorescence technique was applied to serial coronal and sagittal sections of the brains of the trout, Salmo gairdneri, using an antibody against mammalian LH-RH. Immunoreactive material was found in small perikarya, situated at both sides of the ventriculus communis in the area dorsalis pars medialis of the telencephalon.
57 citations
TL;DR: In this paper, the theory of nonlocal generalised thermoelasticity is developed within the framework of the nonlocal continuum mechanics, and the constitutive relations are linearised and field equations are provided for homogeneous isotropic solids.
41 citations
TL;DR: In this article, the vertical distribution and the fraction of particles retained in suspension were analyzed, as well as the probability density function of the duration of the retention period of particles in suspension and the mean retention period.
Abstract: The boundary condition at the bed is assumed so that the particles coming to the bed are deposited there so that there is no particle entrainment from the bed into the flow. The boundary condition at the free surface is such that there is no net transport of particles across the free surface. The initial condition is assumed as an instantaneous plane source. The problem is formulated in the Eulerian sense and then Aris moment transformations are employed. The following quantities are analytically predicted: (1) The vertical distribution and the fraction of particles retained in suspension; (2) the probability density function of the duration of the retention period of particles in suspension and the mean retention period; and (3) following the hypothesis that the distribution of deposited particles follows an exponential function with increasing time, the mean and the variance of settling length of particles. /Author/
37 citations
TL;DR: In this paper, the preparation of some new Wolffram's Red Salt analogues of stoichiometry [Pt(L-L)2[Pt L-L 2X2] (ClO4)4 with LL = 1,2-diaminoethane (en) or 1, 2-diminopropane (dapn) and X = Cl, Br or I is described.
31 citations
TL;DR: Lupeol, lup-(20)29-ene-2α,3β-diol and a triterpenic alcohol olean-(13)18-ene 2β, 3β-Diol were isolated from the petrol extract of air dried Salvia horminum and their structures were determined.
25 citations
TL;DR: The major alkaloids of the aerial parts of a Turkish sample of Papaver pseudo-orientale are salutaridine and a new alkaloid, macrantaline, UV, IR, PMR, MS and CD have been used to establish the structure of macrantalinine as 1-(2′-hydroxymethylene-3′, 4′-dimethoxybenzyl)-2-methyl-6,7-methylenedioxy-8-methoxy-1,2,3,4-tetrahydro
18 citations
01 Jan 1977
TL;DR: It was established that chromium excreted in the urine could be used as a criterion for the assessment of degree of exposure to chromium (Franzen etaZ., 1970), and urine is also the biological sample used in studying chromium nutrition in humans.
Abstract: The recognition of the role of chromium as a trace element in nutrition during the course of the past 15 to 20 years (Schwarz and Mertz, 1959), along with a realization of its importance as an occupational health hazard when used in its 6-valence state in the galvanotechnical field, has led to intensive research on chromium. The incidence of diseases of the respiratory system is high among workers who deal with chromium (Baetjer, 1950). The frequent occurrence of bronchial and lung cancer in individuals working in atmospheres highly polluted with chromium prompted efforts toward prevention of, as well as the development of methods of measurement of, excessive exposure to chromium. As a result of investigations in this area, it was established that chromium excreted in the urine could be used as a criterion for the assessment of degree of exposure to chromium (Franzen et al., 1970). Urine is also the biological sample used in studying chromium nutrition in humans.
14 citations
TL;DR: Using signal flow graphs, current differencing amplifiers circuits realizing the general nth-order transfer functions are given in this article, which use a minimum number of capacitors and (n − + 1) amplifiers.
Abstract: Using signal–flow graphs, current differencing amplifiers circuits realizing the general nth-order transfer functions are given. These realizations use a minimum number of capacitors and (n + 1) current differencing amplifiers.
13 citations
TL;DR: In this paper, a new method for the computation of the state and output equations is given, and a procedure is described to obtain the switching equations, in the most general form, at a switching instant.
Abstract: The state–space formulation of linear circuits containing periodically operated switches requires one to obtain the state and output equations. Further, it requires one to obtain the switching equations where discontinuities in the state variables occur at a switching instant. A new method for the computation of the state and output equations is given. Further, a procedure is described to obtain the switching equations, in the most general form, at a switching instant. Examples are given to illustrate these methods in finding the state, the output and the switching equations.
12 citations
TL;DR: Morphological evidence is given for the concrement formation encountered in the rat pineal gland, the occurrence of which has not been reported so far (for the rat).
Abstract: Morphological evidence is given for the concrement formation encountered in the rat pineal gland, the occurrence of which has not been reported so far (for the rat).
8 citations
TL;DR: Using a modified model for SCR elements, this paper has adopted the stiffly stable algorithm, given by Gear, in the digital computation of the SCR circuits, and it is shown that the numerical integration problem can be solved without any fictitious components or changing the structure of the system.
TL;DR: Dogu kayini (Fagus orientalis Lipsky.) nin Turkiye'de cesitli yorelerde olusan odunlari uzerine anatomik arastirmalar.
Abstract: Dogu kayini (Fagus orientalis Lipsky.) nin Turkiye'de cesitli yorelerde olusan odunlari uzerine anatomik arastirmalar
TL;DR: In this paper, the authors studied the problem of an infinite elastic medium having a semi-infinite crack and a finite crack on two radial lines, and formulated the problem by using two bonded wedges having a dislocation.
TL;DR: It is postulated that these structural changes observed in the glomeruli were not associated with the extrarenal effects of heparin but that they could be related to its cyto-hormonal action upon the epicytes and mesangial cells.
TL;DR: In this paper, the controllability of a linear, time-invariant system is examined by reducing the system equations into their canonical form or by using the controLLability (observability) matrix.
Abstract: The controllability (observability) of a linear, time-invariant system is examined by reducing the system equations into their canonical form or by using the controllability (observability) matrix. To reduce into the canonical form requires row as well as column operations and consequently the original variables are not preserved. The controllability. (observability) matrix gives little information about the system as compared to its size and its construction. In this paper the controllability (observability) of a system is examined by the use of algebraic equations contained in the zero-state Laplace transform of state equations and an algorithm which only requires elementary row operations on real matrices is given to derive these algebraic equations. Besides providing an explicit explanation of controllability (observability) and displaying the structural properties of a system, these algebraic equations give a transformation which requires no matrix inversion and which leaves the controllable (observable) states invariant when reducing the system into its canonical form. The algorithm is still valid when the coefficient matrix of X(t) is not the identity matrix in the state equations. Therefore, in order to apply the algorithm matrix inversion is not needed when a change of variables takes place.