[Factors associated with Internet addiction among Tunisian adolescents]. / Facteurs associés à la cyberaddiction chez les adolescents Tunisiens.

INTRODUCTION: Internet addiction, a relatively new phenomenon, is a field of recent research in mental health, particularly within young populations. It seems to interact with several individual and environmental factors. OBJECTIVES: We aim to spot internet addiction in a Tunisian adolescent population, and to study its relationship with personal and family factors, as well as with anxious and depressive comorbidities. METHODS: We conducted a cross-sectional study of 253 adolescents recruited in public places in the city of Sfax in the south of Tunisia. We collected biographical and personal data as well as data describing family dynamics. The internet addiction was assessed by Young's questionnaire. Depressive and anxious co-morbidities were assessed using the HADS scale. The comparative study was based on the chi-square test and the Student's test, with a significance level of 5 %. RESULTS: The prevalence of internet addiction was 43.9 %. The average age of internet-addicts was 16.34 years, the male sex was the most represented (54.1 %) and increased the risk of internet addiction (OR a=2.805). The average duration of connection among Internet addicts was 4.6hours per day and was significantly related to internet addiction; P<0.001). Socializing activities were found in the majority of the internet-addicted adolescents (86.5 %). The type of online activity was significantly associated with internet addiction (P=0.03 and OR a=3.256). Other behavioral addictions were frequently reported: 35.13% for excessive use of video games and 43.25 % for pathological purchases. These two behaviors were significantly associated with internet addiction (with respectively P=0.001 and P=0.002 with OR=3.283). The internet-addicted adolescents lived with both parents in 91.9 % of cases. The mother's regular professional activity was significantly associated with internet addiction risk (P=0.04) as was the use of the Internet by parents and siblings (with respectively P=0.002 and P<0.001 with OR=3.256). The restrictive attitude of the parents was significantly associated with internet addiction risk (P<0.001 OR=2.57). Family dynamics, particularly at the level of adolescent-parent interactions, were a determining factor in internet addiction. Anxiety was more frequently found than depression among our cyber-dependent adolescents with frequencies of 65.8 % and 18.9 %, respectively. Anxiety was significantly correlated with the risk of internet addiction (P=0.003, OR a=2.15). There was no significant correlation between depression and the risk of internet addiction. CONCLUSION: The Tunisian adolescent seems at great risk of internet addiction. Targeted action on modifiable factors, especially those affecting family interactions, would be very useful in prevention.

[Alcohol use in adolescents and its association with sensation seeking and impulsivity: A survey in the city of Sfax, Tunisia]. / Enquête sur la consommation d'alcool et sa relation avec la recherche de sensations et l'impulsivité chez l'adolescent de la région de Sfax, Tunisie.

BACKGROUND: Although the increase of media interest for psychoactive substances use, especially alcohol, among young people, since the revolution, Tunisia has few epidemiological studies on this subject, which does not allow having a clear idea of the importance of the problem and its different determinants. AIMS: To assess the prevalence of alcohol consumption among adolescents in the region of Sfax (Tunisia) and to determine its relations to the two personality dimensions: sensation seeking and impulsivity. METHODS: This was a cross-sectional study involving 317 middle and high school students in Sfax (Tunisia). We used the Alcohol Use Disorders Identification Test (AUDIT) to assess risky alcohol-consumption, the Barratt Impulsiveness Scale (BIS-11) to assess the degree of impulsivity and the Sensation Seeking Scale (SSS-V) to assess the level of sensation seeking. RESULTS: The average age of students was 15.79±1.5 years with a sex-ratio of 1.07. The prevalence of experimenters (who had drunk alcohol at least once in their lifetime) was 19.6% while that of current consumers (who had drunk alcohol more than one time during the past 12 months before the survey) was 8.8%. Among those who reported alcohol use during the last year, 42.8% were alcohol-dependent, according to the AUDIT. The analysis of personality dimensions showed a significant association between current alcohol consumption and sensation seeking (P<0.001) in particular on the dimensions of disinhibition (DIS), experience seeking (ES) and boredom susceptibility (BS) (P respectively: <0.001; 0.002 and 0.001). Total impulsivity and motor and attention impulsivity were associated with current alcohol consumption (respective P: 0.001, 0.005 and 0.015). CONCLUSION: Our study of schooled Tunisian adolescents shows that sensation seeking and impulsivity are associated with the development of alcohol use. Such a behavior is worrisome because it appears to be quite frequent and often problematic.

Life-threatening subglottic hemangioma in an infant successfully treated with propranolol.

Subglottic hemangioma is a rare benign tumor in children. It causes an obstruction of the upper airway and can be life-threatening. Several therapeutic options have been used in the literature, including surgery. Currently, the treatment is essentially based on propranolol. We report the case of a 2-month-old female infant hospitalized for severe obstructive dyspnea secondary to a subglottic hemangioma. Diagnosis was confirmed by laryngoscopy and magnetic resonance imaging. The child underwent a tracheotomy and was treated with propranolol. The progression was favorable with regression of the subglottic hemangioma and improvement of laryngotracheal airway obstruction.

[A rare cause of recurrent meningitis in children: cochleovestibular dysplasia]. / Une cause rare de méningite récurrente chez l'enfant: la dysplasie cochléovestibulaire.

Recurrent bacterial meningitis is an uncommon disease of childhood. It occurs most often in children who have an underlying predisposing disorder that can result from anatomic fistula or immunodeficiency. Cochleovestibular dysplasia is a rare malformation of the inner ear that is often associated with translabyrinthine cerebrospinal fistula and then can cause recurrent bacterial meningitis. We report an unusual case of recurrent meningitis revealing cochleovestibular dysplasia in a 9-year-old child. The malformation was confirmed by imaging and the child had surgery. The outcome was favourable with no recurrence of meningitis during the 3 years after the operation.

[Sexuality of Tunisian women: Involvement of religion and culture]. / Sexualité de la femme tunisienne : entre le religieux et le culturel.

INTRODUCTION: Culture and religion carry several prohibitions and taboos, especially in the Arab-Muslim societies, and are therefore involved in the sexual behavior and its perception, particularly that of women. OBJECTIVES: To assess the married population's knowledge and opinion about female sexuality, and to estimate the impacts of religious and cultural factors on women's life experience and sexual practice in the Tunisian society. SUBJECTS AND METHODS: Our study is in an inquiry. We targeted 55 men and 55 women agreeing to participate in the study. They responded to an anonymous self-administered questionnaire comprising 18 items related to the influence of religion and culture on female sexuality. Among these items, some were binary responses (yes or no) assessing knowledge about female sexuality in the Tunisian religious and cultural context; 8 others explored the opinions of participants about female sexuality. Statistical analysis was performed using SPSS software (15th version). Pearson's chi-square test and Fisher's exact association test were used for comparative study (P<0.05). RESULTS: The rate of participants who did not manage to reach the threshold of 50% of responses compliant with religious precepts and morals in the Tunisian context was 48.19%. According to 61.8% of participants, the woman should consider sex as a religious duty, and according to 79.1%, she always ought to have sex with her husband even when she did not wish to. This assertion was more frequently reported by women (P<0.001). Among the participants, 35.5% did not approve of the idea that women had the right to reach sexual pleasure, like men. Men recognized this right less often than women did (P<0.001). With reference to social morals, 43.6% of participants thought that the woman should always remain passive when having sex. This opinion was more common to women (P<0.001). There were 71.8% who thought that premature ejaculation was not a limiting factor for female pleasure. Virginity was considered by 63.6% of respondents as a feminine virtue to preserve. This response was statistically more frequent among males (P<0.001). For 55.5%, in addition to sodomy, a man could not afford all the sexual practices with his wife. This response was significantly more frequent in males (P<0.001). Regarding the subjective perception of female sexuality, the percentage of those who thought that women might simulate orgasm was 70.9%. Women thought more frequently than men that such a behavior could be justified to avoid hurting the man's pride (P<0.001). CONCLUSION: The experience of sexuality within the Tunisian population is hampered by the prohibitions related to religion and culture, at least in some of its aspects. The reasons for that may be the ignorance of religious texts or their misinterpretation and the biased cultural transmission not followed by questioning or seeking deeper knowledge. The introduction of sex education in school programs could play a crucial role in the fight against the obstacles surrounding sexuality, in order to promote the welfare of woman, and thereby, that of the couple and the family.

[Psycho-emotional impact of a child's disability on parents]. / Répercussions psycho-affectives du handicap de l'enfant sur les parents.

Care for a child with a disability is a stressful experience for parents. It triggers a range of emotions and feelings that require a set of behaviors and attitudes to manage daily life. To face this situation, parents use coping strategies. The purpose of this study was to assess the psychological reactions (depression and anxiety) of parents and the impact of a child's disability on their quality of life (QOL), and to determine their coping strategies. A survey of 50 parents of handicapped children, treated in the neurology department at the Sfax Teaching Hospital in Tunisia, was conducted in September 2010. The Beck Depression Inventory (BDI), the State Trait Anxiety Inventory (STAI), the SF-36, and the Brief COPE were used to assess, respectively, depression, anxiety, QOL, and coping strategies in parents. Among the group of parents studied, the anxiety and depression rates were, respectively, 68% and 52%. Depression was more frequent among mothers and was correlated with low educational and socioeconomic levels. Anxiety was found in 70.7% of mothers and 55.6% of fathers with no significant correlation. There was a correlation between anxiety and increased family burden related to the presence of a similar case in the family. The range of coping strategies used includes religion (16%), active coping (16%), planning (16%), acceptance (20%), focus and venting of feelings (10%), and seeking emotional social support (10%). Parents used emotion-focused coping in 68% of cases and problem-centered coping in 32% of cases. The coping strategy choice was significantly correlated with gender. Mothers preferentially used emotion-focused coping. Depressed or anxious parents more frequently used emotion-focused strategies. Religious faith was correlated with a strategy centered on religious coping. The length of follow-up (more than 2years) was correlated with a strategy focused on acceptance. Emotion-focused coping was also correlated with low levels of education and socioeconomic status. We found correlations between depression and different types of emotion-focused coping such as emotional support. Impaired QOL was higher among mothers (58.5% versus 33.3%). It was correlated with depression, anxiety, and the use of emotional coping. Also, it was correlated with low educational and socioeconomic levels and increased family burden related to the presence of a similar case in the family. The size most commonly impaired in mothers was limited due to mental health (56.9% versus 44.4% for fathers). Social functioning (D6) was significantly correlated with the presence of a mental disability, the functional dependence of the child, and increased family burden related to the presence of a similar case in the family. Impaired QOL was found in 66.8% of parents dissatisfied with the explanations given by the medical team. More problem-focused coping was found in parents satisfied with the information given by the medical team compared to those inadequately informed (42.1% versus 25.8%). The presence of a disabled child causes profound changes in the family. The impact of anxiety and depression on parents and on their QOL are considerable. This is a situation that involves an adaptation process. At first, parents may be tempted to use coping strategies focused on religion, a choice related to Arab-Muslim fatalism. Parents should be encouraged to use active coping strategies to support their disabled child better. In addition, adequate information given by the healthcare staff would help them to deal with the child's handicap and would contribute to improving their QOL.

[Psychodynamic and forensic approach of constitutional mythomania: a case report]. / Approche psychodynamique et médicolégale de la mythomanie constitutionnelle: à propos d'une observation.

INTRODUCTION: Constitutional mythomania presents several diagnostic, aetiopathogenic and forensic problems for the doctor. We have discussed these aspects through the analysis of a case report. CASE REPORT: The case report relates to a 43 year-old man, who was subjected to a penal expertise following the emission of cheques without provision. During the examination, he pretended being both a doctor and a lawyer at the same time. He was in charge, among other things, of sale contracts dealing sometimes with high value transactions, obviously without following the required legal procedure. He was pursued subsequently for many other affairs of swindle. Data collected from his medical file indicated that he was the only boy of his family. Since his father had suffered from psychotic episodes, his grandfather had reared him; which he did it in a strictly religious way. He spent his childhood isolated. He was 15 years old when his grandfather died. He had then expressed religious and megalomaniac ideas that had motivated psychiatric management. Later on, he expressed imaginative ideas evoking unsystematized delusion (he pretended to have made a trip to America and to have seen a fish flying and turning into a woman). DISCUSSION: From a psychodynamic point of view, constitutional mythomania is considered as a borderline personality. It reflects an important narcissisic cleavage. The deceitfulness of the mythomaniac allows him to keep in touch with reality and to avoid mental disintegration. The recognition, by others, of these delusions allows the mythomaniac to have access to his proper level of existence. For a while, to the experts our patient appeared to be suffering from schizophrenia. Therefore, we can apply the Maleval theory to him, which identifies four periods as delusion structuring levels in psychosis : P0 (consequence of the phallic signification deficiency, it includes anxiety, annihilation, perplexity, interrogative attitude), P1 (stage of paranoid delusion), P2 (stage of paranoiac delusion) and P3 (ambitious stage evoking paraphrenia and squaring with mythomaniac behaviour). According to the Maleval theory, our patient would have experimented a repetitive cycle: he tried to escape instable and anxious positions (P0, P1) by committing sacrificial acting out (offence), or by reaching stable positions which are P2 and P3. The mythomaniac behaviour would appear during the latest period. The delusional decompensation would indicate a return to the first two periods. On the other hand, the personal myth might be seen as the result of the failure of the assimilation of actual experiences. Several psychoanalysts consider the use of myths by some psychotics as an attempt to reduce their ego disintegration. The mythomaniac may create his own myth in order to reduce the psychotic anxiety. The personal myth does not represent the pain of the patient but his remedy against his disorders. Therefore, identifying a personal myth may help the psychotic to turn his delusion into supportable logic of life. Myth may also be used in less deep pathologies such as borderline context, where it dominates the clinical picture. CONCLUSION: On the forensic level, we could a priori postulate that the mythomaniac sufficiently perceives reality to be considered as lucid. In fact, he hardly masters the totality of his intentions, being guided by an irrepressible mechanism that makes mythomania a "serious" and handicapping illness; its prima victim being the patient him/herself. No measures could actually prevent the latter from infringing the law, except, perhaps, a permanent administrative control; but this would not be without practical and ethical problems.

[Evaluation of the knowledge concerning women's sexuality in Tunisia]. / Évaluation des connaissances relatives à la sexualité de la femme en Tunisie.

OBJECTIVES: Our objectives were to evaluate the theoretical knowledge about women's sexuality in a Tunisian population and to compare it according to the participant's gender. PATIENTS AND METHODS: Our study consisted in investigating 55 men and as many women. Those surveyed had answered an anonymous autoquestionnaire comprising items related to woman's body anatomy, foreplay, women's attitudes during sexual intercourse, female orgasm and contraception. RESULTS: Fifty percent of the participants did not manage to reach the level of 50% of proper answers. Men had answered more incorrectly than had women (P<0.001). They had more erroneous answers than women concerning the importance of the knowledge of female anatomy and of the foreplay for the sexual satisfaction in women (P<0.001). Eighty percent thought that the simultaneity of the orgasm was obligatory for the sexual satisfaction of the couple. DISCUSSION AND CONCLUSION: Men had more erroneous answers than women, concerning the importance of the knowledge of the female anatomy, by both partners, for the sexual satisfaction of the woman. A good knowledge of the women body and of the importance of foreplays allows one to be conscious of the erotegenic zones and of knowing all the resources, which lead to physical pleasure. Awareness's campaigns contribute to fight against deficiencies surrounding women's sexuality, which would favor the opening out of the woman and the family.

[Quality of life in patients with schizophrenia: a study of 100 cases]. / Qualité de vie des malades atteints de schizophrénie : étude de 100 cas.

OBJECTIVE: The aim of the present study was to evaluate the quality of life (QOL) in outpatients with schizophrenia, and to identify factors correlated to an impaired QOL among them. SUBJECTS AND METHODS: A transversal study, in the form of an inquiry, was conducted in 100 outpatients, during seven months, in the psychiatric department of the Hedi Chaker teaching hospital in Sfax - Tunisia. We used the "36 item Short-Form Health Survey" (SF-36) to assess the QOL; this has been considered as impaired when the global medium score was inferior to 66.7. For the global assessment of functioning and the global assessment of the interference by existing side effects with the patient's daily performance, we have used respectively the Global Assessment of Functioning scale (GAF) and the Udvalg of Kliniske Undersogelser (UKU) side effect rating scale. The positive and negative symptoms added to the general psychopathology were assessed using the Positive and Negative syndrome scale (PANSS). RESULTS: The QOL was impaired in 34% of the cases. The analysis of the scores of the eight dimensions by the scale SF-36 has shown that the most affected dimensions were, in decreasing order: mental health (MH), general health perceptions (GH), vitality (VT), role limitations due to physical health problems (RP) and role limitations due to emotional problems (RE). The standardization revealed that six dimensions were impaired; these were, in decreasing order: mental health (MH), social functioning (SF), role limitations due to emotional problems (RE), role limitations due to physical health problems (RP), general health perceptions (GH) and physical functioning (PF). The standardization has also revealed an impairment of the psychological component, while the physical component has been conserved. After analysis by multiple linear regression, four factors appeared strongly correlated with the impaired QOL: the professional inactivity, the episodic course with interepisode residual symptoms, the presence of side effects moderately influencing the daily performance, and a general psychopathology score for 26 at least. These four factors affected, in decreasing order of importance, social functioning (SF) (related to two factors), general health perceptions (GH) and role limitations due to emotional problems (RE) (each related to one factor). None of the factors appeared to affect the other dimensions: physical functioning (PF), role limitations due to the physical health problems (RP), bodily pain (BP), mental health (MH) and vitality (VT). The bivariate analysis revealed three other factors correlated, to a lesser degree, to the impairment of the QOL: the disorganized sub-type, a score of (GAF) inferior or equal to 30 and the negative type of schizophrenia. CONCLUSION: Management of schizophrenic patients should go beyond the remission of the symptoms; it has also to target the improvement in QOL. This needs an action over the factors that affect the QOL, among which residual symptoms and side effects. The atypical antipsychotics would contribute preciously in this way, due to their efficacy on negative symptoms and their better tolerance than the conventional ones.

[Reticence towards electroconvulsive therapy: a study of 120 caregivers in a teaching hospital in Tunisia]. / De la réticence face à l'électroconvulsivothérapie : enquête auprès de 120 personnels soignants dans un centre hospitalo-universitaire en Tunisie.

INTRODUCTION: Electroconvulsive therapy (ECT) is rarely practiced in Tunisia. We have tried to explain this lack of use by studying theoretical knowledge, the perception and the attitudes of health professionals towards ECT. METHODS: We conducted a survey in the region of Sfax in Tunisia. It included 120 participants. The latter were divided into four groups, composed of 30 members, in order to compare them: group 1 (psychiatrists); group 2 (neurologists and anaesthetists); group 3 (psychiatric nurses); group 4 (paramedics in the neurological and anaesthesia wards). The surveyed people answered an auto-questionnaire including essentially 16 items: 11 had binary answers (true or false) related to theoretical knowledge about ECT, and five others explored the perception and attitudes concerning this therapy. RESULTS: Concerning the items exploring theoretical knowledge, 67.5% of people were not able to answer, in conformity with the consensual scientific data, a minimum of 75% questions. The rates were significantly lower among the paramedics (P<0.001) and those who work outside the psychiatric wards (P=0.003). The answers of psychiatric caregivers were less frequently incorrect compared to those of non psychiatric ward workers. The latter more frequently thought that the psychiatrists easily resorted to ECT (P=0.003). The paramedics perceived, more frequently than doctors, the ECT as a violent therapeutic means (P=0.001), and more frequently refused to give their consent to apply ECT to a relative (P=0.044). The rate of doctors who refused to give their consent to apply ECT to a relative was statistically higher in group 2 than in group 1 (P=0.017). Doctors with higher scores in theoretical knowledge, consent more frequently to apply ECT to a member of their families (P=0.001). DISCUSSION: The comparison of theoretical knowledge between the two groups of doctors (group 1 versus group 2) revealed significantly more frequent incorrect answers among non-psychiatrists. The latter more frequently had erroneous ideas: that ECT was performed without anaesthesia; that it wasn't possible to apply it to pregnant women, nor to people suffering from Parkinson's disease, nor as a preventive treatment of recurrence, and that the vital risk was higher with ECT than medical treatments. Compared to the caregivers of group 3, group 4 had significantly more frequent negative attitudes toward ECT; concerning the application without anaesthesia, the lack of tolerance and the over-mortality rate related to ECT. This therapy seems to create an apprehension and a reticence among health professionals, mainly the paramedics and the non-psychiatrists. The lack of valid scientific knowledge concerning ECT allows prejudiced ideas to tarnish the image of this therapy. CONCLUSION: Information and training would play a primordial role in the improvement of the perception and attitudes concerning ECT, and lower the reticence towards this therapy, which in spite of its proven efficacy, always maintains a pejorative image.

[Cultural aspects in depression masked by psychotic symptoms in Maghreb countries: three case reports]. / Aspects culturels dans la dépression masquée par des symptômes psychotiques.

CASE REPORTS: In this study, we will describe three observations of depression "masked" by persecution delirium and/or hallucinations, to illustrate the role that the cultural factor could play in the expression and care of depression. In the first two observations, the persecutor was a group that was apparently difficult to circumscribe: the persecution appeared more important than the persecutor. In these two cases, persecution also had a depreciating role for the patient. In the third observation, the hallucinatory manifestations cast a slur on self-esteem and caused narcissistic injury. DISCUSSION: Analysis of the cultural context allows us to understand the depressive significance of such psychotic symptoms. In the traditional societies, depression is strongly related to the cultural context, it is often expressed by the fear of being punished or denied by the group, and a feeling of treason towards the community. The punishment can be direct or indirect, carried out by imaginary beings, "the djinn", or by any disease. According to Freud, the guilt is expressed by the fear of the vengeance of a dead man's spirit, which is then going to persecute the culprit. This persecution, which has a value of punishment, is based on the mechanism of the projection. In the same sense, Freud explained that the death, as a sequel of the disease, is the vengeance of the dead man's spirit in the living. In all religions, the impulses, the thoughts disapproved by the community, are attributed to Satan who etymologically means "the enemy" or "the opponent". This latter plays an important role in relieving fears, the sense of guilt and the disapproved thoughts. There is also involvement of the projection mechanism. So, guilt could be expressed by delirious ideas such as the conviction of being the victim of a demonic possession, to be under a spell or to be persecuted. CONCLUSION: Thus, taking the cultural context into account would allow us to fundamentally understand the depressive meaning of the delirious symptomatology of persecution, which is taken from a popular theory of misfortune shared and validated by the familial and the social circle of acquaintances. Plantine postulates that the psychotic conflict takes the subject away from the standards of his own culture. In the case of our three patients, we should try to establish a form of communication, to prevent them from falling into alienation. Thus, we must think about our attitude facing a patient who is diagnosed as depressed or even psychotic, while the patient believes he/she is possessed by a "Djinn". The therapeutic attitude should be adapted to the cultural dimension of the case. Thus, in situations similar to the studied cases, the therapy should be essentially based on the development of a psychotherapeutic relationship, rather than a pharmacotherapy, one should be careful not to compromise the cultural means of restoring psychic disorders such as the traditional therapy.

[Pulmonary function in children after neonatal meconium aspiration syndrome]. / Fonction respiratoire des enfants ayant des antécédents d'inhalation méconiale.

BACKGROUND: Meconium aspiration syndrome is a disease of the newborn mature or post mature. The acute pulmonary consequences can be extremely severe. In the few studies of the long-term pulmonary sequelae, it seems that certain children surviving meconium aspiration syndrome keep an obstructive syndrome. The aim of our study was to assess long term respiratory residual damage from meconium aspiration syndrome. METHODS: During a seven-year period going from 1994 to 2000, we reviewed the files of children hospitalized in neonatology department of Sfax for meconium aspiration syndrome. The children who were convoked (group M: n=27), underwent spirometry, followed by an exercise stress. An age matched control group (group C: n=23) of healthy children was investigated in the same way. RESULTS: The group M comprised 15 boys and 12 girls aged four to 11, an average of 7+/-1.9 years. With the study of the respiratory function, we did not find an obstructive syndrome. Spirometry revealed a total pulmonary capacity in an average of 133+/-55.65% of theoretical (group M) versus 105.5+/-27.96% of theoretical (group C) (P<0,01), testifying to alveolar hyperinflation. Spirometry fulfilled 5, 10 and 15 min after exercise showed a FEV1 reduction of respectively 8.5 versus 2 (P<0.05); 9.5 versus 3 (P<0.01) and 10.5 versus 4 (P<0.05). CONCLUSION: Children surviving meconium aspiration syndrome tend to develop alveolar hyperinflation and airway hyperreactivity to exercise.

Effect of the chitin binding domain deletion from Bacillus thuringiensis subsp. kurstaki chitinase Chi255 on its stability in Escherichia coli.

Bacillus thuringiensis subsp. kurstaki BUPM255 secretes a chitobiosidase Chi255 having an expected molecular weight of 70.665 kDa. When the corresponding gene, chi255, was expressed in E. coli, the active form, extracted from the periplasmic fraction of E. coli/pBADchi255, was of about 54 kDa, which suggested that Chi255 was excessively degraded by the action of E. coli proteases. Therefore, in vitro progressive C-terminal Chi255 deleted derivatives were constructed in order to study their stability and their activity in E. coli. Interestingly, when the chitin binding domain (CBD) was deleted from Chi255, an active form (Chi2555Delta5) of expected size of about 60 kDa was extracted from the E. coli periplasmic fraction, without the observation of any proteolytic degradation. Compared to Chi255, Chi255Delta5 exhibited a higher chitinase activity on colloidal chitin. Both of the enzymes exhibit activities at broad pH and temperature ranges with maximal enzyme activities at pH 5 and pH 6 and at temperatures 50 degrees C and 40 degrees C, respectively for Chi255 and Chi255Delta5. Thus, it was concluded that the C-terminal deletion of Chi255 CBD might be a nice tool for avoiding the excessive chitinase degradation, observed in the native chitinase, and for improving its activity.

The isokinetic assessment of peripheral muscle function in patients with coronary artery disease: correlations with cardiorespiratory capacity.

OBJECTIVE: We aimed to determine whether diminished cardiorespiratory capacity in patients with coronary artery disease (CAD) is accompanied by impaired skeletal muscle function as measured by isokinetic dynamometry. We also evaluated the correlation between isokinetic strength and aerobic capacity in these patients. MATERIALS AND METHODS: Fifteen CAD patients and 15 age-matched healthy subjects (mean age 60+/-6 vs. 57+/-3.5 years) underwent maximal laboratory exercise testing, a 6-min walking test and an assessment of peripheral skeletal muscle function by use of an isokinetic apparatus. Quadricep and hamstring function was tested at two angular velocities, 150 and 180 degrees s(-1) with simultaneous electrocardiography monitoring. The cardiorespiratory and mechanical parameters (VO(2), ventilatory threshold [VT], heart rate [HR], and power) were measured at VT and at maximal effort. RESULTS: Quadricep and hamstring peak torque was impaired in CAD patients, with quadriceps peak torque at 180 degrees being 71.13 +/- 14 vs. 91.13 +/- 23 Nm (P<0.01) and hamstring peak torque 46.50+/-10 vs. 59.86+/-12 Nm (P<0.01). CAD subjects presented a deficient aerobic capacity as compared with the healthy subjects at maximal effort. At VT, the VO(2), ventilation, and HR were significantly lower in CAD patients, at 13.77+/-2.33 vs. 17.08+/-3.59 ml min(-1) kg(-1) (P<0.05), 29.64 +/- 664 vs. 37.76 +/- 7.2 ml min(-1) (P<0.05), and 86+/-14 vs. 111+/-15 beats min(-1) (P=0.001), respectively. The 6-min walking distance was significantly shorter for CAD patients than healthy subjects (425.93+/-52.77 vs. 551.46 +/- 57.94 m; P<0.01). In CAD patients quadriceps and hamstring strength was not correlated with VO(2) at maximal effort and at VT. Total distance walked during the 6-min walk and VO(2)max were correlated (r=0.869; P<0.001) but not at VT. CONCLUSION: CAD patients showed impaired cardiorespiratory capacity accompanied by increased muscle fatigability as compared with healthy subjects. An isokinetic muscle assessment in these patients must be achieved systematically and seems to have value in cardiovascular rehabilitation.

Molecular characterization of a novel chitinase from Bacillus thuringiensis subsp. kurstaki.

AIMS: The present work aims to study a new chitinase from Bacillus thuringiensis subsp. kurstaki. METHODS AND RESULTS: BUPM255 is a chitinase-producing strain of B. thuringiensis, characterized by its high chitinolytic and antifungal activities. The cloning and sequencing of the corresponding gene named chi255 showed an open reading frame of 2031 bp, encoding a 676 amino acid residue protein. Both nucleotide and amino acid sequences similarity analyses revealed that the chi255 is a new chitinase gene, presenting several differences from the published chi genes of B. thuringiensis. The identification of chitin hydrolysis products resulting from the activity, exhibited by Chi255 through heterologous expression in Escherichia coli revealed that this enzyme is a chitobiosidase. CONCLUSIONS: Another chitinase named Chi255 belonging to chitobiosidase class was evidenced in B. thuringiensis subsp. kurstaki and was shown to present several differences in its amino acid sequence with those of published ones. The functionality of Chi255 was proved by the heterologous expression of chi255 in E. coli. SIGNIFICANCE AND IMPACT OF THE STUDY: The addition of the sequence of chi255 to the few sequenced B. thuringiensis chi genes might contribute to a better investigation of the chitinase 'structure-function' relation.

Polysaccharide storage myopathy--case report and literature review.

Polysaccharide myopathy is a rare form of storage muscular disorder. The clinical picture of this particular form of myopathy is unspecific. We report a 62-year-old woman with late-onset progressive weakness and wasting, affecting proximal muscles of the four limbs and the girdles. No myalgia, dysphagia nor symptoms of cardiac failure were observed. Muscle biopsy revealed a vacuolar myopathy with accumulation of amylopectin-like polysaccharide. This material was strongly PAS-positive and diastase-resistant. At electron microscopy, the deposits were composed of non-membrane-bound filamentous and granular material surrounded by numerous mitochondria. No enzyme deficiency was found. Clinical presentation of our patient was similar to the 16 cases reported in the literature. She did not have myocardiopathy and her survival is much longer. Hypothetic mechanisms of polysaccharide accumulation are reviewed.

Improvement of bioinsecticides production through adaptation of Bacillus thuringiensis cells to heat treatment and NaCl addition.

AIMS: The present work aimed to increase yields of delta-endotoxin production through adaptation of Bacillus thuringiensis cells to heat shock and sodium chloride and to investigate their involvements in bioinsecticides production improvement. METHODS AND RESULTS: Growing B. thuringiensis cells were heat treated after different incubation times to study the response of the adaptative surviving cells in terms of delta-endotoxin synthesis. Similarly, adaptation of B. thuringiensis cells to sodium chloride was investigated. Adaptation to combined stressors was also evaluated. When applied separately in the glucose-based medium, 20-min heat treatment of 6-h-old cultures and addition of 7 g l(-1) NaCl at the beginning of the incubation gave respectively 38 and 27% delta-endotoxin production improvements. Heat shock improved toxin synthesis yields, while NaCl addition improved delta-endotoxin production by increasing the spore titres without significant effect on toxin synthesis yields. Cumulative improvements (66%) were obtained by combination of the two stressors at the conditions previously established for each one. Interestingly, when the similar approach was conducted by using the large scale production medium based on gruel and fish meal, 17, 8 and 29% delta-endotoxin production improvements were respectively, obtained with heat shock, NaCl and combined stressors. CONCLUSIONS: Heat treatment of vegetative B. thuringiensis cells and NaCl addition to the culture media improved bioinsecticides production. Heat treatment increased toxin synthesis yields, while addition of NaCl increased biomass production yields. Cumulative improvements of 66 and 29% were obtained in glucose and economic production media, respectively. SIGNIFICANCE AND IMPACT OF THE STUDY: Overproduction of bioinsecticides by B. thuringiensis could be obtained by the combination of heat treatment of vegetative cells and addition of NaCl to the culture medium. This should contribute to a significant reduction of the cost of B. thuringiensis bioinsecticides production and utilization, and also manage for higher toxin content in the bioinsecticides, which is very interesting from a practical point of view because fewer spores would be disseminated into the ecosystem.

[Hepatitis A infection and Henoch-Schonlein purpura: a rare association]. / Hépatite A et purpura rhumatoïde: une association rare.

OBSERVATION: A 10-year-old boy presented cholestatic hepatitis A virus infection confirmed by IGM anti-HAV antibody. Three days after admission, he presented a palpable purpuric rash on the declivous regions, arthralgia and abdominal pain. He met all criteria set by the American College of Rheumatology (ACR) for Henoch Schonlein purpura. The evolution was gradually favorable with no renal involvement (recoil of 3 years and half). CONCLUSION: Henoch Schonlein purpura is an exceptional extra-hepatic manifestation of hepatitis A infection.