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Crystal structure, optical characterization, conduction and relaxation mechanisms of a new hybrid compound (C 6H 9N 2) 2[Sb 2Cl 8]. RSC Adv 2024; 14:3588-3598. [PMID: 38264272 PMCID: PMC10804228 DOI: 10.1039/d3ra08885e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 01/16/2024] [Indexed: 01/25/2024] Open
Abstract
Hybrid materials play a crucial role in the construction of flexible electronic devices due to the advantages of both organic and inorganic components. To this end, a new hybrid compound (C6H9N2)2[Sb2Cl8] was successfully fabricated using the slow evaporation solution growth approach at room temperature. In-depth research has been done on the structural, optical, and dielectric characteristics. This compound adopts the triclinic symmetry and crystallizes in the centrosymmetric space group P1̄. The inorganic and organic components respectively form anionic and cationic layers parallel to the ac-plane and alternate along the crystallographic b-axis. The [Sb2Cl8]2- dimeric units are bound to the 2-amino-5-picolinium cations [(C6H9N2)]+ through N-H⋯Cl hydrogen bonds. Optical absorption measurements showed a semiconductor behavior with a band gap of approximately 3.57 eV. In addition, DFT calculations were performed to investigate the absorption spectrum, wavelength, and HOMO-LUMO gap. The analysis of complex impedance spectra shows that the electrical conductivity of the sample is strongly frequency and temperature dependent, indicating a relaxation phenomenon and semiconductor-type behavior. Dielectric data obtained from complex impedance spectroscopy and ac conductivity with the use of the Maxwell-Wagner equivalent circuit model, and the universal power law have been investigated to explore the basic components of the electronic transport and relaxation process in our material.
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Crystal structure and optical characterization of a new hybrid compound, C 6H 9N 2FeCl 4, with large dielectric constants for field-effect transistors. RSC Adv 2023; 13:12844-12862. [PMID: 37114024 PMCID: PMC10126822 DOI: 10.1039/d3ra01239e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
Due to remarkable dielectric features, such as a large dielectric constant, strong electrical conductivity, high capacitance, and low dielectric loss, hybrid materials have lately seen a huge number of applications in the field of optoelectronics. These are critical characteristics that qualify the performance of optoelectronic devices, particularly field-effect transistor components (FETs). Here, the hybrid compound 2-amino-5-picoline tetrachloroferrate(iii) (2A5PFeCl4) was synthesised by using the slow evaporation solution growth method at room temperature. Structural, optical, and dielectric properties have been investigated. The 2A5PFeCl4 compound crystallises in the monoclinic system (P21/c space group). Its structure can be described as a successive layering of inorganic and organic parts. [FeCl4]- tetrahedral anions and 2-amino-5-picolinium cations are connected by N-H⋯Cl and C-H⋯Cl hydrogen bonds. The optical absorption measurement confirms the semiconductor nature with a band gap of around 2.47 eV. Additionally, the structural and electronic properties of the title compound have been investigated theoretically through DFT calculations. At low frequencies, this material has significant dielectric constants (ε ∼106). Furthermore, the high electrical conductivity, low dielectric loss at high frequencies, and high capacitance show that this new material has great dielectric potential in FET technologies. Due to their high permittivity, these compounds can be employed as gate dielectrics.
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Investigation of structural and ionic conductivity in the new organic-inorganic bromide:[(C3H7)4P]2Cd2Br6. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Investigation of optical and electrical properties of the semiconducting α-KZnPO 4 compound. RSC Adv 2022; 12:6831-6840. [PMID: 35424600 PMCID: PMC8981540 DOI: 10.1039/d2ra00426g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 02/23/2022] [Indexed: 11/23/2022] Open
Abstract
We used the solid state method to synthesize the α-KZnPO4 compound. The X-ray diffraction pattern revealed that the sample represents a single hexagonal phase with a P63 space group. The chemical composition of the compound was examined by energy dispersive spectroscopy. The optical absorption measurement confirmed the semiconductor nature of the compound with a band gap around 4.52 eV. Furthermore, the electrical properties of the material were analyzed by means of the impedance spectroscopy, in a frequency range from 100 Hz to 1 MHz and a temperature range from 583 K to 673 K. The dependency of s(T) on temperature showed that the overlapping large polaron tunneling model is the mechanism responsible for AC conduction in the compound. A correlation between the crystal structure and the ionic conductivity was established and discussed. Finally, the temperature variation of M′′ peak showed a thermally activated relaxation process and a temperature-dependent stretching exponent β parameter. We used the solid state method to synthesize the α-KZnPO4 compound.![]()
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Synthesis, structural and electrical characterization of a new organic inorganic bromide: [(C 3H 7) 4N] 2CoBr 4. RSC Adv 2022; 12:2798-2809. [PMID: 35425329 PMCID: PMC8979218 DOI: 10.1039/d1ra07965d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 01/04/2022] [Indexed: 11/21/2022] Open
Abstract
A new organic inorganic hybrid [TPA]2CoBr4, where TPA = [(C3H7)4N]+ (i.e., tetra-propyl-ammonium) compound has been synthesized by slow evaporation method at room temperature. Single crystal X-ray diffraction (SC-XRD), X-ray powder diffraction (XRPD), thermal analyses, vibrational and complex impedance spectroscopy have been used to characterize both structural, thermal, electrical properties. [TPA]2CoBr4 crystallizes in the monoclinic system (C2/c space group) with the following cell parameters: a = 33.145 (5) Å, b = 14.234 (3) Å, c = 15.081 (2) Å and β = 110.207 (5)°. In the crystal structure, the organic TPA cations which form layers stacked along the a-axis, are separated from each other by inorganic tetrahedral [CoBr4]2- anions. The XRPD pattern confirms both the high purity of the sample and the crystalline nature of the powder. The differential scanning calorimetry (DSC) analysis shows an endothermic peak at 394 K upon heating which is ascribed to a structural phase transition since no decomposition of the titled compound is evidenced by thermogravimetric analysis. The ac conductivity and the dielectric properties confirm the presence of the phase transition. At the structural phase transition around 394 K, a change from a quantum mechanical tunneling to a correlated barrier hopping conduction models is determined from the temperature dependence of the exponent s of the Jonscher's power law. The analysis of complex impedance spectra shows that the electrical properties of the material are heavily dependent on frequency and temperature, indicating a relaxation phenomenon and semiconductor-type behavior. One single semicircle is detectable in the Nyquist plots of the complex impedance spectra which can be satisfactorily fitted with a combination R//CPE elements assigned to the bulk response. This behavior suggests that the sample is electrically homogeneous. Capacitance analysis proves the high effective permittivity at radio frequencies in the sample.
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AC conductivity and phase transition of the BST–BFO ceramic doped with Yb. RSC Adv 2022; 12:27154-27161. [PMID: 36276054 PMCID: PMC9511099 DOI: 10.1039/d2ra03371b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 09/08/2022] [Indexed: 11/21/2022] Open
Abstract
The homogeneity of the 0.8(Ba0.8Sr0.2)TiO3–0.2(Bi0.85Yb0.15)FeO3 ceramic, prepared by a solid-state process, was studied and quantitatively analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). At ambient temperature, X-ray diffraction shows the existence of only one perovskite phase in the tetragonal structure with the space group P4mm. The thermal variations of (real part of the dielectric permittivity) for this composition show extended peaks with temperature; this broadening of the peaks can be attributed to the diffuse character of the transition. As the frequency increases, Tm (temperature of maximum permittivity) moves at higher temperatures, and the maximum values of decrease. Moreover, the impedance spectra (−Z′′ vs. Z′) show the presence of two arcs of circles that have been modeled with an equivalent electrical circuit. The arcs of the circles centered under the real axis (Z) prove the Cole–Cole-type behavior. Each circle is associated with either the grain effect or grain boundaries. Electrical modulus analysis shows that the capacitance of the ceramic is enhanced, which is in good agreement with the results of complex impedance analysis. The AC conductivity complies with the universal power law. It disputes the modification of AC conductivity by adopting the Arrhenius-type of electrical conductivity. The temperature dependence of alternating current conductivity (σg) and direct current conductivity (σDC) confirms the existence of the ferroelectric–paraelectric phase transition. The homogeneity of the 0.8(Ba0.8Sr0.2)TiO3–0.2(Bi0.85Yb0.15)FeO3 ceramic, prepared by a solid-state process, was studied and quantitatively analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX).![]()
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Studies on structural, dielectric and optical properties of (Ba 0.95Ca 0.05) 1-x (Ti 0.8Sn 0.2) 1-x Na x Nb x O 3 lead-free ceramics. RSC Adv 2021; 11:14504-14512. [PMID: 35423971 PMCID: PMC8698151 DOI: 10.1039/d1ra00952d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 04/04/2021] [Indexed: 11/21/2022] Open
Abstract
(Ba0.95Ca0.05)1-x (Ti0.8Sn0.2)1-x Na x Nb x O3 (BCNTSNO3) lead-free ceramics with compositions (x = 0.75, 0.8 and 0.85) were synthesized through the traditional solid-state reaction method. X-ray powder diffraction analysis showed the formation of a single phase compound crystallized in tetragonal space group P4mm. The evolution of Raman spectra displayed a disorder introduced into the structure, which favors a ferroelectric relaxor behavior. The dependence of the dielectric properties on temperature exhibited two composition ranges with different behaviors. Ferroelectric relaxor properties were observed for the compositions x < 0.85 and the classical ferroelectric behavior for x = 0.85. Lead free (Ba0.95Ca0.05)1-x (Ti0.8Sn0.2)1-x Na x Nb x O3 ceramics exhibited larger dielectric constants than those of parent crystal NaNbO3, suggesting that it is a good candidate for lead-free ceramics in several industrial applications. Using UV-Vis spectroscopy, the optical band gap energy of ceramics (Ba0.95Ca0.05)1-x (Ti0.8Sn0.2)1-x Na x Nb x O3 is found at 2.89, 2.92, and 3.05 eV for x = 0.75, 0.8 and 0.85, respectively.
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Hirshfeld surface, RMN study, optical properties and dielectric behavior of tetrabutylphosphonium tetrachloroantimonate(III) hybrid. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2021. [DOI: 10.1007/s13738-021-02203-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Urological activity at the time of COVID-19 pandemic: is there any difference between public and private field? Pan Afr Med J 2020; 37:389. [PMID: 33796202 PMCID: PMC7992421 DOI: 10.11604/pamj.2020.37.389.25297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 12/12/2020] [Indexed: 12/19/2022] Open
Abstract
Introduction as COVID-19 pandemic is rapidly evolving, there is a whole reorganization in hospitals to concentrate more resources to face the crisis. The purpose of this study is to evaluate the impact of COVID-19 disease on urological activity in Tunisia. To assess the differences in the management of urological conditions between the private and the public field. Methods a survey was addressed to all certified urologists working in Tunisia in both the public and private sectors (n=194) using the national database of active urologists available and updated. We either called them or looked them up through email or social media. The form was open from March the 28th to April the 3rd. Results were obtained via spreadsheet and analysed using SPSS 23.0. Results one hundred and twenty urologists have filled in the form. Consultations at the outpatient office were restricted to urgent cases in 66% (n=79). Telemedicine was more used by urologists in private than in public fields p=0.03. Urologists in private sector followed more the sterilization protocol of the hospital/clinic and used more disposable materials whenever possible p=0.011. Elective surgical activity has completely stopped in 85% of the responders (n=102). Elective surgery requiring transfusion or intensive care unit was performed in 38% (n=46) and 26% (n=31) if there was a risk of disease progression. Benign Prostate Hyperplasia (BPH) surgery was more performed as usual in private sector than in public sector p=0.012. It was the only condition managed differently between both sectors. Conclusion the drop of the urological activity is essential in order to give relevant stakeholders room to act efficiently against the spread of the virus. The context of the pandemic and the hospital´s condition must be taken into consideration without compromising the patient´s outcome.
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Évaluation de la prise en charge des patients sous sondage intermittent propre par les médecins généralistes. Prog Urol 2020. [DOI: 10.1016/j.purol.2020.07.195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Enquête nationale sur la pratique de la surveillance active pour cancer de la prostate en Tunisie. Prog Urol 2020. [DOI: 10.1016/j.purol.2020.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Endoscopic meatotomy in the treatment of ureterocele: results in adult patients. Pan Afr Med J 2020; 36:243. [PMID: 33014239 PMCID: PMC7519792 DOI: 10.11604/pamj.2020.36.243.24941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 07/20/2020] [Indexed: 11/12/2022] Open
Abstract
To evaluate the efficacy of endoscopic meatotomy in the treatment of ureterocele in adults. A retrospective study of adult patients with ureterocele, treated between January 1987 and December 2014. In 47 patients, 55 intravesical ureteroceles were diagnosed and classified as 18 right, 21 left and eight bilateral (38%, 44% and 17% respectively). According to the Bruézière classification, 41 (75%) ureteroceles were type A and 14 (25%) others were type C. These ureteroceles were complicated by calculus formation in 22 cases, moderately dilated excretory pathways in 16 cases and both complications in a total of 9 cases. Four patients had a complicated ureterocele with pyelonephritis, one of which was emphysematous. The endoscopic treatment was performed in cases of complicated and/or symptomatic ureteroceles. Fifty one cases were treated by a “smiling mouth” meatotomy consisting in a transverse horizontal incision, with the treatment of any associated complication. The mean operative time was 35 minutes (10-90). The operative follow-up was uneventful in 42 patients and complications occurred in 5 patients (2 urinary retentions, 2 infectious complications and one hematuria). The mean duration of postoperative stay was 1-2 days. The mean follow-up was 15 months. Four patients developed vesicoureteral reflux and no stenosis was noted. The endoscopic incision of the ureteroceles seems today, after reviewing the results, to be a good treatment of adult ureterocele. It is a simple, minimally invasive and has a low morbidity rate.
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Infected urachal cyst in an adult: A case report. Urol Case Rep 2019; 26:100976. [PMID: 31380223 PMCID: PMC6661533 DOI: 10.1016/j.eucr.2019.100976] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/20/2019] [Accepted: 07/22/2019] [Indexed: 11/30/2022] Open
Abstract
The urachus is an embryologic remnant which degenerates after the birth. An infected urachal cyst is one of a spectrum of presentations of urachal pathology, all of which are rare in adulthood. Infected urachal cyst is a rare pathology in adult women and it should be considered in the differential diagnosis of acute abdomen. We report here a case of a 50-year-old women with an infected urachal cyst reveled by an acute abdomen.
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Crystal structure, Hirshfeld surface analysis, Thermal study and Conduction mechanism of [(C 4H 9) 4P] 3Bi 2Cl 9compound. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.5078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Electrical conductivity and vibrational studies induced phase transitions in [(C 2H 5) 4N]FeCl 4. RSC Adv 2018; 8:40676-40686. [PMID: 35557925 PMCID: PMC9091414 DOI: 10.1039/c8ra07671e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 11/25/2018] [Indexed: 11/21/2022] Open
Abstract
The compound, tetraethylammonium tetrachloroferrate [(C2H5)4N]FeCl4, was prepared by slow evaporation at room temperature. It was characterized by X-ray powder diffraction, thermal analysis, and impedance and vibrational spectroscopy. X-ray diffraction data confirmed formation of a single phase material which crystallized at room temperature in the hexagonal system (P63 mc space group). DSC showed the existence of two phase transitions at 413 K and 430 K. Electrical conductivity was measured in the temperature and frequency ranges of 390 K to 440 K and 40 Hz to 110 MHz, respectively. Nyquist plots revealed the existence of grains and grain boundaries that were fitted to an equivalent circuit. AC conductivity plots were analyzed by Jonscher's power law. Variations in the "s" values indicated that CBH models describe the conduction mechanism in regions I and II. Temperature dependence of Raman spectra showed that the most important changes were observed in the cationic parts ([(C2H5)4N]+). The activation energy value obtained from the line width decreased which indicated an order-disorder model.
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Splenogonadal fusion - a rare cause of scrotal swelling: a case report. J Med Case Rep 2018; 12:172. [PMID: 29921313 PMCID: PMC6011191 DOI: 10.1186/s13256-018-1712-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 05/06/2018] [Indexed: 11/10/2022] Open
Abstract
Background Splenogonadal fusion is a rare and benign condition. Diagnosis is challenging for clinicians. Despite its indolence, diagnosis is often confirmed after orchidectomy. Surgery is mandatory, particularly to rule out the extremely rare association with malignancy. Case presentation We report a case of splenogonadal fusion in a 38-year-old North African man presenting a palpable scrotal mass. We describe clinical aspects, pathogenic hypothesis, radiological features, as well as surgical management principles. Conclusions Splenogonadal fusion is rarely suspected and diagnosed preoperatively. A diagnosis is made once an ectopic testicular mass is associated with cryptorchidism and suggestive radiological signs. A better knowledge of the clinical and radiological features of splenogonadal fusion provides an opportunity for conservative surgery.
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Vibrational spectroscopic and dielectric properties investigations of phase transitions in KMgPO 4 compound. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.07.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Density functional theory calculations of the molecular structure and the vibrational spectra of bis-tetrapropyl-ammonium hexachloro-dizincate. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.05.097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Assessment of genetic diversity of Tunisian orange, Citrus sinensis (L.) Osbeck using microsatellite (SSR) markers. GENETICS AND MOLECULAR RESEARCH 2016; 15:gmr6564. [PMID: 27323057 DOI: 10.4238/gmr.15026564] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Citrus are one of the most cultivated crops in the world. Economically, they are very important fruit trees in Tunisia. Little is known about the genetic diversity of the Tunisian Citrus germplasm. Exploring this diversity is a prerequisite for the identification and characterization of the local germplasm to circumvent and controlling genetic erosion caused by biotic and abiotic stress to aid its conservation and use. In the present study, we explored the genetic diversity of 20 Tunisian orange cultivars [Citrus sinensis (L.) Osbeck] and established their relationships by using seven simple sequence repeat (SSR) loci. In total, 37 alleles and 44 genotypes were scored. The sizes of alleles ranged from 90 to 280 bp. The number of alleles per locus was from 4 to 7, with an average of 5.28. Polymorphic information content value changed from 0.599 to 0.769 with an average of 0.675. Analysis of the genotypes revealed a heterozygote deficiency across all the genotypes. The observed heterozygosity varied from 0 to 1 (average of 0.671). Cluster analysis showed that three groups could be distinguished and the polymorphism occurred independently of the geographical origin of the studied orange cultivars. The detected SSR genotypes allowed the establishment of an identification key with a discriminating power of 100%. Multivariate analysis and the neighbor-joining phylogenetic tree indicated a narrow genetic base for the orange cultivars. The usefulness of SSR markers for orange fingerprinting and evaluation of the genetic diversity in the Tunisian germplasm are discussed in this paper.
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Abstract
Rubidium aluminium diphosphate was synthesized by a conventional solid-state technique and its conduction properties determined by impedance spectroscopy.
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Abstract
The structure of KMgPO4 is formed by six-membered rings of tetrahedral MgO4 and PO4, linked by common vertices and by large cavities that are occupied by K+ cations.
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Synthesis, crystal structure, thermal analysis and dielectric properties of [(C4H9)4N]3Bi2Cl9 compound. J SOLID STATE CHEM 2015. [DOI: 10.1016/j.jssc.2015.01.034] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Using Raman spectroscopy to understand the origin of the phase transitions observed in [(C₃H₇)₄N]₂Zn₂Cl₆ compound. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 145:223-234. [PMID: 25782180 DOI: 10.1016/j.saa.2015.02.102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 02/21/2015] [Accepted: 02/24/2015] [Indexed: 06/04/2023]
Abstract
Phase transitions of the centrosymmetric compound, [(C3H7)4N]2Zn2Cl6, were studied by differential scanning calorimetry (DSC), X-ray diffraction, Raman spectroscopy and dielectric measurements. Two reversible order-disorder and displacive phase transitions are observed at T1=327K and T2=347K with 3K and 4K hysteresis respectively, indicating a first order character. The evolution of Raman line shifts, "ν", and the half-width, "Δν", versus temperature show some singularities associated with the transitions, suggesting that they are governed by the reorientational and the displacement of the organic part. Besides the results of the dielectric permittivity study confirms the conclusion drawn from the calorimetric and Raman measurements that the phase transition located in the vicinity of the temperature of the dielectric proprieties is characterized by change of dynamical state of cation.
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P-252 – Dysmorphie faciale et surcharge en fer chez les enfants bêta-thalassémiques polytransfusés. Arch Pediatr 2015. [DOI: 10.1016/s0929-693x(15)30432-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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P-256 – Prise en charge du Purpura thrombopénique immunologique persistant ou chronique. Arch Pediatr 2015. [DOI: 10.1016/s0929-693x(15)30436-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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[Predictive factors of esophagojejunal fistula after total gastrectomy in gastric cancer patients]. LA TUNISIE MEDICALE 2013; 91:263-8. [PMID: 23673706 DOI: pmid/23673706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND The main complication observed after total gastrectomy is the oesophagojejunal anastomosic fistla. Its incidence varies between 7.4% and 11.5%. The mortality after anastomic leafage is high at around 20%, representing 30% and 54% of global mortality after total gastrectomy. AIM This study aimed to evaluate mortality and morbidity after total gastrectomy and to determine their predictive factor METHODS this is retrospective study about 80 cases of total gastrectomy for gastric cancer, collected in the departmentof General Surgery of the University Hospital Habib Thameur Tunis during the period 1 January 1995 to 31 December 2010. Reconstruction of the alimentary tract was achieved by Roux-en-Y-jejunal-loop. RESULTS Esophagojejunal anastomotic leeakage developed in 14 patients (17%). In 8 patients treatment of anastomotic leakage consisted of re-operation with surgical drainage and confection of jejunostomy. in one patient treatment required resutre of the anastomosis and drainage of an abscess. In one patient treatment required resuture of the anastomosis and drainage of an abscess. in 5 of the 14 patients with a proven leak of oesophagojejunal anastomosis, conservative treatment with parental alimentation, placement of an irrigation-aspiration system and systemic antibiotics was performed. This treatment was successful in all cases. The presence of anastomic fistula extends the median lenght of post operative stay in the hospital of 20 days compared for the payents withiut fistula.Global mortalilty was 8/80 (10%). After esophagojejunal anastomotic leakage, the mortality was 3/8 (21%). CONCLUSION Leakage of the oesophago-intestinal anastomosis may occur after total gastrectomy for gastric cancer. it's serious complication contributes to mortality after total gastrectomy. Knowledge of the predective factors of esophagojejunal fistula after total gastrectomy in gastric cancer can decrease its incidence .
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Prise en charge des complications de la diverticulose colique de 1998 à 2010 à l’hôpital Habib Thameur de Tunis. JOURNAL AFRICAIN D'HÉPATO-GASTROENTÉROLOGIE 2012. [DOI: 10.1007/s12157-012-0410-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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[Hydatid cyst of the muscles of the posterior abdominal wall: two cases]. LA TUNISIE MEDICALE 2010; 88:207-208. [PMID: 20415198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
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Crystal structure and spectroscopic studies of a new organic monohydrogenmonophosphate dihydrate. CRYSTAL RESEARCH AND TECHNOLOGY 2008. [DOI: 10.1002/crat.200710922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Crystal Structure and Spectroscopic Studies of a New Organic Dihydrogenmonophosphate [1-(2,3-(CH3)2-C6H3)C4H10N2]H2PO4. PHOSPHORUS SULFUR 2007. [DOI: 10.1080/10426500701370284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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34
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The Synthesis and Characterization of 2-Amino-3-methylpyridinium Dihydrogenmonophosphate: (C6H9N2)H2PO4. PHOSPHORUS SULFUR 2006. [DOI: 10.1080/10426500600614196] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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[Celiac disease revealed by hypocalcemia complicating total thyroidectomy: a case report]. ANNALES D'ENDOCRINOLOGIE 2006; 67:357-9. [PMID: 17072243 DOI: 10.1016/s0003-4266(06)72612-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
In order to illustrate a particular circumstance of diagnosis of celiac disease, we report the case of 54-year-old women with a history of thyroid enlargement with normal thyroid function and positive anti-peroxidase antibodies. Immediately after total thyroidectomy with preservation of the parathyroid glands, she developed tetany with total serum calcium level at 50mg/l. Intravenous calcium infusion increased the calcium level and led to resolution of hypocalcemia-induced signs but there was no result when calcium and vitamin D were taken orally. The diagnosis of malabsorption was very probable in light of the family history of celiac disease, the anemia and the hypoalbuminemia. The diagnosis was confirmed by antibodies assay and endoscopy. The PTH level was less than 1 pg/l and radiography showed signs of hyperparathyroidism. Gluten-free diet, calcium and vitamin D led to an improvement of serum calcium.
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Crystal structure of 5-chloro-2-methylanilinium chloride hydrate, (ClC7H6NH3)Cl · H2O. Z KRIST-NEW CRYST ST 2005. [DOI: 10.1524/ncrs.2005.220.14.105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Crystal structure of o-cyanoaniline hydrochloride,(NCC6H4NH3Cl. Z KRIST-NEW CRYST ST 2005. [DOI: 10.1524/ncrs.2005.220.14.385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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[Cardiac manifestations of sickle cell disease]. MEDECINE TROPICALE : REVUE DU CORPS DE SANTE COLONIAL 1992; 52:187-90. [PMID: 1406218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In this study the authors report the cardiac complications seen in the course of sickle-cell disease. Among 41 homozygot patients the complications reported were as follow. Effort dyspnea in 15/32 (46% cases); systolic souffle in 36 patients (87.8% of cases); cardiomegaly in 30 patients (17% of cases) and electric abnormalities in 70% of cases. The echotomography practised in 27 cases was normal in 12 cases and showed a hyperkinetic aspect in 10 cases, a cardiomyopathy in four cases.
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39
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[Duodeno-colonic fistulas of ulcerous origin]. LA TUNISIE MEDICALE 1991; 69:723-6. [PMID: 1808787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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40
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[A new case of relapsing hemolytic and uremic syndrome]. ANNALES DE PEDIATRIE 1991; 38:487-90. [PMID: 1952708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Relapsing hemolytic and uremic syndrome is infrequent in pediatric patients. The case of an infant who had HUS at 11 months of age and subsequently developed two relapses at 3 years and 3 1/2 years of age is reported. Outcome of the first episode was favorable, with no elements suggesting an increased risk for subsequent relapses. Conversely, the second and third episodes were followed by gradual deterioration of renal function and persistence of severe arterial hypertension. To clarify the epidemiology, clinical manifestations, histology, and outcome of HUS, the 24 pediatric cases of relapsing HUS reported in the English-language medical literature were reviewed. In this group, mean age at onset was 4 years 1 month (range 4 months-9 years) and number of relapses ranged from 1 to 14. Evidence of microangiopathy was the most common histologic finding (15/22) but non-specific lesions were seen in some instances. Opinions vary as to the prognosis of relapsing HUS; our case suggests that relapses are of adverse prognostic significance.
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41
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[Therapeutic aspects of traumatic perforations of the colon. 22 cases]. LA TUNISIE MEDICALE 1991; 69:381-4. [PMID: 1759304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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42
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[Current role of anterior sero-myotomy associated with posterior vagotomy (Taylor operation) in the treatment of chronic duodenal ulcer]. LA TUNISIE MEDICALE 1991; 69:363-8. [PMID: 1750148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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43
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[Total or subtotal colectomy in the treatment of left, obstructive colon cancers. 4 cases]. LA TUNISIE MEDICALE 1991; 69:147-51. [PMID: 1841468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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44
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[A new case of recurrent hemolytic and uremic syndrome]. LA TUNISIE MEDICALE 1991; 69:183-7. [PMID: 1841474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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45
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[Retroperitoneal tumors: 4 case reports]. LA TUNISIE MEDICALE 1990; 68:615-22. [PMID: 2288030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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46
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[Early infantile form of Niemann-Pick disease type C. Apropos of 2 siblings]. ANNALES DE PEDIATRIE 1989; 36:335-8. [PMID: 2742319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We report two cases of Niemann-Pick disease in a sister and brother. Early jaundice was the first manifestation in both cases and was followed by cachexia and a rapidly fatal outcome. Neurologic involvement was obvious in both patients. Biologic phenotype was consistent with a diagnosis of type C sphingomyelinase, although clinical expression was different. These two cases should be classified within the infantile and early forms of Niemann-Pick disease type C. Antenatal diagnosis was performed during a third pregnancy. Enzyme activity assays on a specimen of trophoblast taken at the tenth week of gestation showed the fetus was not affected. This diagnosis was confirmed by a normal clinical evaluation at two months of life, and normal sphingomyelinase activity of cultured skin fibroblasts.
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47
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[Treatment of perforated duodenal ulcer. Apropos of 74 cases]. LA TUNISIE MEDICALE 1989; 67:335-9. [PMID: 2799954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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48
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[Cystic dilatation of the choledochus (apropos of a case)]. LA TUNISIE MEDICALE 1989; 67:119-24. [PMID: 2669293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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49
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[Infantile gangliosidosis GM2 type B or Tay-Sachs disease]. LA TUNISIE MEDICALE 1988; 66:783-6. [PMID: 3070881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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50
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[Should acute diffuse appendicular peritonitis be drained?]. LA TUNISIE MEDICALE 1987; 65:511-4. [PMID: 3333118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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