Biomedical subjects

A Benhammou

Publications and source records attributed to A Benhammou.

11 recordsLinked to original sources

PubMed2006

[Bronchogenic cyst of the tongue].

OBJECTIVES: Bronchogemc cyst is a rare aberration secondary to abnormal detachment of accessory lung buds from the primitive foregut. Through one case of bronchogenic cyst of the tongue, the authors made a review of this exceptional localisation. MATERIAL AND METHODS: We report one case of bronchogenic cyst of the tongue treated in the Ibn Sina Hospital. RESULTS: Our patient was a new born admitted in our formation for a voluminous cystic mass ot the tongue, responsible of difficulty for mouth occlusion and feeding The radiology I confirms the liquid nature of this mass. The treatment was surgical, and the diagnosis of bronchogenic cyst was histological. CONCLUSION: Bronchogenic cysts are generally intrathoracic. The localization in the cervico-facial area is rare, and only 4 cases of bronchogenic cyst of the tongue were described in the literature. The clinical presentation is non specific, depending on the volume of the cyst. Radiology permits to confirm the nature of the mass. The certitude diagnosis is histological: bronchogenic cysts are lined by pseudostratified ciliated columnar epithelium with accessory tissues in the cyst wall, smooth muscle, seromucinous glands and cartilage, simulating a bronchus. Complete surgical excision is the base of the treatment.

Bronchogenic Cyst↗

PubMed2006

[Medial cleft of the tongue, the lower lip and the mandible].

INTRODUCTION: The oro-facial clefts are very frequent congenital malformations, with many clinical forms. We report an exceptional case of median cleft of the tongue, the lower lip and the mandible. CASE REPORT: Our patient was a new born, admitted in our unit for major facial malformation with swallowing disorder. The patient presented a particular form of cleft no 30 in Tessier's classification, which associated two hemi-tongues, two hemi-lower lips and two hemi-mandibles. Surgery was performed early because of the swallowing disorder. Cosmetic and functional results were positive, with 18 month follow-up. DISCUSSION: With a review of the literature, we describe this pathology, its embryologic origin, its different clinical forms and its treatment.

Deglutition Disorders↗

PubMed2006

[Giant form of infantile myofibromatosis located on the jaw].

INTRODUCTION: Infantile myofibromatosis is a rare fibrovascular-like tumour, characterized by the development of single or multiple nodular lesions arising from cutaneous, subcutaneous, muscular bone or visceral structures, diagnosed before 2 years. OBSERVATION: We report a case of infantile myofibromatosis located on the jaw, which is unique because of its large size (12 cm), its location and its neonatal presentation. It was a voluminous proliferate tumour with an ulcerated centre, located on the left jaw. Surgical excision was complete and the diagnosis was maded on histological examination. Recovery was uncomplicated with no recurrence on follow up. DISCUSSION: Diagnosis of infantile myofibromatosis is difficult because of the clinical heterogeneity and the histopathological appearance. The histological diagnosis relies on identification of two separate components, fascicular myofibroblastic at the periphery and hemangiopericytome in the centre. The most freqaent treatment is conservative surgical excision, because recurrence rates are low and there is a possibility of spontaneous regression. Some authors recommend conservative management of very large or multiple lesions particularly if excision will result in significant functional or cosmetic morbidity.

Female↗

PubMed2006

Ectopic lingual thyroid.

Ectopic lingual thyroid is an uncommon embryological aberration characterised by the presence of thyroid tissue located in a site other than the normal, pretracheal region. The tongue is the most frequent ectopic location of the thyroid gland; the clinical incidence of lingual thyroid varies between 1:3000 and 1:10,000. We present a new case of lingual thyroid in a 10-year-old child who presented dysphagia. The radiological findings and the biopsy confirmed the diagnosis. As the mass was well tolerated, surgery was not indicated. At this time, there are no signs of complications or malignant transformation.

Biopsy↗

PubMed2005

Adsorption of metal ions onto Moroccan stevensite: kinetic and isotherm studies.

The aim of this paper is to study the adsorption of the heavy metals (Cd(II), Cu(II), Mn(II), Pb(II), and Zn(II)) from aqueous solutions by a natural Moroccan stevensite called locally rhassoul. We carried out, first, a mineralogical and physicochemical characterization of stevensite. The surface area is 134 m2/g and the cation exchange capacity (CEC) is 76.5 meq/100 g. The chemical formula of stevensite is Si3.78Al0.22Mg2.92Fe0.09Na0.08K0.08O10(OH)2.4H2O. Adsorption tests of Cd(II), Cu(II), Mn(II), Pb(II), and Zn(II) in batch reactors were carried out at ambient temperature and at constant pH. Two simplified models including pseudo-first-order and pseudo-second- order were used to test the adsorption kinetics. The equilibrium time and adsorption rate of adsorption were determined. The increasing order of the adsorption rates follows the sequence Mn(II) > Pb(II) > Zn(II) > Cu(II) > Cd(II). The Dubinin-Radushkevich (D-R), Langmuir, and Redlich-Peterson (R-P) models were adopted to describe the adsorption isotherms. The maximal adsorption capacities at pH 4.0 determined from the D-R and Langmuir models vary in the following order: Cu(II) > Mn(II) > Cd(II) > Zn(II) > Pb(II). The equilibrium data fitted well with the three-parameter Redlich-Peterson model. The values of mean energy of adsorption show mainly an ion-exchange mechanism. Also, the influence of solution pH on the adsorption onto stevensite was studied in the pH range 1.5-7.0.

Journal Article↗

PubMed2005

Study of the removal of mercury(II) and chromium(VI) from aqueous solutions by Moroccan stevensite.

The objective of the present study was to investigate the adsorption of the heavy metals mercury(II) and chromium(VI), from aqueous solutions, onto Moroccan stevensite. A mineralogical and physicochemical characterization of natural stevensite was carried out. In order to improve the adsorption capacity of stevensite for Cr(VI), a preparation of stevensite was carried out. It consists in saturating the stevensite by ferrous iron Fe(II) and reducing the total Fe by Na(2)S(2)O(4). Then, the adsorption experiments were studied in batch reactors at 25+/-3 degrees C. The influence of the pH solution on the Cr(VI) and Hg(II) adsorption was studied in the pH range of 1.5-7.0. The optimum pH for the Cr(VI) adsorption is in the pH range of 2.0-5.0 while that of Hg(II) is at the pH values above 4.0. The adsorption kinetics were tested by a pseudo-second-order model. The adsorption rate of Hg(II) is 54.35 mmol kg(-1)min(-1) and that of Cr(VI) is 7.21 mmol kg(-1)min(-1). The adsorption equilibrium time for Hg(II) and Cr(VI) was reached within 2 and 12 h, respectively. The adsorption isotherms were described by the Dubinin-Radushkevich model. The maximal adsorption capacity for Cr(VI) increases from 13.7 (raw stevensite) to 48.86 mmol kg(-1) (modified stevensite) while that of Hg(II) decreases from 205.8 to 166.9 mmol kg(-1). The mechanism of Hg(II) and Cr(VI) adsorption was discussed.

Adsorption↗

PubMed2005

[Long term results of congenital middle ear cholesteatoma in children].

OBJECTIVES: To report the long term results of congenital cholesteatoma of the middle ear in children. PATIENTS AND METHODS: Retrospective study of thirty two children with 33 congenital cholesteatoma (1 bilateral cholesteatoma) operated on by the same surgeon. The mean age was 6 years. The most common clinical presentation was unilateral hearing loss. A trans-canal approach was performed in 4 cases and an intact canal wall technique in 29 cases. A two staged surgery was necessary in 28 patients, whom a residual cholesteatoma was observed in 7 patients. A third stage was performed in 11 patients because of a residual cholesteatoma in 2 two cases and a functional failure in 9 cases. RESULTS: At five years postoperative audiometry (air bone gap inferior or equal to 20 dB HL), a functional success was obtained in 50% of cases. CONCLUSION: The diagnosis of congenital cholesteatoma must be evoked in every atypical otitis media with effusion or unilateral transmission hypoacusis. The intact canal wall technique in two stages is the most appropriate treatment, since congenital cholesteatoma in children appears aggressive in a well pneumatized mastoid. The choice for an intact canal wall technique is also justified by the ambition of a conservative surgery in the young child. The functional results are generally satisfactory in early diagnosed cases. Thus, ENT and pediatric physicians have a unique role in detecting congenital cholesteatoma in the early period of life, and in ensuring a long term follow-up.

Adolescent↗

PubMed2005

Water resources management in soft drink industry-water use and wastewater generation.

Water is used in most process industries for a wide range of applications. Processes and systems using water today are being subjected to increasingly stringent environmental regulations on effluents and there is growing demand for fresh water. These changes have increased the need for better water management and wastewater minimisation. In Morocco, water use in the food and drink industry is extensive at approximately 24 million m3 per year including 14% of drinking water in 1994. This study was conducted in a carbonate soft drink industry plant, during two years, 2001 and 2002. We have investigated the state of consumption and use of fresh water and the generation of the effluent in the factory. The aim of the study is to identify potential opportunities for reducing fresh water intake and minimising wastewater production by studying the posibility of reuse, recycling and treatment.

Conservation of Natural Resources↗

PubMed2002

[Ear, nose and throat pathology in human immunodeficiency virus infection].

Human immunodeficiency virus (HIV) infection, which is responsible for AIDS, is one of the most widespread in the world. Its clinical manifestations are polymorphous, and are casued by the virus itself (primary lesions) or the resulting immunodepression (secondary lesions). All the body can be affected, and the ORL organs are frequently involved. Our purpose was to describe these manifestations at all stages of the disease, and to illustrate the importance of an early diagnosis, which needs close collaboration between the clinician, the anatomopathologist and the radiologist.

AIDS-Related Opportunistic Infections↗

PubMed2001

Hybrid modelling of anaerobic wastewater treatment processes.

This paper presents a hybrid approach for the modelling of an anaerobic digestion process. The hybrid model combines a feed-forward network, describing the bacterial kinetics, and the a priori knowledge based on the mass balances of the process components. We have considered an architecture which incorporates the neural network as a static model of unmeasured process parameters (kinetic growth rate) and an integrator for the dynamic representation of the process using a set of dynamic differential equations. The paper contains a description of the neural network component training procedure. The performance of this approach is illustrated with experimental data.

Bacteria, Anaerobic↗

PubMed2001

Hybrid neural modelling of an anaerobic digester with respect to biological constraints.

A hybrid model for an anaerobic digestion process is proposed. The fermentation is assumed to be performed in two steps, acidogenesis and methanogenesis, by two bacterial populations. The model is based on mass balance equations, and the bacterial growth rates are represented by neural networks. In order to guarantee the biological meaning of the hybrid model (positivity of the concentrations, boundedness, saturation or inhibition of the growth rates) outside the training data set, a method that imposes constraints in the neural network is proposed. The method is applied to experimental data from a fixed bed reactor.

Anaerobiosis↗