Up-Scalable Synthesis of Size-Controlled White-Green Emitting Behavior of Core/Shell (CdSe/ZnS) Quantum Dots for LED Applications.

Research on CdSe/ZnS core-shell quantum dots (QDs) was synthesized by a chemical route using bio-conjugated organic amino acid (L-Cysteine). The structural, morphological, and optical properties of the nanocrystal powder samples were analyzed using various characterization techniques. The diameter of the resulting QDs was about 3 nm with uniform size distribution. The optical properties QDs exhibited an absorption and emission peak at 515 and 525 nm respectively, at room temperature. The QDs through emission in the spectral range at 516-535 nm is special for their application in green LEDs and white-light generation. The high optical properties performance of the QDs nanocomposites gained indicates that the materials are promising for (LED) applications.

Ambiguous bodies, uncertain diseases: knowledge of cervical cancer in Papua New Guinea.

OBJECTIVES: Within their local realities, people experience and interpret disease in diverse ways that do not necessarily correlate or converge with Western biomedical interventions. In the high cervical cancer burden setting of Papua New Guinea, understanding how people experience and interpret cervical cancer is necessary for effective intervention. Drawing on work by Street on the production of unstable biomedical knowledge, we explored how ambiguity and uncertainty, coupled with cultural taboos and linguistic limitations, affect what and how people 'know' about women's reproductive organs and their associated disease. DESIGN: A qualitative research approach was used to explore and understand how people in PNG articulate matters of health and disease as they relate to cervical cancer and HPV infection. Specifically, how unstable biomedical knowledge is produced and sustained. We employed a mixed-methods approach in collecting data from 208 (147 women) participants between 2011 and 2012 across 3 provinces in PNG. RESULTS: We found that knowledge and awareness about cervical cancer were poor. Five thematic areas emerged in our analysis, which included the gendered knowledge of women's reproductive health, the burden of cervical cancer in the community and the role (or limitation) of language. We further identified four ways in which ambiguity and uncertainty operate on both sociocultural and biological levels, and in the intersection between to produce unstable biomedical knowledge. These included poor knowledge of where the cervix is located and the uncertainty or unreliability of (lay) diagnoses of disease. CONCLUSION: Local understandings of cervical cancer reflected the limitations of Tok Pisin as a lingua franca as well as the wider uncertain biomedical environment where diagnoses are assembled and shared. There is a clear need to improve understanding of the female reproductive organs in order that people, women in particular, can be better informed about cervical cancer and ultimately better receptive to intervention strategies.

Assisted vaginal delivery in low and middle income countries: an overview.

OBJECTIVE: To assess the use of assisted vaginal delivery (AVD) in low- and middle-income countries (LMICs), highlighting what level of care procedures were performed and identifying systemic barriers to its use. DESIGN: Cross-sectional health facility assessments. SETTING: Up to 40 countries in Latin America, sub-Saharan Africa and Asia. POPULATION: Assessments tended to be national in scope and included all hospitals and samples of midlevel facilities in public and private sectors. METHODS: Descriptive secondary data analysis. MAIN OUTCOME MEASURES: Percentage of facilities where health workers performed AVD in the 3 months prior to the assessment, instrument preference, which health workers performed the procedure, and reasons AVD was not practiced. RESULTS: Fewer than 20% of facilities in Latin America reported performing AVD in the last 3 months. In sub-Saharan Africa, 53% of 1728 hospitals had performed AVD but only 6% of nearly 10 000 health centres had done so. It was not uncommon to find <1% of institutional births delivered by AVD. Vacuum extraction appears preferred over forceps. Lack of equipment and trained health workers were the most frequent reasons for non-performance. CONCLUSIONS: The low use of AVD in LMICs is in contrast with many high-income countries, where high caesarean rates are also associated with significant rates of AVD. In many LMICs, rising caesarean rates have not been associated with maintenance of skills and practice of AVD. AVD is underused precisely in countries where pregnant women continue to face hardships accessing emergency obstetric care and where caesarean delivery can be relatively unsafe. TWEETABLE ABSTRACT: Many LMICs exhibit low use of assisted vaginal delivery where access to EmONC continues to be a hardship.

Field Evaluation of Xpert HPV Point-of-Care Test for Detection of Human Papillomavirus Infection by Use of Self-Collected Vaginal and Clinician-Collected Cervical Specimens.

The World Health Organization has recommended that testing for high-risk human papillomavirus (HPV) (hrHPV) infection be incorporated into cervical screening programs in all settings worldwide. In many high-burden, low-income countries, it will not be feasible to achieve high cervical screening coverage using hrHPV assays that require clinician-collected samples. We conducted the first evaluation of self-collected vaginal specimens compared with clinician-collected cervical specimens for the detection of hrHPV infection using the Xpert HPV test. Women aged 30 to 54 years attending two well-woman clinics in Papua New Guinea were invited to participate and provided self-collected vaginal and clinician-collected cervical cytobrush specimens. Both specimen types were tested at the point of care by using the Xpert HPV test. Women were given their cervical test result the same day. Those with a positive hrHPV test and positive examination upon visual inspection of the cervix with acetic acid were offered same-day cervical cryotherapy. A total of 1,005 women were enrolled, with 124 (12.3%; 95% confidence interval [CI], 10.3%, 14.4%) being positive for any hrHPV infection. There was a 99.4% overall percent agreement (OPA) between vaginal and cervical tests for HPV-16 (95% CI, 98.9%, 99.9%), a 98.5% OPA for HPV-18/45 (95% CI, 97.7%, 99.3%), a 94.4% OPA for other hrHPV infections (95% CI, 92.9%, 95.9%), and a 93.4% OPA for all hrHPV types combined (95% CI, 91.8%, 95.0%). Self-collected vaginal specimens had excellent agreement with clinician-collected cervical specimens for the detection of hrHPV infection using the Xpert HPV test. This approach provides for the first time an opportunity to incorporate point-of-care hrHPV testing into clinical cervical screening algorithms in high-burden, low-income settings.

Synthesis and microstructural studies of annealed Cu(2)O/Cu(x)S bilayer as transparent electrode material for photovoltaic and energy storage devices.

Cu2 O thin film and a transparent bilayer have been fabricated by electrodeposition method. The growths were obtained in potentiostatic mode with gradual degradation of anodic current. X-ray diffraction (XRD) study showed that the bilayer is polycrystalline and it possesses mixture of different crystallite phases of copper oxides. Surface morphology of the films was investigated by scanning electron microscopy (SEM). The SEM images revealed that the films were uniformly distributed and the starting material (Cu2 O) had cubical structure. Grains agglomeration and crystallinity were enhanced by annealing. Optical studies indicated that all the samples have direct allowed transition. Energy band gap of the bilayer film was reduced by annealing treatment thus corroborating quantum confinement upshot.

Operative vaginal delivery at Port Moresby General Hospital from 1977 to 2010.

This paper presents 35 years of history of operative vaginal delivery at the Port Moresby General Hospital (PMGH). From the early 1970s when Dr. G.C. Bird was appointed as Head of Obstetrics at PMGH, vacuum extraction has been the preferred method of assisted vaginal delivery. In the early 1970s, Dr Bird began to experiment with more effective configurations of the then standard metal Malmstrom vacuum extraction cup: the Bird anterior cup was introduced in 1973 and the posterior cup in 1974. These modifications to the vacuum extractor cup allowed for more effective placement of the cup on the flexion point on the fetal head thereby facilitating more successful vacuum-assisted delivery. Between 1977 and 2010 there were a total of 11,458 vacuum extractions (average rate 3.9%) performed, with an average failure rate of 2.5%. During the same period there were 565 vaginal forceps deliveries (rate 0.2%), 11,550 caesarean sections (rate 3.9%) and 182 symphysiotomies (all for failed vacuum extraction procedures) performed. Over the period trends that are noted include a slowly rising caesarean section rate from 2% in the 1970s to nearly 5% in the current decade. Over the same period the assisted vaginal delivery rate has dropped from 10-15% in the 1970s to 3-4% since 2000. The combined fresh stillbirth and early neonatal mortality rate for infants > or = 1.5 kg and > or = 2.5 kg for the period was 11.3/1000 and 9.5/1000 respectively, and compares to a combined fresh stillbirth and early neonatal mortality rate of 8.7/1000 for assisted vaginal delivery.

Poor weight gain in late third trimester: a predictor of poor perinatal outcome for term deliveries?

In many parts of the world weighing women in antenatal clinics is no longer thought to be important. At Port Moresby General Hospital we noticed that failure to gain weight in the third trimester (or weight loss) was associated with poor perinatal outcomes. To investigate this issue we designed a prospective case-control study to determine whether poor weight gain in the third trimester is a useful clinical indicator of poor placental function by being associated with intrauterine growth restriction (IUGR) or inadequate placental function in labour by being significantly associated with suspected intrapartum fetal compromise, birth asphyxia, meconium aspiration syndrome and neonatal intensive care unit admission. We found that a failure to gain weight for more than three weeks preceding the onset of labour was significantly associated with intrapartum fetal compromise (OR 2.24), IUGR (OR 2.88), meconium aspiration syndrome (OR 4.19), the presence of thick meconium or the passage of meconium during labour (OR 2.26) and the need for admission to the neonatal intensive care unit for more than 24 hours (OR 2.22). Weighing women in the antenatal clinic setting is a useful way of screening for deteriorating or inadequate placental function, and is particularly relevant in settings where more sophisticated modalities of screening and diagnosis of placental function are not available.

Rarity of JC virus DNA sequences and early proteins in human gliomas and medulloblastomas: the controversial role of JC virus in human neurooncogenesis.

JC virus (JCV), the agent of progressive multifocal leucoencephalopathy (PML), exerts an oncogenic effect in several laboratory animal models. Moreover, JCV genomic DNA and early viral protein T-antigen have been detected in various types of human central nervous system (CNS) neoplasms. To further explore this association we have studied paraffin-embedded brain biopsy tissue from 60 neoplasms (55 gliomas and five medulloblastomas) and 15 reactive gliosis cases for the presence of JCV DNA sequences and proteins. Four post mortem cases of HIV-associated PML were used as positive controls. Samples were assessed by polymerase chain reaction (PCR) amplification of early (large T antigen) and late (virion protein 3) sequences and immunohistochemistry (IHC) with both PAb 2024 and anti-SV40 large T antigen monoclonal antibodies. Five cases (three neoplasms and two reactive gliosis instances) showed low viral DNA levels when PCR-tested for VP3 or large T, while no case was immunoreactive for any of the two antibodies used. The four PML cases yielded positive results with both PCR and IHC. Additionally, IHC with both antibodies was applied to a tissue micro-array including 109 CNS tumours and 21 reactive gliosis samples. No immunoreactivity was detected in any of these tissue micro-array samples. The rarity of JCV DNA sequences and early proteins in our brain tumours enriches the controversy over the role of JCV in human neurooncogenesis, whose clarification is in need of further molecular and epidemiologic studies.

Attitudes towards death and dying in a representative sample of the Italian population.

This study investigated attitudes in Italy towards incurable disease, death and dying, and analyses the answers given to questions regarding the end of life and the care of the terminally ill patient. Of 1011 people invited to take part in this study, 829 (82%) agreed to participate. People were interviewed about the images associated with death (47% of those interviewed associated death with cancer); telling the truth to the dying patient (13% were in favour of being made aware of their impending death); the place of death (62% preferred home, 7% hospital); the attitudes of the carers (38% affirmed that pain should be alleviated, without considering the length of life, while 8% stated that they would be prepared to bear physical suffering if it meant prolongation of life) and religious faith (88% of those interviewed declared themselves Christian). Comparing our data with a previous survey, carried out in 1988, we conclude that only small changes have occurred in attitudes in the intervening 11 years: a slight increase in those who said that they think 'often' or 'sometimes' about death (53% in 1999, 44% in 1988) and an increase in the number of people who associate the causes of death with cancer (47% in 1999, 36% in 1988). The fear has diminished of AIDS (5% versus 8%) and war (5% versus 12%) as causes of death. It is concluded that such studies will serve not simply to provide indicators of public tendencies or public interest in the problem, but will constitute a tool whereby those attitudes which merit close observation can be identified and, where necessary, changed.

Anaemia and perinatal outcome in Port Moresby.

In 1987, a computerized obstetric database was set up at the Port Moresby General Hospital. Between 1987 and 1992, 27,117 births took place. The mean haemoglobin value amongst the 83% of women in whom a haemoglobin value was tested was 10.0 +/- 1.7 g/dL. High stillbirth rates (94 per 1,000) were associated with a haemoglobin value < 6 g/dL. The stillbirth rate was slightly lower (14 per 1,000) in woman whose lowest haemoglobin value was in the range 10.0-10.9 g/dL than in those with a haemoglobin value > or = 11 g/dL (18 per 1,000). The stillbirth rate was increased in women with haemoglobin values > or = 14.0 g/dL. With respect to low birth-weight (< 2,500 g), the rates were also higher when the haemoglobin value was above 14.0 g/dL. The reason for these findings is not apparent and may be due to the impact of an uncharacterized confounding variable rather than the haemoglobin value.

A survey of pregnant women with tuberculosis at the Port Moresby General Hospital.

From March 1995 to February 1998, 110 patients diagnosed with tuberculosis (TB) in pregnancy or the puerperium at the Port Moresby General Hospital (PMGH) were surveyed. 96% were diagnosed as a result of the symptoms of tuberculosis, 4% through contact tracing. 11 of 40 patients who first attended antenatal clinic in the second trimester were not diagnosed until after delivery. The mean birthweight of term infants of TB patients was significantly less than term infants in a previous survey at PMGH. 45% of babies were growth restricted. With increasing duration of treatment, both increasing maternal weight gain in pregnancy and higher mean birthweight were found. Maternal and perinatal mortality were high in the study patients. There were 6 maternal deaths and a perinatal mortality rate of 137/1000. The majority of maternal and fetal losses occurred in patients who had pulmonary, miliary and meningeal TB. Improvement in the detection of tuberculosis in antenatal patients and the introduction of adequate treatment before delivery should prevent maternal deaths and perinatal morbidity and mortality.

Reporting of lactation and normal menstrual information by Papua New Guinean women.

As part of a survey of 600 women enrolled in a study of postpartum progesterone-only contraception (400 women who opted to use progesterone-only contraception and 200 controls) participants were asked about menstrual history and lactation experience. The mean longest menstrual cycle duration was found to be 29.5+/-SD3.5 days and the mean shortest cycle duration was 26.6+/-SD2.8 days. The mean duration of menstrual bleeding was 3.75+/-SD1.16 days. Few women reported menstrual period problems such as dysmenorrhoea (6.5%) and menorrhagia with clots (0.7%). However, 3% of the women reported irregular cycles with intervals of longer than 1 month. Overall the women reported breastfeeding their previous baby for a mean duration of 14 months. The group of women electing to use hormonal contraception reported that they had breastfed their last baby for 13.5+/-SD7.5 months while control women had done so for 14.1+/-SD9.4 months. The longest mean duration that women reported to have breastfed a previous infant was 19.5+/-SD9.6 months in the hormonal contraception group and 19.1+/-SD8.6 months in the control group.

A case-control study of stillbirths at the Port Moresby General Hospital.

From September 1995 to May 1997, 315 consecutive stillbirths and 315 randomly selected controls were studied at the Port Moresby General Hospital to determine the causes of the deaths, to describe the sociodemographic and reproductive characteristics of the mothers, and to see if there were any avoidable factors in the stillbirths and where the responsibility for them lay. 249 (79%) of the stillbirths were antepartum and 14% were intrapartum; the timing of death could not be determined in the remaining 21 (7%). 36% of the stillbirths were unexplained. The common identified causes were: syphilis (VDRL and TPHA positive) 10%, intrauterine growth restriction/placental insufficiency 9%, antepartum haemorrhage 9%, malaria 6%, major congenital abnormalities 6%, cord accidents 6%, pregnancy-induced hypertension 5% and acute intrapartum asphyxia 4%. Multiple logistic regression analysis showed a significant association between stillbirth and the following variables: husband's occupation unskilled, age over 35 years, poor antenatal attendance, a past history of stillbirth, syphilis and malaria. An avoidable factor was established in 41% of the cases; in 60% the responsibility for the avoidable factor lay with the patient and her relatives.

A survey of under-18 year old and 20-29 year old primigravidae delivered at the Port Moresby General Hospital: a comparative study of their sociodemographic and sexuality characteristics and contraceptive knowledge and experience.

From July 1992 to August 1993, 330 under-18 year old primigravidae (cases) and 330 randomly selected 20-29 year old primigravidae (controls) who were delivered at the Port Moresby General Hospital were sequentially studied, using a standardized, pretested, precoded questionnaire. In stepwise logistic regression analysis, significantly more of the cases had menarche at less than 15 years of age, learned before menarche that sex causes pregnancy, were of highland origin, were unemployed, or had partners who were unemployed; significantly fewer of the cases thought that one sexual act could cause pregnancy, had knowledge of or had ever used a family planning method, or had planned this pregnancy.

PIP: This study aims to identify factors (explanatory variables) which are associated with the risk of an adolescent becoming pregnant. From July 1992 to August 1993, 330 18 year old primigravidas (cases) and 330 randomly selected 20-29 year old primigravidas (controls), who were delivered at the Port Moresby General Hospital in Papua New Guinea, were sequentially studied. Trained research assistants administered a standard, pretested, precoded questionnaire. By using stepwise logistic regression analysis, it was revealed that significantly more of the cases had menarche at 15 years of age (81% vs. 49%), learned before menarche that sex causes pregnancy (51% vs. 32%), were of highland origin, were unemployed, or had partners who were unemployed. Moreover, significantly fewer of the cases thought that one sexual act could cause pregnancy, had knowledge of or had ever used a family planning method, or had planned their pregnancy.

Familial ovarian cancer: report of ovarian carcinoma in three sisters.

This is a report of ovarian carcinoma occurring in two sisters diagnosed almost at the same time, prompting prophylactic oophorectomy in a third sister. Histology of the overtly normal ovary in the third sister showed a focus of ovarian cancer. Discussion and a review of the literature suggest that any program designed to reduce the incidence of late-stage ovarian carcinoma should include the surveillance of family members of the index case, including the performance of prophylactic oophorectomy in the unaffected members of the family after they have completed their families.

Attitudes toward euthanasia of physician members of the Italian Society for Palliative Care.

BACKGROUND: The problems related to requests for euthanasia by terminal patients; the variations in attitude of palliative care physicians and the possibility that availability of the best palliative care might obviate the problem by eliminating requests for euthanasia, are under discussion. DESIGN: A mailed survey with no possibility of follow-up of all 685 physician members of the Italian Society for Palliative Care (SICP) in 1994. RESULTS: Of the 359 (52.4%) responders, 139 (39%) had received requests for euthanasia; 16 of them (4% of the responders but 11.5% of those who received requests) had complied at least once, while 216 (60%) had not; 125 (35%) thought that euthanasia was 'wrong' under all circumstances; 115 (32%) thought that situations could occur, even in the context of palliative care, in which euthanasia might be ethically 'correct'; 185 (52%) thought that the best palliative care might solve the problem of euthanasia, while 109 (30%) believed otherwise. The variable most strongly associated with a negative attitude toward euthanasia and with the opinion that the best palliative care might be a solution to the problem is religious belief (P < 0.0001). CONCLUSIONS: The attitudes of physicians practising palliative care in Italy are not different from those reported by previous studies which investigated the attitude of other health professionals. There was no agreement about whether the best palliative care might reduce requests for euthanasia by terminal patients.

HIV infections in obstetrics and gynaecology.

Thirteen women were discovered to be positive for human immunodeficiency virus (HIV) infection during pregnancy at the Port Moresby General Hospital from 1988 to 1995; of these, eight were diagnosed in the first half of 1995. Risk testing for HIV status is unlikely to discover more than 20% of HIV-positive antenatal patients because risk factors target intravenous drug users and the sexual behaviour of men. Pregnancy does not seem to have a major impact on the progress of HIV disease, but could be detrimental particularly in the later stages of the disease. Especially in developing countries, where HIV-positive patients are more likely to be of poor nutritional status and burdened with a number of other infections, there is a higher risk of preterm labour, small-for-dates babies and chorioamnionitis in pregnancy. The risk of vertical transmission is increased when viral loads are high, the general maternal condition is poor and delivery is preterm. Rates in Papua New Guinea appear to be following the higher rates which have been reported from Africa. Gynaecological conditions found in association with HIV infection, including pelvic inflammatory disease, vulvovaginal candidiasis and cervical neoplasia, may be resistant to treatment and tend to recur. Contraception for HIV-positive women may be more important to them than prevention of viral transmission; Depo-Provera and tubal ligation have special benefits in this regard. HIV infection in association with psychiatric disturbance might be an indication for termination of pregnancy.

PIP: Risk testing for HIV serostatus is unlikely to detect more than 20% of HIV-positive pregnant women. Of the 11 pregnant women discovered to be HIV-infected at Port Moresby General Hospital in Papua New Guinea in 1994-95, only four had more than two sexual partners since 1992 and none was an intravenous drug user. The deleterious effect of pregnancy on HIV disease progression appears to be small but variable, with more serious effects in the later stages of disease. The risk of vertical transmission increases when viral loads are high, the general maternal condition is poor, and delivery is preterm. In developing countries, where HIV-infected pregnant women are likely to be malnourished and to have concomitant infections such as malaria and tuberculosis, the risks of preterm labor, small-for-gestational age infants, and chorioamnionitis are increased. HIV-related gynecologic conditions such as pelvic inflammatory disease, vulvovaginal candidiasis, and cervical neoplasia may be resistant to treatment and tend to recur. Pregnancy prevention through effective contraceptive methods such as Depo-Provera and tubal ligation may be more important to HIV-infected women than prevention of viral transmission, especially when both partners are seropositive.

Simplified care of women with prolonged or persistent retention of the placenta: the use of paracervical block.

Thirty patients with prolonged or persistent retention of the placenta were randomized to either paracervical block or intravenous cocktail of pethidine and diazepam. When paracervical block worked, the analgesia produced was better than that usually achieved with intravenous cocktail of pethidine and diazepam. From a cost-benefit point of view paracervical block is preferable to intravenous cocktail. No significant side-effects occurred during the trial.