RESUMEN

The pomegranate butterfly Deudorix (= Virachola) livia is the major pest of pomegranate, a crop of economic importance, in Oman. A species of parasitoid wasp in the hymenopteran family Scelionidae is responsible for high levels of mortality of its eggs. This wasp is described herein as Telenomus nizwaensis Polaszek sp. n., based on morphology and DNA sequence data. T. nizwaensis is currently known only from D. livia, which is also a pest of economic importance on other crops in North Africa, the Arabian Peninsula, and the Mediterranean. We summarise current knowledge of T. nizwaensis life-history and its potential to provide biological pest control.

Asunto(s)

RESUMEN

A new species of bethylid parasitoid wasp, Goniozus omanensis Polaszek sp. n., is described based on morphology and DNA sequence data. The species is currently known only from the lesser date moth Batrachedra amydraula, a pest of economic importance, but can be reared on two factitious host species. G. omanensis is compared with G. swirskiana, known from the same host in Israel. We summarise current knowledge of G. omanensis life-history, and its potential as an agent of biological pest control.

Asunto(s)

RESUMEN

Cesarean sections are a common surgical procedure at risk of complications including adhesions and chronic pelvic pain. This case series presents 10 cases of patients presenting with chronic pelvic pain following a cesarean section which were found upon surgical exploration to have developed adhesions between the abdominal wall and the uterus. When they first consulted, patients were evaluated clinically with a questionnaire and physical exam, and with ultrasonography to evaluate pelvic anatomy when necessary. The evaluation was completed with diagnostic laparoscopy which revealed atypical post-cesarean adhesions which were treated by adhesion lysis or hysterectomy. Surgical protocols of the cesarean sections were retrieved and analysed for potential adhesion risk factors. Patients presented with chronic pelvic pain that appeared in the early post-operative period. Physical exam revealed a subinvoluted uterus with a high fixed cervix. Ultrasound examination revealed clues of adhesions manifested by points of traction and an irregular uterine border. No other diagnosis such as endometriosis, pelvic inflammatory disease, ovarian or bowel anomalies were identified during surgery. After laparoscopic adhesion lysis or hysterectomy, all patients who were treated noted a complete resolution of the pain that lasted during a follow-up of at least 5 years. These findings suggest that adhesions that create traction and fix the uterus to the abdominal wall following caesarian section can be the cause of severe chronic pelvic pain. In the presence of such pain, clinicians should suspect the presence of adhesions and investigate and treat patients accordingly.

Asunto(s)

RESUMEN

The parasitoid wasp Cephalonomia tarsalis (Ashmead) (Hymenoptera: Bethylidae) is commonly present in stored product facilities. While beneficial, it does not provide a high degree of biological pest control against its host, the saw-toothed beetle Oryzaephilus surinamensis (L.) (Coleoptera: Silvanidae). A candidate explanation for poor host population suppression is that adult females interfere with each other's foraging and reproductive behavior. We used simple laboratory microcosms to evaluate such mutual interference in terms of its overall effects on offspring production. We varied the density of the hosts and also the spatial structure of the environment, via the extent of population sub-division and the provision of different substrates. Production of C. tarsalis offspring was positively influenced by host density and by the isolation of females. With incomplete sub-division within microcosms offspring production was, in contrast, low and even zero. The provision of corrugated paper as a substrate enhanced offspring production and partially mitigated the effects of mutual interference. We recommend simple improvements to mass rearing practice and identify promising areas for further behavioral and chemical studies towards a better understanding of the mechanisms of mutual interference.

Asunto(s)

RESUMEN

The use of non-human primate models is required to understand the ageing process and evaluate new therapies against age-associated pathologies. The present article summarizes all the contributions of the grey mouse lemur Microcebus murinus, a small nocturnal prosimian primate, to the understanding of the mechanisms of ageing. Results from studies of both healthy and pathological ageing research on the grey mouse lemur demonstrated that this animal is a unique model to study age-dependent changes in endocrine systems, biological rhythms, thermoregulation, sensorial, cerebral and cognitive functions.

Asunto(s)

RESUMEN

OBJECTIVE: To assess the long-term effect of spinal cord stimulation (SCS) on angina symptoms and quality of life in patients with refractory angina pectoris defined as severe angina due to coronary artery disease resistant to conventional pharmacological therapy and/or revascularisation. METHODS: During 2003-2005, all patients with refractory angina referred for SCS treatment at 10 European centres were consecutively included in the European registry for refractory angina (European Angina Registry Link, EARL), a prospective, 3-year follow-up study. In the present study, the SCS-treated patients were followed-up regarding angina symptoms and quality of life assessed was with a generic (Short Form 36, SF-36) and a disease-specific (Seattle Angina Questionnaire, SAQ) quality of life questionnaire. RESULTS: In total, 235 patients were included in the study. After screening, 121 patients were implanted and followed up 12.1 months after implantation. The implanted patients reported fewer angina attacks (p<0.0001), reduced short-acting nitrate consumption (p<0.0001) and improved Canadian Cardiovascular Society class (p<0.0001). Furthermore, quality of life was significantly improved in all dimensions of the SF-36 and the SAQ. Seven (5.8%) of the implanted patients died within 1 year of follow up. CONCLUSIONS: SCS treatment is associated with symptom relief and improved quality of life in patients with refractory angina pectoris suffering from severe coronary artery disease.

Asunto(s)

RESUMEN

BACKGROUND: Patients with refractory angina have significant morbidity. This study aimed to compare two of the treatment options, Spinal Cord Stimulation (SCS) and Percutaneous Myocardial Laser Revascularisation (PMR) in terms of clinical outcomes and cost-effectiveness. METHODS: Eligible patients were randomised to PMR or SCS and followed up for exercise tolerance time (ETT), Canadian Cardiovascular Society (CCS) classification and the quality of life measures SF-36, Seattle Angina Questionnaire and the EuroQoL at 3, 12 and 24 months. Utilities were calculated using the EQ-5D and these and costs were compared between groups. The incremental cost-effectiveness ratio (ICER) per QALY for SCS compared to PMR was also calculated. RESULTS: At 24 months post-randomisation, patients that had SCS and PMR had similar ETT (mean difference 0.05, 95% CI -2.08, 2.18, p = 0.96) and there was no difference in CCS classification or quality of life outcomes. The difference in overall mean costs when comparing SCS to PMR was GBP5,520 (95% CI GBP1,966 to GBP8,613; p < 0.01) and the ICER of using SCS was GBP46,000 per QALY. CONCLUSION: Outcomes after SCS did not differ appreciably from those after PMR, with the former procedure being less cost-effective as currently applied. Larger studies could clarify which patients would most benefit from SCS, potentially increasing cost-effectiveness. TRIAL REGISTRATION: Current Controlled Trials ISRCTN09648950.

RESUMEN

The compression and compaction properties of plasticised high molecular weight USP2208 HPMC were investigated with the aim of improving tablet formation in HPMC matrices. Experiments were conducted on binary polymer-plasticiser mixtures containing 17 wt.% plasticiser, and on a model hydrophilic matrix formulation. A selection of common plasticisers, propylene glycol (PG) glycerol (GLY), dibutyl sebacate (DBS) and triacetin (TRI), were chosen to provide a range of plasticisation efficiencies. T(g) values of binary mixtures determined by Dynamic Mechanical Thermal Analysis (DMTA) were in rank order PG>GLY>DBS>TRI>unplasticised HPMC. Mean yield pressure, strain rate sensitivity (SRS) and plastic compaction energy were measured during the compression process, and matrix properties were monitored by tensile strength and axial expansion post-compression. Compression of HPMC:PG binary mixtures resulted in a marked reduction in mean yield pressure and a significant increase in SRS, suggesting a classical plasticisation of HPMC analogous to that produced by water. The effect of PG was also reflected in matrix properties. At compression pressures below 70 MPa, compacts had greater tensile strength than those from native polymer, and over the range 35 and 70 MPa, lower plastic compaction values showed that less energy was required to produce the compacts. Axial expansion was also reduced. Above 70 MPa tensile strength was limited to 3 MPa. These results suggest a useful improvement of HPMC compaction and matrix properties by PG plasticisation, with lowering of T(g) resulting in improved deformation and internal bonding. These effects were also detectable in the model formulation containing a minimal polymer content for an HPMC matrix. Other plasticisers were largely ineffective, matrix strength was poor and axial expansion high. The hydrophobic plasticisers (DBS, TRI) reduced yield pressure substantially, but were poor plasticisers and showed compaction mechanisms that could be attributed to phase separation. The effect of different plasticisers suggests that the deformation characteristics of this HPMC in the solid state is dominated by hydroxyl mediated bonding, rather than by hydrophobic interactions between methoxyl-rich regions.

Asunto(s)

RESUMEN

The bisbenzimidazole compound Hoechst 33342 (Ho342) has been identified as a specific Topoisomerase-I (Topo-I) inhibitor in mammalian cells. More recently, we have reported the ability of Ho342 to target L. donovani Topo-I, leading to parasite growth inhibition in vitro by mechanisms involving DNA breakage and apoptosis-like phenomenon. As the Ho342 lead molecule (2,5'-Bi-1H-benzimidazole) can be used as a starting structure for derivative compounds more effective against Leishmania, defining the Ho342 resistance mechanism(s) in Leishmania represents an important strategic tool. In the present study, we selected resistant parasites to Ho342 (LdRHo.300). While we observed an increase of the Topo-I gene expression correlated by a higher Topo-I DNA relaxation activity, the Topo-I genes (LdTOP1A and LdTOP1B) sequencing did not reveal any mutation for the resistant parasites. Moreover, our results on Ho342 cellular accumulation suggested the presence of a potential energy-dependent Ho342 transporter in the wild-type parasite, and that an alteration of this transporter has occurred in LdRHo.300, leading to an altered drug accumulation. Collectively, Ho342 resistance characterization provided results supporting that the resistance developed by LdRHo.300 involves complex mechanisms, most likely dominated by an altered drug accumulation, providing new insight in the Ho342 resistance mechanisms.

Asunto(s)

RESUMEN

In this study, we compared antigenic (hemagglutination inhibition (HI) assay) and molecular (sequencing of the hemagglutinin (HA1) gene) characterization of influenza isolates collected in the Province of Québec (Canada) during the last three flu seasons (1997-2000). Twenty-three isolates were tested by a standard HI assay and 37 by sequencing of the HA1 gene for their homology to the A/H3N2 vaccine strains A/Wuhan/359/95 (1997-1998) and A/Sydney/5/97 (1998-1999 and 1999-2000). By HI, two isolates were antigenically similar to A/Wuhan/359/95 (both from 1997 to 1998), 16 were similar to A/Sydney/5/97 (1997-2000) and no conclusions could be inferred for the other five isolates due to identical HI titers for the two vaccine strains (n=4) or insufficient viral titer (n=1). Sequence analysis revealed that four isolates from 1997 to 1998 were related to A/Wuhan/359/95 whereas the others (n=4) from 1997 to 1998, as well as all isolates from 1998 to 1999 (n=18) and 1999 to 2000 (n=11) were closer to A/Sydney/5/97. The mean number of amino acid differences for the 33 A/Sydney/5/97-like isolates compared with the homologous vaccine strain was 6.3 (1.9%), 9.2 (2.8%) and 13.6 (4.1%) for those collected in 1997-1998, 1998-1999, and 1999-2000, respectively. Phylogenetic analysis confirmed that a progressive drift occurred among our A/H3N2 influenza isolates over the last three flu seasons. Furthermore, it revealed that isolates collected during the last two flu seasons were in fact more related to A/Panama/2007/99 (2000-2001 vaccine strain) than to A/Sydney/5/97. Our studies suggest that molecular analysis of the HA1 gene should complement the HI assay for a more accurate analysis of influenza A virus drift.

Asunto(s)

RESUMEN

R. A. Fisher's sex ratio theory predicts that if sons and daughters cost fixed amounts of resources to raise and parents have fixed amounts to invest, then the numerical sex ratio of a panmictic population will evolve to be inversely proportional to relative cost. However, the theory assumes control by both parents. We show that allowing one parent to control the sex ratio biases it further from parity than Fisher's theory predicts. Quantitatively, the additional bias towards the cheaper sex depends only very weakly on which sex is in control. Qualitatively, however, the effect is very strong: a monomorphic, mixed-brood strategy evolves only if the more expensive sex is in control. If the controlling sex is cheaper to raise, then the sex ratio is instead achieved through a polymorphism of single-sex broods. Such polymorphisms are seldom observed in nature, generating the prediction that wherever the sexes are not equally costly, sex ratio is usually either under biparental control or under uniparental control by the more expensive sex. However, such polymorphisms do occur, and some of them may be explained by our model.

Asunto(s)

Asunto(s)

RESUMEN

The FLU OIA test was evaluated with 146 throat swab specimens from subjects with a flu-like illness in six Canadian clinics during the 1999-2000 flu season. The rate of positivity of the FLU OIA test (41.5%) was significantly lower than that of cell culture (55.2%) or reverse transcription-PCR (55.9%) during a season in which only influenza A virus was detected.

Asunto(s)

RESUMEN

Combined pharyngeal and nasal swab specimens were collected from 100 subjects who presented with a flu-like illness (fever >37.8 degrees C plus 2 of 4 symptoms: cough, myalgia, sore throat, and headache) of <72 hours' duration at 3 different clinics in the province of Quebec, Canada, during the 1998-1999 flu season. The rate of laboratory-confirmed influenza infection was 72% according to cell culture findings and 79% according to the results of multiplex reverse-transcription polymerase chain reaction (RT-PCR) analysis (85%, influenza AH3; 15%, influenza B). All subjects for whom these results were discordant (negative culture and positive PCR) presented with a temperature > or =38.2 degrees C as well as 3 or 4 of the symptoms in the clinical case definition. Stepwise logistic regression showed that cough (odds ratio [OR], 6.7; 95% confidence interval [CI], 1.4-34.1; P=.02) and fever (OR, 3.1; 95% CI, 1.4-8.0; P=.01) were the only factors significantly associated with a positive PCR test for influenza. The positive predictive value, negative predictive value, sensitivity, and the specificity of a case definition including fever (temperature of >38 degrees C) and cough for the diagnosis of influenza infection during this flu season were 86.8%, 39.3%, 77.6%, and 55.0%, respectively.

Asunto(s)

RESUMEN

The antiviral and clinical effects of inhaled zanamivir (10 mg twice daily for 5 days, started within the first or second day of a flulike illness) were evaluated in a randomized, placebo-controlled trial during the 1997-1998 influenza season in Canada. Pharyngeal secretions were collected with swabs every 12 h during 6 days, and symptoms were self-evaluated twice daily during 14 days. After only 12 h of treatment (1 dose), median virus titers decreased by 1.0 log10 TCID50/mL in the zanamivir group (n=17), compared with a 0. 42-log10 increase in the placebo group (n=10; P=.08). This was associated with a 4.5-day (47.4%) reduction in the median time to alleviation of all significant flu symptoms in the zanamivir recipients (P=.03 after adjusting for the initial virus titer and the time between onset of symptoms and treatment). Resistance to zanamivir was not detected in virus isolates by either phenotypic or genotypic assays.

Asunto(s)

RESUMEN

A case-control study in Ukraine provided the first data on the field effectiveness of Russian-produced vaccine during the 1990 diphtheria resurgence in the former Soviet Union. For each of 262 diphtheria cases <15 years of age who were reported from January through October 1992, 2 controls, matched by age and clinic, were selected. The effectiveness of three doses of diphtheria vaccine was 98.2% (95% confidence interval: 90.3-99.9). Among controls, 84% had received three or more vaccinations by 2 years of age. These results suggest that the following five hypothesized causes of the outbreak appeared unlikely: appearance of a new "mutant" diphtheria strain, low potency of the Russian-produced diphtheria vaccine, inadequate cold chain, poor host immunogenicity due to radiation exposure from Chernobyl, and low routine childhood vaccination coverage. It is concluded that initial priority for scarce resources for controlling this outbreak should be placed on vaccination of persons susceptible to diphtheria (e.g., adults) rather than revaccination of children.

Asunto(s)

RESUMEN

Prior to the completion of this and other studies, low effectiveness of diphtheria toxoid-containing vaccine was suspected to be a major contributing factor to the diphtheria epidemic that began in the Russian Federation in 1990. A vaccine effectiveness study was done in Moscow by enrolling physician-diagnosed cases and 10 control subjects per case. Controls were matched to cases by age (+/-3 months) and clinic registration. Vaccination history was abstracted from a standardized form for case-patients and from clinic vaccination records for control subjects. Two hundred seventeen case-patients and 2169 matched controls were included in the study. Most controls (92%) had received three or more doses of a diphtheria toxoid vaccine, compared with 72% of case-patients. The vaccine effectiveness for three or more doses was 97% (95% confidence interval: 94.3-98.4). Low vaccine effectiveness was not a contributing factor to the diphtheria epidemic in the Russian Federation. To control and prevent diphtheria epidemics, it is necessary to achieve and maintain high vaccination coverage with three or more doses of diphtheria toxoid among adults and children.

Asunto(s)