Qualitative evaluation of an edutainment intervention to prevent age-disparate transactional sex in Tanzania: Changes in educational aspirations and gender equitable attitudes towards work

Age-disparate transactional sex is a major contributor to the disproportionate rates of HIV experienced by adolescent girls in sub-Saharan Africa, and a key driver of unintended adolescent pregnancy. This paper comprises one element of the impact evaluation of the Learning Initiative on Norms, Exploitation and Abuse (LINEA) radio drama intervention to prevent age-disparate transactional sex. It provides new insights into the radio drama's influence on distal drivers of age-disparate transactional sex identified in formative research: girls' own educational aspirations, and gendered attitudes towards work. The intervention, which targeted adolescent girls and their caregivers in the Shinyanga Region of Tanzania, uses an edutainment approach to prevent transactional sex between girls aged 12-16 years and men at least 5-10 years older. We distributed the 39-episode radio drama on USB flash drives to 331 households and conducted longitudinal in-depth interviews with 59 participants. We conducted a thematic analysis of endline (December 2021) transcripts from 23 girls, 18 women caregivers, and 18 men caregivers of girls (n = 59), and midline (November 2021) transcripts from a sub-sample of these participants: 16 girls, 16 women and 13 men (n = 45). Findings suggest the radio drama created an enabling environment for preventing age-disparate transactional sex by increasing girls' motivation to focus on their studies and remain in school. There was also strong evidence of increased gender-equitable attitudes about work among girls and women and men caregivers. These supported women joining the workforce in positions traditionally reserved for men and challenging the male provider role. Our findings suggest that the LINEA radio drama can supplement interventions that address structural drivers of age-disparate transactional sex. The radio drama may also have impacts beyond preventing age-disparate transactional sex, such as reducing girls' HIV morbidity and mortality, and challenging attitudes that promote sexual and gender-based violence to foster more gender-equitable communities across Tanzania.

Global phylogenomic assessment of Leptoseris and Agaricia reveals substantial undescribed diversity at mesophotic depths

BACKGROUND

Mesophotic coral communities are increasingly gaining attention for the unique biological diversity they host, exemplified by the numerous mesophotic fish species that continue to be discovered. In contrast, many of the photosynthetic scleractinian corals observed at mesophotic depths are assumed to be depth-generalists, with very few species characterised as mesophotic-specialists. This presumed lack of a specialised community remains largely untested, as phylogenetic studies on corals have rarely included mesophotic samples and have long suffered from resolution issues associated with traditional sequence markers.

RESULTS

Here, we used reduced-representation genome sequencing to conduct a phylogenomic assessment of the two dominant mesophotic genera of plating corals in the Indo-Pacific and Western Atlantic, respectively, Leptoseris and Agaricia. While these genome-wide phylogenies broadly corroborated the morphological taxonomy, they also exposed deep divergences within the two genera and undescribed diversity across the current taxonomic species. Five of the eight focal species consisted of at least two sympatric and genetically distinct lineages, which were consistently detected across different methods.

CONCLUSIONS

The repeated observation of genetically divergent lineages associated with mesophotic depths highlights that there may be many more mesophotic-specialist coral species than currently acknowledged and that an urgent assessment of this largely unstudied biological diversity is warranted.

Cash plus programming and intimate partner violence: a qualitative evaluation of the benefits of group-based platforms for delivering activities in support of the Ethiopian government's Productive Safety Net Programme (PSNP)

OBJECTIVES

Intimate partner violence (IPV) is a public health challenge but there is evidence that cash and cash 'plus' interventions reduce IPV. An increasingly popular design feature of these kind of interventions is the group-based modality for delivering plus activities, however, evidence of the mechanisms through which this modality of delivery impacts IPV is limited. We explore how the group-based modality of delivering plus activities that complemented the Government of Ethiopia's Productive Safety Net Programme contributed to modifying intermediate outcomes on the pathway to IPV.

DESIGN

Qualitative study using in-depth interviews and focus group discussions between February and March 2020. Data were analysed using a thematic content and gender lens approach. Findings were interpreted, refined and drafted in collaboration with our local research partners.

SETTING

Amhara and Oromia regions in Ethiopia.

PARTICIPANTS

In total 115 men and women beneficiaries from the Strengthen PSNP4 Institutions and Resilience (SPIR) programme took part in the study. Fifty-eight were interviewed and 57 took part in 7 focus group discussions.

RESULTS

We found that Village Economic and Social Associations-through which SPIR activities were delivered-improved financial security and increased economic resilience against income shocks. The group-based delivery of plus activities to couples appeared to enhance individual agency, collective power and social networks, which in turn strengthened social support, gender relations and joint decision-making. Critical reflective dialogues provided a reference group to support the shift away from social norms that condone IPV. Finally, there appeared to be gender differences, with men highlighting the financial benefits and enhanced social status afforded by the groups, whereas women's accounts focused primarily on strengthened social networks and social capital.

CONCLUSION

Our study offers important insights into the mechanisms by which the group-based delivery of plus activities affects intermediate outcomes on the pathway to IPV. It underscores the importance of the modality of delivery in such programmes, and suggests that policy-makers should consider gender-specific needs as men and women might differentially benefit from interventions that enhance social capital to generate gender transformative impacts.

Incidence, complications and costs of peripheral venous catheter-related bacteraemia: A retrospective, single centre study

The aim of the present study was to estimate the current incidence, complications and costs of BSI attributable to PVC. Patients with PVC-related BSI (cases) were matched with patients without PVC-related BSI (controls). From January 1st, 2018 to March 31th, 2020 9,833 out of 113,068 patients visiting the emergency department (9%) were hospitalised in a medical ward after insertion of a PVC. Among them, 581 (6%) had at least one positive blood culture (BC). Twenty-five (4%) of these were judged as having a PVC-related BSI. Major complications were noted in nine patients. One patient presented severe sepsis requiring admission to intensive care unit for eleven days followed by thoracic (T4 to T7) spondylodiscitis requiring prolonged antimicrobial therapy. Another patient developed mitral valve endocarditis also requiring prolonged antimicrobial therapy. One patient developed a pre-sacral abscess three months after initial PVC infection and required hospital readmission for 19 days for drainage. Median [IQR] hospital stay costs were €11,597 [€8,479-€23,759] for cases and €6,789 [€4,019-€10,764] for controls, leading to median additional costs of €5,587. In conclusion, even though the risk of developing PVC-related BSI in patients admitted to medical wards may seem low, complications of PVC-related BSI are severe, and the associated mortality remains high. The financial resources used to treat these complications could be better spent on prevention, including the use of high-quality materials and technologies, and improved training of health care providers.

The role of gender and romantic jealousy in intimate partner violence against women, a mixed-methods study in Northern Ecuador

Male romantic jealousy is a commonly cited driver of intimate partner violence against women. An in-depth, contextualised understanding of the pathways and mechanisms from jealousy to intimate partner violence is, however, needed to inform programmes and interventions. We triangulated data from 48 interviews, eight focus groups and 1216 survey findings from low-income married women and men in northern Ecuador. Male jealousy was associated with controlling behaviours (aOR: 14.47, 95% CI: 9.47, 22.12) and sexual intimate partner violence (aOR: 2.4, 95% CI: 1.12, 5.12). Controlling behaviours were associated with physical and sexual intimate partner violence (aOR: 2.16, 95% CI: 1.21, 3.84). Qualitatively we found that most respondents framed jealousy within a discourse of love, and three triggers of male jealousy leading to intimate partner violence were identified: (1) community gossip, which acted as a mechanism of community control over women's movements and sexuality; (2) women joining the labour force, which was quantitatively associated with intimate partner violence and partially mediated by jealousy; and (3) women's refusal to have sex, which could lead husbands to coerce sex through accusations of infidelity. Gender-transformative interventions at the individual, couple and community level providing models of alternative masculinities and femininities may offer promise in reducing intimate partner violence in Ecuador. Importantly, future economic empowerment interventions should address jealousy to mitigate potential intimate partner violence backlash.

A mixed-methods, exploratory, quasi-experimental evaluation of a radio drama intervention to prevent age-disparate transactional sex in Tanzania

INTRODUCTION

Age-disparate transactional sex (ADTS) is associated with HIV, unintended pregnancy, school dropout and violence, yet few interventions have successfully prevented it, and none have set ADTS prevention as their primary outcome. This exploratory evaluation aimed to assess indications of change after exposure to the Learning Initiative on Norms, Exploitation and Abuse (LINEA) intervention, a mass-media, gender-transformative social norms intervention aimed at preventing ADTS in Tanzania.

METHODS

In a condensed implementation 331 participants were instructed to listen to the LINEA radio drama over seven weeks, and 60 were randomly allocated to household discussion sessions about content. In-depth interviews (n = 81) from girls aged 12-16 years, and women and men caregivers were collected at baseline (September 2021), midline (November) and endline (December 2021). Surveys were conducted (n = 120) at baseline and endline using the Norms and Attitudes on ADTS Scale (NAATSS) and the Gender Roles and Male Provision Expectations (GRMPE) scale. Interviews were thematically analyzed using a framework approach. Age-stratified linear regression models adjusted for baseline scores were used to measure association between the intervention and endline scale scores.

RESULTS

Longitudinal data were available from 59 qualitative (73%) and 95 quantitative participants (79%). Qualitative evidence revealed the drama facilitated family conversations about adolescent challenges, allowing caregivers to advise daughters. Some girls gained confidence to refuse men's gifts, learning that accepting them could necessitate sexual reciprocation. Some caregivers felt increased responsibility for supporting girls in the community to avoid ADTS. Blame for ADTS shifted for some from girls to men, suggesting increased understanding of inequitable power dynamics and reductions in victim blaming. Marginal quantitative evidence revealed that highly exposed girls had improved gender equitable beliefs on the GRMPE (β = -6.26; 95% CI: -12.94, 0.42). Moderately exposed men had increased gender inequitable norms on the NAATSS subscale (β = 0.42 95% CI: 0.05, 0.79), but there was no effect in highly exposed men.

CONCLUSIONS

Given the small sample results should be interpreted cautiously. Our initial findings indicate high engagement with the LINEA intervention shows promise in shifting knowledge, behaviors, and attitudes, beliefs and social norms driving ADTS in Shinyanga, Tanzania, supporting a robust impact evaluation.

A qualitative study exploring parent-daughter approaches for communicating about sex and transactional sex in Central Uganda: Implications for comprehensive sexuality education interventions

INTRODUCTION

Ugandan adolescent girls and young women are disproportionately impacted by human immunodeficiency virus, and this is largely driven by their engagement in transactional sex. Globally, parent-daughter communication about sex is associated with increased contraceptive use and delayed/decreased sexual activity, but research on parent-daughter communication about transactional sex is lacking. This paper elucidates local perspectives on, and experiences of parent-daughter communication about sex and transactional sex, to inform family-level comprehensive sexuality education interventions.

METHODS

We conducted a secondary, thematic analysis of 13 focus group discussions (n = 119) and 30 in-depth interviews collected between 2014 and 2015 with adolescent girls and young women aged 14+, and men and women in Kampala and Masaka.

RESULTS

We found that parents used three approaches to discuss sex and transactional sex with their daughters: (1) frightening their daughters into avoiding sex; (2) being "strict"; and (3) relying on mothers rather than fathers to "counsel" daughters. Mother-daughter communication about transactional sex was common, but frequently unidirectional. Adolescent girls and young women bringing home gifts sparked conversations about the risks of transactional sex, although less in poorer households. Mothers felt they lacked control over their daughters' sexual behaviors and thus restricted their movements and friendships to try to prevent them from having sex. In contrast to previous research, we found some evidence of mothers encouraging condom use and father-daughter communication about sex.

CONCLUSIONS

Family-level comprehensive sexuality education interventions targeting parent-daughter communication about sex could further highlight the role that fathers might play, and emphasize communication about the inequitable power dynamics in transactional sex and condom negotiation skills, while reducing fear surrounding parent-daughter communication.

Systematic review of social norms, attitudes, and factual beliefs linked to the sexual exploitation of children and adolescents

BACKGROUND

Despite growing interest in the role of social norms in perpetuating the harmful practice of sexual exploitation of children and adolescents (SECA), little is known about the state of the literature on this issue.

OBJECTIVE

This systematic review aims to summarize what associated norms, attitudes and factual beliefs have been identified by the SECA literature worldwide.

METHODS

Multiple database searches were conducted using controlled vocabulary and keywords referring to SECA.

RESULTS

Our searches identified 3690 unique references. After applying our exclusion criteria, 49 studies, including over 14,000 participants from 37 countries and most world regions, were included. Across studies we identified six injunctive norms perpetuating SECA: owning goods as a social status marker ; being sexually active; exchanging sex for favors; contributing financially to the household; stigma and discrimination against young people who experienced SECA; and lack of social sanctions for SECA perpetrators. These norms were supported by enhanced tolerance of SECA when it involved older or more physically developed adolescents and when it occurred in poverty-affected contexts. Beliefs around markers that denote adolescents' readiness for sex; men's entitlement to sex; and the perceived benefits of intergenerational relationships, also contributed to the maintenance and reproduction of SECA. Findings from all regions suggested that marginalized young people are particularly vulnerable to SECA.

CONCLUSIONS

Interventions to reduce SECA must consider individual, social, and structural factors and how they interrelate. Context-specific social norms interventions are needed to address harmful norms, promote protective norms, and improve services for those who have experienced SECA.

A computed tomography study of the fibula: morphology, morphometry, intramedullary anatomy, application prospects on intramedullary nailing

PURPOSE

The intramedullary percutaneous pinning in fractures of the lateral malleolus is a technique of osteosynthesis that can reduce complications of ORIF. Our study describes the morphology and the morphometry of the fibula, in particular intramedullary, so as to specify the best fibular nail features.

METHODS

We conducted a retrospective study on CT acquisitions of fibulae in vivo. We studied total length, and the distal malleolar angle. Regarding intramedullary morphology, six axial study levels were defined. Each level was assigned a morphometric classification (oval, triangular, quadrangular or irregular), and a measure of the diameter of the cavity. The distance between the smaller diameter and the malleolar tip was investigated.

RESULTS

We included 50 patients for 97 fibulae. The average age was 66.5 years. The irregular morphology type was the most frequently found. The average length was 370.5 mm (SD = 18.1; CI 95% [366.9; 374.1]), the average distal malleolar angle was 163.5° (SD = 3.7; CI 95% [162.7; 164.2]). The average minimal intramedullary diameter at malleolus level was 3.2 mm (SD = 1.2; CI 95% [3.0; 3.5]), with a minimum size reaching 95.8 mm (SD = 13.8; CI 95% [93.0; 98.5]) of the malleolar tip.

CONCLUSIONS

The analysis of morphological parameters of the fibula, in particular the lateral malleolus and intramedullary morphology is necessary for the design of a morpho-adapted nail. Interpersonal variability must be taken into account by the implant industry to offer nails of suited lengths and diameters.

[Deep venous thrombosis caused by congenital inferior vena cava agenesis]

Congenital agenesis of the inferior vena cava, although rare, is found preferentially in young patients with proximal deep venous thrombosis. Exact diagnosis can be made thanks to enhanced computed tomography scan and/or magnetic resonance imaging, while Doppler ultrasonography is insufficient to establish an inferior vena cava malformation. A consensus has not yet been established for the treatment but lifelong anticoagulation with elastic stocking support to prevent post-thrombotic syndrome is commonly considered in most cases. We report a case of an unprovoked deep venous thrombosis caused by a congenital agenesis of the inferior vena cava localized to the infrarenal segment, in a 24-year-old man. An anticoagulation with low molecular weight heparin was started and prolonged oral anticoagulation was prescribed. In the absence of the usual thrombotic risk factors, the presence of an inferior vena cava anomaly should be considered.

Quality control implementation for universal characterization of DNA and RNA viruses in clinical respiratory samples using single metagenomic next-generation sequencing workflow

Background

In recent years, metagenomic Next-Generation Sequencing (mNGS) has increasingly been used for an accurate assumption-free virological diagnosis. However, the systematic workflow evaluation on clinical respiratory samples and implementation of quality controls (QCs) is still lacking.

Methods

A total of 3 QCs were implemented and processed through the whole mNGS workflow: a no-template-control to evaluate contamination issues during the process; an internal and an external QC to check the integrity of the reagents, equipment, the presence of inhibitors, and to allow the validation of results for each sample. The workflow was then evaluated on 37 clinical respiratory samples from patients with acute respiratory infections previously tested for a broad panel of viruses using semi-quantitative real-time PCR assays (28 positive samples including 6 multiple viral infections; 9 negative samples). Selected specimens included nasopharyngeal swabs (n = 20), aspirates (n = 10), or sputums (n = 7).

Results

The optimal spiking level of the internal QC was first determined in order to be sufficiently detected without overconsumption of sequencing reads. According to QC validation criteria, mNGS results were validated for 34/37 selected samples. For valid samples, viral genotypes were accurately determined for 36/36 viruses detected with PCR (viral genome coverage ranged from 0.6 to 100%, median = 67.7%). This mNGS workflow allowed the detection of DNA and RNA viruses up to a semi-quantitative PCR Ct value of 36. The six multiple viral infections involving 2 to 4 viruses were also fully characterized. A strong correlation between results of mNGS and real-time PCR was obtained for each type of viral genome (R² ranged from 0.72 for linear single-stranded (ss) RNA viruses to 0.98 for linear ssDNA viruses).

Conclusions

Although the potential of mNGS technology is very promising, further evaluation studies are urgently needed for its routine clinical use within a reasonable timeframe. The approach described herein is crucial to bring standardization and to ensure the quality of the generated sequences in clinical setting. We provide an easy-to-use single protocol successfully evaluated for the characterization of a broad and representative panel of DNA and RNA respiratory viruses in various types of clinical samples.

Electronic supplementary material

The online version of this article (10.1186/s12879-018-3446-5) contains supplementary material, which is available to authorized users.

[External cephalic version in case of persisting breech presentation at term: motivations and women's experience of the intervention]

OBJECTIVES

To evaluate the efficacy and acceptability of external cephalic version (ECV).

MATERIALS AND METHOD

From 2004 to 2008, 212 pregnant women between 34-37 weeks of gestation with fetus in breech presentation were included in a randomized clinical trial and 125 externals cephalic versions were studied.

RESULTS

A success rate of 37.6%t was recorded. At 34 weeks of gestation, 80.6% of women were considering an ECV in the event of persistent breech position at 37 weeks. These women expressed the desire to give birth vaginally (52% versus 24.4%, P<0.001). In contrast, others women preferred an elective cesarean section to avoid the risk of a breech vaginal delivery. Women felt pain during the ECV and scored 60 on average using the analogical visual scale. Women rated on a verbal rating scale the ECV as severely painful to unbearable (68%), and as stressful (70%). Despite this, the majority of women would recommend ECV to their friends or would be willing to repeat it for themselves.

DISCUSSION AND CONCLUSION

ECV remains a scary and painful medical procedure. More research is needed to reduce the impact. The use of analgesic medication for this indication is controversial. Hypnosis could be an alternative to evaluate.

[Auditory and vestibular findings in Fabry disease: a study of 25 patients]

PURPOSE

Fabry disease (FD, OMIM 301500) is an X-linked lysosomal storage disorder due to deficient activity of the enzyme alpha-galactosidase A. Males and females exhibit severe organ involvement. The high incidence of otological symptoms was recently reported.

PATIENTS AND METHODS

Monocentric and retrospective study of twenty-five patients with FD (13 families; seven males and 18 females). The patients underwent audiological assessment before initiation and during enzyme replacement therapy. We also analysed neurologic heart and kidney status.

RESULTS

Twenty patients (80%; 13 females and seven males) complained of otologic symptoms. Audiological evaluation showed a sensorineural hearing loss in 17 patients, bilateral in 16 out of them. Vestibular examination showed a functional impairment in two patients (one female, one male). Correlations were found between hearing loss and either kidney disease (73,3%), neurological complications (100%) and cardiomyopathy (80%). Fourteen patients (56%; seven females, seven males) received enzyme replacement therapy. Improvement or stabilization of the audiological evaluation was reported in seven patients, whereas worsening was observed in three patients.

CONCLUSION

This study confirms the high frequency of audiological involvements in females and males with FD. Our analysis suggests that the frequency of hearing loss is increased in the presence of renal or neurologic involvement or cardiomyopathy. There is no clinically significant efficacy of enzyme replacement therapy on hearing function. Although the pathophysiology remains unknown, a vascular mechanism responsible of the inner ear involvement seems to be privileged.

[Aquadynia: a role for VIP?]

BACKGROUND

Aquadynia (water-related cutaneous pain) is a very rare disorder, recently described.

CASE REPORT

A 40 year-old woman suffered from aquagenic pruritus, complicated by paresthesia and pain. There was no clinical argument in favor of a psychiatric disorder, Fabry's disease or any other disease. Clinical and histological cutaneous examinations were normal. Immunohistochemical study of neurotransmitters (substance P, calcitonin gene-related peptide or CGRP, vasoactive intestinal peptide or VIP, somatostatine) did not show any modification in nerve density. However, VIP-immunoreactive epidermal cells were observed. Electromyography and study of somesthesic-evoked potentials were normal. No treatment had provided any efficacy. Clonidine and capsaicin had been prescribed with partial success.

DISCUSSION

Three other cases of aquadynia have been reported. Differential diagnoses of aquadynia are aquagenic pruritus and urticaria, hysteria or simulation, Fabry's disease, erythermalgia, peripheral neuropathy or polycythemia vera. The presence of VIP-immunoreactive cells suggests that VIP could be produced by these cells after contact with water. The effects of propanolol and clonidine on aquadynia are in favor of an adrenal component.

Medicago truncatula ENOD11: a novel RPRP-encoding early nodulin gene expressed during mycorrhization in arbuscule-containing cells

Leguminous plants establish endosymbiotic associations with both rhizobia (nitrogen fixation) and arbuscular mycorrhizal fungi (phosphate uptake). These associations involve controlled entry of the soil microsymbiont into the root and the coordinated differentiation of the respective partners to generate the appropriate exchange interfaces. As part of a study to evaluate analogies at the molecular level between these two plant-microbe interactions, we focused on genes from Medicago truncatula encoding putative cell wall repetitive proline-rich proteins (RPRPs) expressed during the early stages of root nodulation. Here we report that a novel RPRP-encoding gene, MtENOD11, is transcribed during preinfection and infection stages of nodulation in root and nodule tissues. By means of reverse transcription-polymerase chain reaction and a promoter-reporter gene strategy, we demonstrate that this gene is also expressed during root colonization by endomycorrhizal fungi in inner cortical cells containing recently formed arbuscules. In contrast, no activation of MtENOD11 is observed during root colonization by a nonsymbiotic, biotrophic Rhizoctonia fungal species. Analysis of transgenic Medicago spp. plants expressing pMtENOD11-gusA also revealed that this gene is transcribed in a variety of nonsymbiotic specialized cell types in the root, shoot, and developing seed, either sharing high secretion/metabolite exchange activity or subject to regulated modifications in cell shape. The potential role of early nodulins with atypical RPRP structures such as ENOD11 and ENOD12 in symbiotic and nonsymbiotic cellular contexts is discussed.

Cloning and characterization of two maize cDNAs encoding cinnamoyl-CoA reductase (CCR) and differential expression of the corresponding genes

Cinnamoyl-CoA Reductase (CCR, EC 1.2.1.44) catalyses the first step of the lignin pathway. Two full-length cDNAs identified by sequence analysis as CCR-encoding cDNAs were isolated from a maize root cDNA library. These two cDNAs designated ZmCCR1 and ZmCCR2 exhibit 73% sequence conservation at the nucleotide level for their coding regions and are relatively divergent at their 5'- and 3'-untranslated regions. They both contain a common signature which is thought to be involved in the catalytic site of CCR. Northern blot analysis indicated that ZmCCR2 was expressed at very low levels in roots whereas ZmCCR1 was widely expressed in different organs. The high level of ZmCCR1 gene expression along the stalk suggests that the corresponding enzyme is probably involved in constitutive lignification.

Rhizobium meliloti Nod factors elicit cell-specific transcription of the ENOD12 gene in transgenic alfalfa

Extracellular lipo-oligosaccharides of Rhizobium, known as Nod factors, play a key role in the molecular signal exchange which leads to the specific nitrogen-fixing symbiotic association between the soil microbe and its host legume. The biological activity of Nod factors and their perception by the host plant during the earliest stages of the Rhizobium/legume interaction have been studied using transgenic alfalfa carrying a fusion between the promoter of the early nodulin gene MtENOD12 and the beta-glucuronidase (GUS) reporter gene. Histochemical staining has shown that GUS accumulates specifically in the differentiating root epidermis, prior to and during root hair emergence, within 2-3 h following the addition of purified Rhizobium meliloti Nod factors. This precocious transcriptional activation of the MtENOD12 gene, reminiscent of that observed after inoculation with intact Rhizobium, implies that the Nod factor signal can be perceived at a developmental stage preceding root hair formation. GUS activity can be detected following treatment with a wide range of R. meliloti Nod factor concentrations down to 10(-13) M, and furthermore, this rapid response to the bacterial elicitor appears to be non-systemic. Significantly, MtENOD12-GUS expression is not observed after inoculation with a R. meliloti nodH mutant which synthesizes exclusively non-sulphated Nod factors. Indeed purified Nod factors which lack the sulphate substituent are approximately 1000-fold less active than their sulphated counterparts. Thus, the triggering of ENOD12 transcription in the alfalfa root epidermis is a rapid molecular response which is subject to the same host-specificity determinant (Nod factor sulphation) that governs the interaction between alfalfa and its bacterial symbiont.

[SCL 90 R in a sample of French-speaking subjects free of psychiatric disorders]

With a sample of 1,331 subjects we form three groups, considering the subjective somatic and psychic state of mind. The first group with a good state may represent the normal subjects N = 780. We else compare here the different groups.

Rhizobium meliloti elicits transient expression of the early nodulin gene ENOD12 in the differentiating root epidermis of transgenic alfalfa

To study the molecular responses of the host legume during early stages of the symbiotic interaction with Rhizobium, we have cloned and characterized the infection-related early nodulin gene MtENOD12 from Medicago truncatula. In situ hybridization experiments have shown that, within the indeterminate Medicago nodule, transcription of the MtENOD12 gene begins in cell layers of meristematic origin that lie ahead of the infection zone, suggesting that these cells are undergoing preparation for bacterial infection. Histochemical analysis of transgenic alfalfa plants that express an MtENOD12 promoter-beta-glucuronidase gene fusion has confirmed this result and further revealed that MtENOD12 gene transcription occurs as early as 3 to 6 hr following inoculation with R. meliloti in a zone of differentiating root epidermal cells which lies close to the growing root tip. It is likely that this transient, nodulation (nod) gene-dependent activation of the ENOD12 gene also corresponds to the preparation of the plant for bacterial infection. We anticipate that this extremely precocious response to Rhizobium will provide a valuable molecular marker for studying early signal exchange between the two symbiotic organisms.

Effects of ascorbic acid and pyridoxine supplementation on oxalate metabolism in peritoneal dialysis patients

We studied the effect of vitamin C and B6 supplementation on oxalate metabolism in seven patients receiving chronic peritoneal dialysis therapy. The study was divided into three phases, each lasting 4 weeks. Plasma oxalate, total ascorbic acid, and pyridoxal-5'-phosphate (PLP) were measured at the end of each phase. Twenty-four-hour urinary excretion and dialysate removal rates of oxalate were also obtained. At the end of phase I (supplement-free period), plasma oxalate levels were markedly elevated at 47.6 +/- 7.1 mumol/L (437 +/- 66 micrograms/dL) (normal, 3.4 +/- 0.4 mumol/L [30.3 +/- 1.6 micrograms/dL]). Plasma total ascorbic acid levels were 62 +/- 6 mumol/L (1.0 +/- 0.1 mg/dL) (normal, 45 to 57 mumol/L [0.8 to 1.0 mg/dL]), while plasma PLP levels were markedly reduced to 24 +/- 5 nmol/L (normal, 40 to 80 nmol/L). Daily supplements of 0.57 mmol (100 mg) ascorbic acid orally (phase II) resulted in a 19% increase in the plasma oxalate levels to 57.8 +/- 6.1 mumol/L (520 +/- 55 micrograms/dL) (P less than 0.03), with a concomitant 60% increase in the plasma ascorbate levels (91 +/- 6 mumol/L [1.6 +/- 0.1 mg/dL], P less than 0.01). Plasma PLP values remained low. Finally, during phase III (0.57 mmol or 100 mg ascorbic acid plus 59.6 mumol or 10 mg pyridoxine HCI orally daily), plasma oxalate levels declined by 17% to 47.9 +/- 5.2 mumol/L (431 +/- 47 micrograms/dL) (P greater than 0.05 v phase II).(ABSTRACT TRUNCATED AT 250 WORDS)

Ascorbic acid supplements in patients receiving chronic peritoneal dialysis

Ascorbic acid supplements are commonly prescribed to patients with end-stage renal disease receiving peritoneal dialysis. To establish the need for ascorbic acid supplements, we evaluated seven chronic peritoneal dialysis patients during a supplement-free (phase I) period, and while receiving oral ascorbic acid (0.57 mmol/d [100 mg/d]) (phase II). Because of a proposed interaction with vitamin B6, patients were additionally supplemented with pyridoxine HCl (59.6 mumol/d [10 mg/d]) (phase III). Plasma levels and dialysate removal rates of total ascorbic acid and plasma pyridoxal-5-phosphate (PLP) were measured at the end of each phase. During phase I, plasma ascorbic acid levels (normal, 45 to 57 mumol/L [0.8 to 1.0 mg/dL]) declined slightly from 74 +/- 11 mumol/L (1.3 +/- 0.2 mg/dL) to 62 +/- 11 mumol/L (1.1 +/- 0.2 mg/dL) (P less than 0.02) at the end of the third week, and then remained stable to the end of the fourth week. Plasma ascorbic acid levels were no different in patients with or without residual renal function. With the addition of vitamin C supplements, plasma ascorbic acid levels increased by 45% of the baseline value at the end of phases II (P less than 0.001). The dialysate removal rate of ascorbic acid was 0.28 +/- 0.03 mmol/d (50 +/- 6 mg/d) at the end of phase I, and increased by 57% of the baseline value at the end of phases II (P less than 0.001). However, the peritoneal clearance of ascorbic acid remained unchanged during all phases the study. Pyridoxine depletion or repletion had no effect on plasma ascorbic acid levels (P greater than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)

Vitamin B6 requirements of patients on chronic peritoneal dialysis

Patients with chronic renal failure often develop vitamin B6 deficiency, which is of clinical concern because the multiorgan system manifestations are similar to those of uremia. Vitamin B6 deficiency in hemodialysis patients has been previously studied, but the need for daily pyridoxine supplementation in patients on chronic peritoneal dialysis (CPD) remains unclear. Therefore, we studied a group of 11 stable patients, nine on CAPD and two CCPD, to test for vitamin B6 deficiency and to establish daily requirements. Adequacy of vitamin B6 nutrition was assessed by measurement of plasma and dialysate effluent total vitamin B6 and pyridoxal 5'-phosphate (PLP), the latter using a very sensitive modification of the tyrosine apodecarboxylase enzyme assay. After four weeks without vitamin B6 supplements on a diet containing 1.3 +/- 0.2 mg vitamin B6/day (7.7 +/- 1.2 mumol/day), all patients had subnormal plasma PLP levels, 16 +/- 3 nmol/liter (nml 40 to 60), seven having a severe deficiency (less than or equal to 20 nmol/liter). Plasma total vitamin B6 levels (which includes non-PLP forms of the vitamin) were normal in all patients at baseline, 116 +/- 29 nmol/liter. Peritoneal losses were small, 8 +/- 2 nmol PLP/day and 545 +/- 61 nmol total vitamin B6/day. Supplementation with 5 mg/day oral pyrodoxine HCl for up to 16 weeks adequately repleted eight patients (65 +/- 7 nmol PLP/L), while three patients required 10 mg/day to achieve normal plasma PLP levels. During three episodes of peritonitis, dialysate losses of PLP did not increase.(ABSTRACT TRUNCATED AT 250 WORDS)