Showing papers by "Atatürk University published in 1993"
TL;DR: The performance of prompt, individualized surgical treatment in conjunction with the use of advanced measures of critical care to combat the disastrous consequences of multiple organ failure would contribute greatly to improve survival rate in victims of this dreadful entity.
Abstract: PURPOSE: The high mortality associated with ileosigmoid knotting prompted us to review the collected experiences of three university hospitals in order to establish a more rational approach to the problem. METHOD: The clinical records of 68 patients with ileosigmoid knotting from 1970 to 1990 were reviewed with respect to incidence, etiopathogenesis, clinical features, treatment, and clinical outcome. RESULTS: The most common type of ileosigmoid knotting was Type IA (48.5 percent), in which the active ileum encircled the passive sigmoid in a clockwise manner. Fifty (73.5 percent) patients developed a gangrenous bowel whereas 18 patients did not show any definite evidence of impairment of bowel viability.En bloc
removal of gangrenous knot and reestablishment of intestinal continuity by enteroenteric or enterocolic anastomosis combined with the Hartmann procedure, which was employed in 20 (42.6 percent) cases, constituted the most frequently preferred operation. The mortality rate in this series was 30.9 percent (21/68) and toxic shock, which ultimately resulted in multiple organ failure, was the major cause of death. It was remarkable to note that there was an inverse correlation between the duration of symptoms and the mortality rate reflecting the dramatic rapidity and severity of symptoms due to tightness of the knot which led to early and extensive gangrene, thus inevitably urged the patients to seek medical help without delay. CONCLUSION: The performance of prompt, individualized surgical treatment in conjunction with the use of advanced measures of critical care to combat the disastrous consequences of multiple organ failure would contribute greatly to improve survival rate in victims of this dreadful entity.
83 citations
TL;DR: Transhiatal esophagectomy, which can be performed in almost all levels of the esophagus, is the safer of the two operations.
69 citations
TL;DR: It was concluded that the left to right asymmetry in hand speed may depend on efficiency of the right brain in left-handed males, and nonverbal spatial reasoning ability may directly associated with the efficiency of left brain, which is favored by testosterone in male left-handers.
Abstract: The relationships among nonverbal intelligence, hand speed, and serum testosterone level were studied in male left-handers ranging in age from 17 to 19 years. Hand speed was measured by a peg movin...
47 citations
TL;DR: In this article, the performance of a solar-assisted heat pump system with energy storage for residential heating in the Black Sea region of Turkey, an experimental setup was constructed, consisting of flat plate solar collectors with total area of 30 m2, a laboratory building with 75 m2 floor area for heating purpose, a latent heat thermal energy storage tank filled by 1500 kg encapsulated phase change material (PCM), a heat pump with double evaporators (air-sourced and watersourced) and one condenser, a water circulating pump, and measuring equipments.
45 citations
TL;DR: The cyst stage of Echinococcus granulosus is commonly located in the liver, which frequently results in a long symptomless period, but a sudden death following blunt trauma to the liver in a 19-year-old boy is presented.
Abstract: The cyst stage of Echinococcus granulosus is commonly located in the liver, which frequently results in a long symptomless period. We present a sudden death due to a freshly hemorrhagic hydatid cyst following blunt trauma to the liver in a 19-year-old boy. The possible mechanism was thought to be an anaphylactoid reaction to the leakage of the cyst fluid.
38 citations
TL;DR: All components of hydatid cysts in the heart and lungs were removed in the same session by median sternotomy and Extracorporeal bypass was used in this operation.
Abstract: A 23-year-old man had been coughing with hemoptysis, and had received tuberculostatic medication for four months without any benefit. Upon referral, two-dimensional echocardiography showed a cystic mass located in the anterior right-ventricular wall, without any protrusion into the ventricular cavity. CT examination revealed three cysts in the lung fields bilaterally, additionally a multilocular cystic image in the right-ventricular wall was observed. All components of hydatid cysts in the heart and lungs were removed in the same session by median sternotomy. Extracorporeal bypass was used in this operation.
36 citations
TL;DR: In this article, an examination of the rectification properties of organic conductor/inorganic semiconductor/metal Schottky diodes has been made, in which freshly prepared polythiophene has been used as metal, and n-Si and nGaAs as semiconductors.
Abstract: An examination of the rectification properties of organic conductor/inorganic semiconductor/metal Schottky diodes has been made, in which freshly prepared polythiophene has been used as metal, and n-Si and n-GaAs as semiconductors. Polythiophene films were electrochemically obtained on glass substrates covered with Au in acetonitrile/0.25 M LiClO 4 solution. The metallic polythiophene polymer has provided a good rectifying contact to the n-Si and n-GaAs semiconductors. The processing and I-V and C-V measurements of the devices were done at room temperature in laboratory atmosphere. The forward I-V characteristics of the metallic polythiophene/n-Si and the metallic polythiophene/n-GaAs Schottky diodes have exhibited ideality factors of 2.40 and 2.69, respectively. However, values obtained for the barrier height of these Schottky diodes could be sufficient for many device applications. In addition, the work function of the polythiophene was determined as 4.81 eV.
29 citations
TL;DR: In this paper, the authors measured the Kβ/Kα X-ray intensity ratios for pure Cr, Mn, Co and Cu belonging to the 3D shell as well as in their compounds, to look for the influence of the chemical environment on the fluorescence yield ratios.
Abstract: The Kβ/Kα X-ray intensity ratios were measured for pure Cr, Mn, Co and Cu belonging to the 3 d shell as well as in their compounds, to look for the influence of the chemical environment on the fluorescence yield ratios. The vacancies in the K shell created by 59.5 keV γ-rays from an241Am source and the X-rays were measured using a Ge(Li) detector. A steady increase of the Kβ/Kα intensity ratio was observed with increasing oxidation. The present results agree with previously published experimental data.
29 citations
TL;DR: In this paper, the β-Sn single crystals used in this study were melted and grown by the modified Bridgman technique under a vacuum of 10-3 Torr, and oriented by the back-reflection Laue method.
Abstract: The β-Sn single crystals used in this study were melted and grown by the modified Bridgman technique under a vacuum of 10-3 Torr, and oriented by the back-reflection Laue method. By applying the tensile test to the crystals whose orientations were determined, operative slip systems were found, and the relation between the crystals orientation and the slip systems was investigated. Where the crystal orientation was deviated from [110] direction, the slip systems were also changed and hence it was seen that slip modes depend on the direction of applied stress.
28 citations
TL;DR: Two new species, Zercon ozkani and Zercon turcicus, are described from Turkey and are described as new species of Zercon.
Abstract: Two new species, Zercon ozkani and Zercon turcicus, are described from Turkey. Illustrations are also given.
20 citations
TL;DR: The extract, caffeine and crude fibre contents of black tea, from different shooting periods, different times within each shooting period and processed by five different commercial rolling methods, were examined and it was determined that processing methods did not have a significant effect on the caffeine content.
Abstract: The extract, caffeine and crude fibre contents of black tea, from different shooting periods, different times within each shooting period and processed by five different commercial rolling methods, were examined. The extract and crude fibre contents of black tea were significantly (P<0.01) affected by all these factors and their interactions. The caffeine content of black tea was affected by the shooting period and times within the shooting period. It was determined that processing methods did not have a significant (P<0.05) effect on the caffeine content. The amount of extract and caffeine decreased from the first shooting period to the third, and also from the beginning of each shooting period to the end. However, the crude fibre content of the black tea increased, especially from the beginning of each shooting period to the end of each shooting period.
TL;DR: It was concluded that fast conducting neuromuscular junctions on the right hand muscles would contribute to relatively fast right hand in right-handers.
Abstract: Lateralization in the sensory and motor nerve conduction velocities was studied in right-handed normal subjects. The nerve conduction velocities (NCVs) were measured in hands. Sensory NCVs were found to be higher on the left hand than the right hand. The motor NCVs did not show a statistically significant difference between the right and left hands. However, the motor conduction velocity measured from median nerve to the action potential from abductor pollicis brevis muscle was found to be significantly higher in the right hand than the left hand. It was concluded that fast conducting neuromuscular junctions on the right hand muscles would contribute to relatively fast right hand in right-handers. Relatively fast conducting sensory nerves in the left hand may contribute to a relatively better perception by the right cerebral hemisphere in right-handers.
TL;DR: The results suggested that a detailed questionnaire such as the Waterloo Handedness Questionnaire would be more appropriate than concise questionnaires in assessing hand preference and supports the concept of anomalous dominance for left-handedness.
Abstract: The distribution of hand preference was studied in human subjects by means of The Waterloo Handedness Questionnaire and Edinburgh Handedness Inventory. The Waterloo Handedness scores (WS) and Geschwind Scores (GS) were estimated. Left-handers (WS 0; GS > 0) constituted separate groups (dichotomy). The WSs, and to a lesser extent GSs, were distributed normally when only the right-handers were considered. There was a significant positive-linear correlation between WSs and GSs. These results suggested that a detailed questionnaire such as the Waterloo Handedness Questionnaire would be more appropriate than concise questionnaires in assessing hand preference. A normally distributed right-hand preference and a widely dispersed left-hand preference also supports the concept of anomalous dominance for left-handedness.
TL;DR: It was concluded that the XRF system could be effectively used for quantitative analysis of the K and Ca content of tea samples and its simplicity, high throughput and the possibility of automation make it useful for screening large numbers of samples.
Abstract: X-Ray fluoresence (XRF) can be successfully used for the qualitative and quantitative elemental analysis of various agricultural products. Its simplicity, high throughput and the possibility of automation make it useful for screening large numbers of samples. The K and Ca content of 138 samples of fresh green tea, black tea and black tea residues were determined by applying the XRF system. Such a method of mineral analysis of food products is not very common. Tea from different teagrowing areas of Turkey, green tea of different shooting periods, black tea processed at different tea plants and tea residues from these black tea were analysed. The K content of green tea, processed black tea and tea residues after brewing were found to have ranges of 19,049–26,254 mg/kg, 21,904–26,883 mg/kg and 9,468–13,778 mg/kg, respectively. In the same samples the Ca content was determined as 3,580–4,799 mg/kg, 3,370–4,823 mg/kg, and 3,743–5,733 mg/kg, respectively. These findings were compared with the results of atomic emission techniques and it was concluded that the XRF system could be effectively used for quantitative analysis of the K and Ca content of tea samples.
TL;DR: A model was developed by applying a continuity equation to the air control volume over Erzurum city centre, which allows estimation of daily polluting concentrations by means of meteorological data.
TL;DR: In this paper, chemical effects on the Kβ/Kα X-ray intensity ratios were investigated for different constitutions of Ti, V, Fe, Se, Br, Zr, and Ce by a Ge(Li) Xray detector.
Abstract: Chemical effects on theKβ/Kα X-ray intensity ratios were investigated for different constitutions of Ti, V, Fe, Se, Br, Zr and Ce by a Ge(Li) X-ray detector. The vacancies were produced by heavily filtered241Am gamma-rays. It is found that theKβ/Kα X-ray intensity ratios measured with compounds deviated up to 12% from the corresponding values of the pure elements (Ti, V, Fe) are larger than for the others (Se, Br, Zr and Ce).
Journal Article•
TL;DR: Thirty-two cases of urinary vaginal fistulas treated surgically at the Department of Gynaecological Surgery between 1985 and 1991 have been reviewed retrospectively.
Abstract: Thirty-two cases of urinary vaginal fistulas treated surgically at our Department between 1985 and 1991 have been reviewed retrospectively. There were 26 cases of vesicovaginal fistulas, 1 case of urethrovaginal fistula and 5 cases of ureterovaginal fistulas. Gynaecological surgery was the leading cause of the fistulas (24/32). Eight cases of vesicovaginal fistulas and 1 case of urethrovaginal fistula were repaired transvaginally, with 88.8 per cent success. Seventeen cases of vesicovaginal fistulas were repaired by suprapubic transvesical approach, with 88 per cent success at the first attempt and 94 per cent success at 2 attempts. One patient with vesicovaginal fistula underwent ureterosigmoidostomy. Ureterovaginal fistulas were repaired successfully by simple ureteroneocystostomy in 4 cases and 1 case of ureterovaginal fistula required ureteric substitution with a Boari bladder flap.
TL;DR: Two cycloheptatriene derivatives 8 and 9 react with benzyne to give adducts 10−12 having anti benzhomobarrelene geometry as discussed by the authors. And the endoconfiguration of benzoquinone ring in 13 was confirmed by photochemical (2+2)-cycloaddition to give the cagemolecule
Journal Article•
TL;DR: Serum Zn(2+) levels were determined in the serum samples obtained from 100 healthy subjects, 10 patients with cirrhosis, 12 diabetic patients and 15 patients with chronic renal failure by this enzymatic method and by atomic absorption for comparison.
Abstract: In this study, serum Zn(2+) content was determined by a new enzymatic method. The method depends on the reactivation of apocarbonic anhydrase proportional to the Zn(2+) content of the sample. Carbonic anhydrase was purified from bovine erythrocytes by affinity chromatography. The Zn(2+) in its structure was removed by dialysis against pyridine 2,6-dicarboxylic acid, resulting in a pure apoenzyme with a yield of 100%. The activity of the enzyme was determined by its esterase effect on 4-nitrophenyl acetate. Zn(2+) levels were determined in the serum samples obtained from 100 healthy subjects, 10 patients with cirrhosis, 12 diabetic patients and 15 patients with chronic renal failure by this enzymatic method and by atomic absorption for comparison. There was a good correlation between the two methods in all patients and controls and intraassay CV% was 2.4 and 4.2 for enzymatic and atomic absorption methods, respectively and interassay CV% as 3.9 and 6.1 respectively.
TL;DR: In this article, the rotating disc method was used to investigate the kinetics of dissolution of Trona, Na 2 CO 3 ·NaHCO 3 ·H 2 O, in NaOH solution.
TL;DR: The results suggest that mainly the genetic and hormonal factors may play an important role in emergence of motor asymmetry in cats.
Abstract: The distribution of the right minus left (R - L) paw use and its relation to hemispheric weight was studied in tortoise-shell cats. Paw preference was assessed by a food reaching test. All males (N = 9) were left-preferent; females (N = 13) were predominantly right-preferent. There was an inverse relationship between the degree of left-paw preference and the right-brain weight in males (no correlation with left-brain weight). In females, the R - L paw use showed a negative linear correlation with the right- and left-brain weights: the right-pawedness decreased and the left-pawedness increased as the right-and left-brain weights increased. The distributions of the R - L paw use as well as the relationships between brain-weight and pawedness exhibited sexual dimorphism. The results suggest that mainly the genetic and hormonal factors may play an important role in emergence of motor asymmetry in cats. Annett's right shift theory of handedness was also discussed in light of these results
TL;DR: Water distillation of the air-dried aerial parts of Micromeria fruticosa subsp. serpyllifolia yielded 0.65% essential oil containing pulegone (33.4%), piperitenone (3.1%), and piperine (1.1%) as main constituents.
Abstract: Water distillation of the air-dried aerial parts of Micromeria fruticosa subsp. serpyllifolia yielded 0.65% essential oil containing pulegone (33.4%) and piperitenone (33.1%) as main constituents. Forty-nine constituents making up 93% of the oil were identified by GC and GC/MS analysis.
Journal Article•
TL;DR: It is concluded that especially giant aneurysms in children should be treated surgically without exercising hypotension during operation.
Abstract: 10 giant intracranial aneurysms in children were treated consecutively in Neurosurgical Department of Ataturk University, Erzurum, Turkey between 1985-1989. A total of 60 aneurysms of normal size were operated on in the same period. Of the ten cases 6 were male and 4 were female. All the patients were under 17-years old. In 6 cases, the onset of symptoms was sudden subarachnoid hemorrhage, in 3 cases presenting symptoms were insidious imitating a intracranial mass, and in one case, clinical manifestation was epileptic seizure. Among 6 cases with subarachnoid hemorrhage, 3 were in IV grade according to Hunt-Hess scale, 2 were in III grade and one in II grade. Angiographic localisation of the aneurysms was in the middle cerebral artery in 9 cases and in the anterior communicating artery in one case. During the operation, blood pressure was not lowered. All the patients were operated on with normal blood pressure without hypotension. In 4 cases, intramural thrombosis was detected. The necks of aneurysms were occluded by suitable clips. The aneurysms were excised in 4 cases after clipping. One patient died in the early postoperative period, and 9 cases remained alive and were free of symptoms after the operation for one to 4 years. We conclude that especially giant aneurysms in children should be treated surgically without exercising hypotension during operation.
TL;DR: In this paper, photooxygenation of 2 in the presence of thiourea resulted in the formation of diketone 8 and ketal 7 ; the later presumably derived from incorporation of the solvent molecule.
TL;DR: It was concluded that nonverbal intelligence largely depends on speed of information processing only by the right brain, not by the left brain in left-handed male subjects, and inconsistencies in the IQ literature concerning the speed hypothesis of intelligence may be explained by differences in cerebral lateralization.
Abstract: The relationships between latencies of visual evoked potentials (VEPs) and nonverbal intelligence test scores (IQs from Cattell's Culture Fair Intelligence Test) and correlations between serum testosterone level and VEP latencies were studied to examine the neural speed hypothesis of intelligence and its hormonal mechanisms in left-handed male subjects (Geschwind Scores). In accordance with the speed theory of intelligence, N1 and P1 latencies (and amplitudes) were found to be inversely related to IQ. However, this was true only for the right brain; the left brain did not contribute to this relationship. There was an inverse relationship between serum testosterone level and P1 latency; left minus right N1 latency, depending on N1 latency from right brain, linearly increased with testosterone. It was concluded that nonverbal intelligence largely depends on speed of information processing only by the right brain, not by the left brain in left-handed male subjects. This may have been created by testosterone in these subjects. Inconsistencies in the IQ literature concerning the speed hypothesis of intelligence may be explained by differences in cerebral lateralization.
TL;DR: The observed higher total risk of hip fracture in the rural areas of Turkey primarily can be explained by a larger proportion of high-energy fractures in the Rural areas, whereas the risk of low- energy fractures seems to be similar.
TL;DR: It was concluded that right brain controlling left hand in left-handers has a higher capacity than left brain for motor learning; L-R hand speed was largely determined by left brain; accuracy in hand skill depends on both brains in females, and on only left brain in males.
Abstract: Speed and accuracy in hand speed in relation to sex-related differences were studied in left-handed normal subjects. Hand skill was assessed by a peg moving task. Hand speed increased linearly with successive trials (motor learning). Left-hand speed exhibited a higher learning capacity than right-hand speed. Right-hand speed and right-hand learning were equivalent in males and females. Left-hand speed was higher in females than males; left-hand learning was equivalent in males and females. Left minus right (L-R) hand speed decreased linearly with right-hand speed; left-hand speed did not influence L-R hand speed. Learning curves were constructed for each subject. Standard error of a learning curve was considered as accuracy of hand skill. In females, accuracy of hand movement decreased as hand speed increased. In males, only accuracy of right-hand speed decreased as right-hand speed increased; left-hand accuracy did not depend on left-hand speed. It was concluded that right brain controlling left hand in left-handers has a higher capacity than left brain for motor learning; L-R hand speed was largely determined by left brain; accuracy in hand skill depends on both brains in females, and on only left brain in males; the female brain is more bilaterally organized than male brain in fine motor control.
TL;DR: The relationship between the degree of right-hand preference and serum free-testosterone level was studied in right-handed female subjects and suggested a trophic effect of testosterone especially on the left cerebral cortex in females.
Abstract: The relationship between the degree of right-hand preference and serum free-testosterone level was studied in right-handed female subjects, who were 17–19 years old. It was assumed that free testosterone levels in serum of young female subjects would reflect the perinatal testosterone levels. Hand preference was assessed by the Edinburgh Handedness Inventory (Geschwind score, GS) and Waterloo Handedness Questionaire (Waterloo score, WS). The degree of the right-hand preference linearly and significantly increased as the serum free-testosterone level increased in the moderately right-handed (GS = 70). These results only partly supported the testosterone hypothesis of cerebral lateralization that testosterone would slow the growth of the left cerebral hemisphere, reducing the degree of right hand preference. The results also suggested a trophic effect of te...
TL;DR: It was concluded that visuomotor control by the left brain would be the main biological correlate of left-hand preference with regard to sensorimotor and cognitive functions.
Abstract: The relation of the degree of left-hand preference to pattern reversal visual evoked potentials (VEPs) from right and left brain was studied in male left-handers. The degree of the left-hand preference was assessed by the Waterloo Handedness Questionnaire. Visual stimuli consisted of black and white checkerboard patterns generated on a TV screen. VEPs were simultaneously recorded from occipital leads of the right and left hemispheres. The degree of left-hand preference was found to be inversely and significantly related to size of VEPs only from left brain, not from right brain. That is, the conduction time, amplitude, duration, and area of N1-P1 waves linearly decreased as the degree of left-hand preference increased. These results were in accord with the testosterone hypothesis of cerebral lateralization, but not compatible with the right shift theory of handedness. It was concluded that visuomotor control by the left brain would be the main biological correlate of left-hand preference with regard to sensorimotor and cognitive functions.
TL;DR: It was concluded that the human brain is not unique in SF asymmetries, which may be linked to manual asymmetry and sex hormones.
Abstract: The height of the end point of the sylvian fissure (SF) was analyzed in the right and left brains of male and female adult cats. A corrected SF asymmetry coefficient (AC) was computed for each brai...