BACKGROUND & AIMS: :Familial Mediterranean Fever is a genetically determined disease occurring predominantly in Arabs, Armenians, Jews and very rarely in Turks. It is characterized by moderately elevated body temperature and by abdominal, pulmonary or arthritic complaints. These symptoms are recurrent appearing at short intervals and persisting for not more than two days. Renal amyloidosis may be a complication. Thus, treatment should be continued for life. The pathomechanism of the disease is not clear. Colchicine has been shown to give good symptomatic relief. Surprisingly, the prolonged use of this mitotic poison is virtually devoid of untoward side effects, even in pregnancy and childhood.

背景与目标： : 家族性地中海发热是一种由遗传决定的疾病，主要发生在阿拉伯人，亚美尼亚人，犹太人中，很少发生在土耳其人中。它的特征是适度升高的体温和腹部，肺部或关节炎的不适。这些症状是反复出现的，间隔很短，持续不超过两天。肾淀粉样变性可能是一种并发症。因此，治疗应该终身继续。该疾病的病理机制尚不清楚。秋水仙碱已显示出良好的症状缓解。令人惊讶的是，即使在怀孕和儿童时期，长期使用这种有丝分裂毒药实际上也没有不良副作用。

BACKGROUND & AIMS: OBJECTIVES:To examine the effects of ill health on selection into paid employment in European countries. METHODS:Five annual waves (1994-8) of the European Community Household Panel were used to select two populations: (1) 4446 subjects unemployed for at least 2 years, of which 1590 (36%) subjects found employment in the next year, and (2) 57 436 subjects employed for at least 2 years, of which 6191 (11%) subjects left the workforce in the next year because of unemployment, (early) retirement or having to take care of household. The influence of a perceived poor health and a chronic health problem on employment transitions was studied using logistic regression analysis. RESULTS:An interaction between health and sex was observed, with women in poor health (odds ratio (OR) 0.4), men in poor health (OR 0.6) and women (OR 0.6) having less chance to enter paid employment than men in good health. Subjects with a poor health and low/intermediate education had the highest risks of unemployment or (early) retirement. Taking care of the household was only influenced by health among unmarried women. In most European countries, a poor health or a chronic health problem predicted staying or becoming unemployed and the effects of health were stronger with a lower national unemployment level. CONCLUSION:In most European countries, socioeconomic inequalities in ill health were an important determinant for entering and maintaining paid employment. In public health measures for health equity, it is of paramount importance to include people with poor health in the labour market.

背景与目标：

BACKGROUND & AIMS: OBJECTIVES:To investigate which characteristics of women and healthcare professionals (HCPs) were associated with changing to another combined hormonal contraceptive (CHC) method after contraceptive counselling. METHODS:CHOICE was a cross-sectional survey in which 18,787 women were counselled about combined hormonal contraceptives, during which their contraceptive methods preferred both prior to and after counselling were recorded. In this subanalysis, characteristics associated with changing the method after counselling were determined using logistic regression models. RESULTS:The probability of intending to change from the pill to another method was associated with being older; university-educated; being in a steady relationship; a prior unintended pregnancy; a younger HCP or one who recommended methods other than the pill. Changing to the patch was associated with a female HCP or a HCP who recommended the patch or an injectable. Changing to the ring was associated with being over 21 years; university-educated; being in a relationship; previous hormonal method use; and counselling by a female HCP, a HCP < 60 years old, or a HCP who recommended the ring or an implant. The country of residence influenced these changes in a complex pattern. CONCLUSIONS:Women's choice of CHC methods after contraceptive counselling are influenced by their age, educational background, relationship status, prior unplanned pregnancies and country of residence, as well as age, gender and preferences of their HCP.

背景与目标：

BACKGROUND & AIMS: :The World Health Organization European Region has one of the highest rates of multidrug-resistant tuberculosis (MDR-TB) in the world, resulting in many vulnerable children being exposed each year. Evidence for preventive therapy following MDR-TB exposure is limited and current guidance is conflicting. An internet-based survey was performed to determine clinical practice in this region. Seventy-two clinicians from 25 countries participated. Practices related to screening and decision-making were highly variable. Just over half provided preventive therapy for children exposed to MDR-TB; the only characteristic associated with provision was practice within the European Union (adjusted OR 4.07, 95%CI 1.33-12.5).

背景与目标： : 世界卫生组织欧洲地区是世界上耐多药结核病 (mdr-tb) 发病率最高的地区之一，每年都有许多易受感染的儿童。耐多药结核病暴露后预防性治疗的证据有限，目前的指导意见存在矛盾。进行了基于互联网的调查，以确定该地区的临床实践。来自25个国家的72名临床医生参加了会议。与筛选和决策相关的实践变化很大。刚刚超过一半的人为暴露于耐多药结核病的儿童提供了预防性治疗; 与提供相关的唯一特征是欧盟内部的实践 (调整或4.07，95% CI 1.33-12.5)。

BACKGROUND & AIMS: :Habitat destruction has resulted in the extinction of many plant species from the earth, and many more face extinction. Likely, the annual endemic Mediterranean knapweed (Centaurea tchihatcheffii) growing in the Golbasi district of Ankara, Turkey is facing extinction and needs urgent conservation. Plant tissue culture, a potentially useful technique for ex situ multiplication, was used for the restoration of this ill-fated plant through seed germination, micropropagation from stem nodes, and adventitious shoot regeneration from immature zygotic embryos. The seeds were highly dormant and very difficult to germinate. No results were obtained from the micropropagation of stem nodes. However, immature zygotic embryos showed the highest adventitious shoot regeneration on Murashige and Skoog (MS) medium, containing 1 mg l(-1) kinetin and 0.25 mg l(-1) NAA. Regenerated shoots were best rooted on MS medium containing 1 mg l(-1) IBA and transferred to the greenhouse for flowering and seed set. As such, the present work is the first record of in vitro propagation of critically endangered C. tchihatcheffii, using immature zygotic embryos, and is a step forward towards conservation of this indigenous species.

背景与目标： : 栖息地的破坏导致许多植物物种从地球上灭绝，更多的植物面临灭绝。可能，在土耳其安卡拉Golbasi区生长的一年一度的地中海特有种 (Centaurea tchihatcheffii) 正面临灭绝，需要紧急保护。植物组织培养是一种可能用于异位繁殖的有用技术，用于通过种子发芽，茎节微繁殖以及未成熟合子胚的不定芽再生来恢复这种命运不佳的植物。种子高度休眠，很难发芽。没有从茎节的微繁殖获得结果。然而，未成熟的合子胚在Murashige和Skoog (MS) 培养基上显示出最高的不定芽再生，其中含有1 mg l(-1) 激动素和0.25 mg l(-1) NAA。再生的芽最好在含有1 mg l(-1) IBA的MS培养基上生根，然后转移到温室中进行开花和结实。因此，目前的工作是使用未成熟合子胚对极度濒危的tchihatcheffii进行体外繁殖的第一个记录，并且是朝着保护该土著物种迈出的一步。

BACKGROUND & AIMS: :Recognizing that robust information on health systems in other countries can provide valuable lessons for the English National Health Service, the Department of Health commissioned an academic team to provide an 'On-call Facility for International Healthcare Comparisons' in 2005. This paper describes the work of this novel approach to informing policy and reviews the experience of the first two years. It illustrates the well-documented challenges of comparative analysis of health systems. One important issue is understanding the health system context so as to interpret phenomena and draw appropriate policy conclusions. Other challenges include the potential tension between academic interest and rigour, and the need for timely analysis to inform the Department of Health's rapidly changing policy agenda. The diversity and nature of topics covered, as well as the rapid turn-around time have meant that the Facility has had to balance rigour and timeliness carefully to ensure the value and relevance of reports. A strong research base linked with an international network of country experts promotes the provision of high quality analyses at relatively low costs. However, such an arrangement can only be sustained if it provides scope for additional primary research. A formal evaluation of the influence on health care policy-making in England is not yet available. Such knowledge will be of crucial importance for the development of similar resources elsewhere.

背景与目标： : 认识到其他国家卫生系统的可靠信息可以为英国国家卫生服务局提供宝贵的经验教训，卫生部委托一个学术团队为国际医疗保健比较提供 “随叫随到的设施” 2005年。本文介绍了这种新颖的政策通报方法的工作，并回顾了前两年的经验。它说明了卫生系统比较分析的有据可查的挑战。一个重要的问题是了解卫生系统的背景，以便解释现象并得出适当的政策结论。其他挑战包括学术兴趣和严谨之间的潜在紧张关系，以及需要及时分析以告知卫生部迅速变化的政策议程。所涵盖主题的多样性和性质以及快速的周转时间意味着该设施必须仔细平衡严谨性和及时性，以确保报告的价值和相关性。与国际国家专家网络相联系的强大研究基础促进以相对较低的成本提供高质量的分析。然而，这种安排只有在为额外的初级研究提供空间的情况下才能持续下去。尚未对英格兰对医疗保健政策制定的影响进行正式评估。这些知识对于在其他地方开发类似资源至关重要。

BACKGROUND & AIMS: :Sicilian reservoirs constitute the most important water resources available on the island. During summer 2001, the intense water utilization of Lake Arancio reservoir reduced the water level significantly, which coincided with the formation of intense blooms formed by the microcystin (MC)-producing cyanobacterium Microcystis aeruginosa. During summer 2003, Lake Arancio was continuously filled and the vertical stratification of the water column was maintained resulting in five to sixfold lower cell numbers of M. aeruginosa. For both years, a significant relationship between MC net production and Microcysytis cell growth was observed, implying that Microcystis cell numbers can be used to infer MC concentrations in water. Unexpectedly, dense blooms of the MC-producing cyanobacterium Planktothrix rubescens occurred during winter 2005/2006 in the reservoirs Lake Pozzillo, Prizzi, Nicoletti, and Garcia but have not been reported earlier. In this season, MC concentrations higher than those recorded in summer were measured, implying that monitoring of Mediterranean drinking water reservoirs needs to be intensified during winter, a season usually considered to be less prone to the formation of cyanobacterial blooms.

背景与目标： : 西西里水库是岛上最重要的水资源。在夏季2001，阿兰西奥湖水库的强烈水分利用显着降低了水位，这与产生微囊藻毒素 (MC) 的蓝藻铜绿微囊藻形成的强烈水华形成相吻合。在夏季2003，阿兰西奥湖持续充满，并保持水柱的垂直分层，导致铜绿假单胞菌的细胞数降低了五到六倍。在这两年中，观察到MC净产生与微囊炎细胞生长之间存在显着关系，这意味着微囊藻细胞数量可用于推断水中的MC浓度。出乎意料的是，冬季2005/2006期间，在Pozzillo湖，Prizzi，Nicoletti和Garcia的水库中发生了产生MC的蓝藻蓝藻的密集开花，但尚未有报道。在这个季节，测量的MC浓度高于夏季记录的MC浓度，这意味着在冬季需要加强对地中海饮用水水库的监测，而冬季通常被认为不太容易形成蓝藻水华。

BACKGROUND & AIMS: STUDY QUESTION:Is there an association between polycystic ovary syndrome (PCOS) and the sex hormone-binding globulin (SHBG) rs1799941, rs6257, rs6259 and rs727428 variants in a large series of Mediterranean women? SUMMARY ANSWER:The rs727428 and rs6259 variants are associated with PCOS in Mediterranean women. WHAT IS KNOWN ALREADY:The level of SHBG, the primary plasma transport protein for sex steroids, which regulates the bioavailability of these hormones to target tissues, is reduced in patients with PCOS. Single-nucleotide polymorphisms in the SHBG gene influence circulating SHBG levels in American patients with PCOS and may predict the development of type 2 diabetes. STUDY DESIGN, SIZE AND DURATION:This was a genetic case-control association study including 1004 premenopausal Mediterranean women. PARTICIPANTS/MATERIALS, SETTING AND METHODS:In an Academic setting, we genotyped a clinical cohort consisting of 281 patients with PCOS and 142 women without any evidence of androgen excess, and a population-based cohort comprised of 581 unselected female blood donors from Spain and Italy. The latter included 31 patients with PCOS and 550 controls, of whom 298 had no evidence of any androgen excess disorder and were considered hyper-normal controls. MAIN RESULTS AND THE ROLE OF CHANCE:Mutant alleles of the rs727428 variant were more frequent in patients with PCOS compared with controls and with hyper-normal controls. This association was independent of obesity. Carrying mutant alleles of rs727428 was found to be associated with a 1.29 odds ratio (OR) for PCOS, whereas carrying mutant alleles of rs6259 associated with a 0.68 OR for PCOS. The rs1799941 and rs6257 variants were not associated with PCOS. None of the SHBG variants influenced serum SHBG concentrations. LIMITATIONS AND REASONS FOR CAUTION:The associations found here were relatively weak and, arising from a case-control study, do not necessarily indicate a causative role of the SHBG variants in the development of PCOS. Also, we studied different patients and controls from different sources, making some of the interpretations difficult. Finally, the rs1799941 variant was not in Hardy-Weinberg equilibrium in the small group of patients with PCOS recruited from the general population, yet this variant was not associated with PCOS. WIDER IMPLICATIONS OF THE FINDINGS:SHBG variants that influenced circulating SHBG levels in American patients with PCOS are also associated with this syndrome in Mediterranean women, pointing to SHBG as a candidate gene for PCOS. STUDY FUNDING/COMPETING INTEREST(S):This study was supported by grants PI080944 and PI110357 from Instituto de Investigación Carlos III, Spanish Ministry of Economy and Competitiveness. CIBERDEM is also an initiative of Instituto de Investigación Carlos III. The Authors have no competing interests to declare.

背景与目标：

BACKGROUND & AIMS: BACKGROUND:Meta-analyses enable summarization and interpretation of data across clinical trials. When applied to safety data they allow for detection of rare events. Recently, a 13-valent pneumococcal conjugate vaccine (PCV13) was approved in multiple countries worldwide for routine immunization of infants and young children. This meta-analysis was conducted to identify potentially clinically important rare safety events associated with PCV13. OBJECTIVE:To summarize the safety of PCV13 compared with 7-valent pneumococcal conjugate vaccine (PCV7) administered to infants and toddlers. METHODS:A meta-analysis was performed of integrated safety data from 13 infant studies (PCV13 n=4729 and PCV7 n=2760) conducted in 9 North American, European, and Asian countries. Local reactions at the vaccine injection site and systemic events were collected for 4-7 days after each dose into electronic diaries. Adverse events (AEs) were collected after each vaccination. RESULTS:Overall, rates of local reactions after any dose of the infant series were similar between PCV13 and PCV7 groups: tenderness (46.7% vs 44.8%, respectively); swelling (28.5% vs 26.9%); and redness (36.4% vs 33.9%). After the toddler dose, tenderness was significantly higher among PCV7 subjects than PCV13 subjects (54.4% vs 48.8%; P=0.005). Frequencies of fever (≥38°C) were similar in both groups and mostly mild (≤39°C); incidence of moderate fever (>39°C to ≤40°C) with PCV13 was ≤2.8% after any infant dose and 5.0% after the toddler dose, compared with ≤2.6% and 7.3%, respectively, with PCV7. Fever >40°C was uncommon in both groups. Frequencies of decreased appetite, irritability, and sleep disturbances were similar in both groups. AEs were the types of conditions and symptoms expected in infants and children, and clinically significant differences between vaccine groups were not observed. CONCLUSION:PCV13 has a favorable safety profile similar to that of PCV7, a vaccine for which there is >10 years clinical experience.

背景与目标：

BACKGROUND & AIMS: :We have conducted a systematic review to update available information on plasmid-mediated colistin resistance (mobilized colistin resistance [mcr]) genes in North African countries. We have searched the articles of PubMed, Scopus, and Web of Science databases reporting plasmid-mediated colistin resistance bacteria isolated in North African countries. After searching and selection, 30 studies that included 208 mcr-positive isolates were included. Different mcr-positive strains frequencies were recorded and ranged from 2% in clinical isolates to 12.3% in environmental samples. Escherichia coli was the predominant species recorded and these microorganisms showed high resistance to ciprofloxacin and cotrimoxazole. IncHI2 plasmids are probably the key vectors responsible for the dissemination of mcr genes in these countries. This review highlighted that the mcr-positive isolates are circulating in different ecological niches with different frequencies. Therefore, actions should be implemented to prevent the dissemination of the mcr genes within and outside of these countries, such as microbiological and molecular surveillance programs and restriction use of colistin in farming.

背景与目标： : 我们已经进行了系统的审查，以更新有关北非国家中质粒介导的粘菌素抗性 (动员粘菌素抗性 [mcr]) 基因的可用信息。我们搜索了PubMed，Scopus和Web of Science数据库的文章，这些数据库报告了在北非国家分离的质粒介导的粘菌素抗性细菌。经过搜索和选择，包括208个mcr阳性分离株的30项研究被纳入。记录了不同的mcr阳性菌株频率，范围从临床分离株中的2% 到环境样品中的12.3%。大肠杆菌是记录的主要物种，这些微生物对环丙沙星和复方新诺明表现出很高的抗性。IncHI2质粒可能是在这些国家/地区传播mcr基因的关键载体。这篇评论强调了mcr阳性分离株以不同的频率在不同的生态位中循环。因此，应采取行动防止mcr基因在这些国家内外的传播，例如微生物和分子监测计划以及在农业中限制使用粘菌素。

BACKGROUND & AIMS: Background:Health information exchange (HIE) is frequently cited as an important objective of health information technology investment because of its potential to improve quality, reduce cost, and increase patient satisfaction. In this paper we examine the status and practices of HIE in six countries, drawn from a range of higher and lower income regions. Methods:For each of the countries represented - China, England, India, Scotland, Switzerland, and the United States - we describe the state of current practice of HIE with reference to two scenarios: transfer of care and referral. For each country we discuss national objectives, barriers and plans for further advancing clinical information exchange. Results:The countries vary widely in levels of adoption of EHRs, availability of health information in electronic form suitable for HIE, and in the information technology infrastructure to be used for transmission. Common themes emerged, however, including an expectation that information will be exchanged rather than gathered anew, the need for incentives to promote information exchange, and concerns about data security and patient confidentiality. Conclusions:Although the ability to transfer health information to where it is most needed is nearly always mentioned as an advantage of HIE adoption, there are wide differences in the degree to which this has been achieved to support the scenarios used in this study. Nevertheless, these differences indicate varying stages of progress along a comparable pathway, with similar barriers being identified in the countries described. In some cases, these have been partially surmounted while elsewhere work is needed. We reflect on contextual factors influencing the status and direction of HIE efforts in different global regions and their implications for progress.

背景与目标：

BACKGROUND & AIMS: Importance:Depression is associated with incidence of and premature death from cardiovascular disease (CVD) and cancer in high-income countries, but it is not known whether this is true in low- and middle-income countries and in urban areas, where most people with depression now live. Objective:To identify any associations between depressive symptoms and incident CVD and all-cause mortality in countries at different levels of economic development and in urban and rural areas. Design, Setting, and Participants:This multicenter, population-based cohort study was conducted between January 2005 and June 2019 (median follow-up, 9.3 years) and included 370 urban and 314 rural communities from 21 economically diverse countries on 5 continents. Eligible participants aged 35 to 70 years were enrolled. Analysis began February 2018 and ended September 2019. Exposures:Four or more self-reported depressive symptoms from the Short-Form Composite International Diagnostic Interview. Main Outcomes and Measures:Incident CVD, all-cause mortality, and a combined measure of either incident CVD or all-cause mortality. Results:Of 145 862 participants, 61 235 (58%) were male and the mean (SD) age was 50.05 (9.7) years. Of those, 15 983 (11%) reported 4 or more depressive symptoms at baseline. Depression was associated with incident CVD (hazard ratio [HR], 1.14; 95% CI, 1.05-1.24), all-cause mortality (HR, 1.17; 95% CI, 1.11-1.25), the combined CVD/mortality outcome (HR, 1.18; 95% CI, 1.11-1.24), myocardial infarction (HR, 1.23; 95% CI, 1.10-1.37), and noncardiovascular death (HR, 1.21; 95% CI, 1.13-1.31) in multivariable models. The risk of the combined outcome increased progressively with number of symptoms, being highest in those with 7 symptoms (HR, 1.24; 95% CI, 1.12-1.37) and lowest with 1 symptom (HR, 1.05; 95% CI, 0.92 -1.19; P for trend < .001). The associations between having 4 or more depressive symptoms and the combined outcome were similar in 7 different geographical regions and in countries at all economic levels but were stronger in urban (HR, 1.23; 95% CI, 1.13-1.34) compared with rural (HR, 1.10; 95% CI, 1.02-1.19) communities (P for interaction = .001) and in men (HR, 1.27; 95% CI, 1.13-1.38) compared with women (HR, 1.14; 95% CI, 1.06-1.23; P for interaction < .001). Conclusions and Relevance:In this large, population-based cohort study, adults with depressive symptoms were associated with having increased risk of incident CVD and mortality in economically diverse settings, especially in urban areas. Improving understanding and awareness of these physical health risks should be prioritized as part of a comprehensive strategy to reduce the burden of noncommunicable diseases worldwide.

背景与目标：

BACKGROUND & AIMS: BACKGROUND:The Mediterranean diet is one of the healthier diet models. Mediterranean food patterns are suffering a deterioration that can especially affect children and adolescents. OBJECTIVE:Determine adherence to the Mediterranean diet in adolescents of southern Spain and its relationship with the residence area, sex, age, life satisfaction, anthropometry, and habits of physical activity and sedentary activities. METHODOLOGY:A total of 1973 adolescents (11-18 years) of southern Spain participated in this descriptive cross-sectional study. Cut-off value between rural and urban locations was 10000 inhabitants. Adherence to the Mediterranean diet was calculated from the KIDMED questionnaire. Life satisfaction, physical activity, and sedentary activities also were measured through valid and reliable questionnaires. Body mass index and % body fat were measured using the TANITA BC-420-S body analyzer. RESULTS:30.9% of the adolescents reported an optimal quality diet, percent higher in rural locations (P < 0.05). Adherence was lower in older adolescents (P < 0.001), it was not different between sexes or according to anthropometric variables. Adolescents more satisfied with their lives (P < 0.001), more active (P < 0.001), more studious (P < 0.001), and less sedentary in front of a screen (P < 0.001) showed greater adherence to the Mediterranean food pattern. CONCLUSION:The majority of adolescents need to improve their nutritional quality. Compared with these subjects, the adolescents most adherent to the Mediterranean diet had a healthier lifestyle and they showed greater life satisfaction. :Introducción: La dieta mediterránea es uno de los modelos más saludables de dieta. Los patrones alimentarios mediterráneos están sufriendo un deterioro que puede afectar especialmente a niños y adolescentes. Objetivo: Determinar la adherencia a la dieta mediterránea de los adolescentes del sur de España y su relación con el área de residencia, sexo, edad, satisfacción con la vida, características antropométricas y hábitos de actividad física y sedentaria. Métodos: Un total de 1.973 adolescentes (11-18 años) del sur de España participaron en este estudio descriptivo transversal. El punto de corte entre poblaciones rurales y urbanas fue 10.000 habitantes. La adherencia a la dieta mediterránea fue calculada a partir del cuestionario KIDMED. Satisfacción con la vida, actividad física y sedentarismo también mediante cuestionarios fiables y válidos. Índice de masa corporal y % de grasa corporal fueron medidos utilizando el analizador corporal TANITA BC-420-S. Resultados: El 30,9% de los adolescentes reportó una dieta de calidad óptima, porcentaje superior en poblaciones rurales (P < 0,05). La adherencia fue menor en los adolescentes de mayor edad (P < 0,001), sin diferir entre sexos ni según las variables antropométricas. Los adolescentes más satisfechos con sus vidas (P < 0,001), más activos (P < 0,001), más estudiosos (P < 0,001) y menos sedentarios delante de una pantalla (P < 0,001) mostraron mayor adherencia al patrón alimentario mediterráneo. Conclusión: La mayoría de adolescentes necesitan mejorar su calidad nutricional. En comparación con estos sujetos, los más adheridos a la dieta mediterránea llevaban un estilo de vida más saludable y mostraron mayor satisfacción con sus vidas.

背景与目标：

BACKGROUND & AIMS: :The Bemisia tabaci Mediterranean (MED) cryptic species has been rapidly invading most parts of the world owing to its strong ecological adaptability, particularly its strong resistance to temperature stress. Epigenetic mechanisms play important roles in mediating ecological plasticity. In particular, DNA methylation has been the focus of attempts to understand the mechanism of phenotypic plasticity. The relationship between temperature and DNA methylation and how it affects the adaptability of invasive insects remain unknown. To investigate the temperature resistance role of DNA methyltransferase 1 (Dnmt1) in MED, we cloned and sequenced BtDnmt1 homology and identified its functions under various temperature conditions. The full-length cDNA of MED BtDnmt1 homology was 5,958 bp and has a 4,287 bp open reading frame that encodes a 1,428-amino-acid protein. BtDnmt1 mRNA expression levels were significantly down-regulated after feeding with dsRNA. Furthermore, after feeding with dsBtDnmt1, the MED adults exhibited significantly higher mortality under temperature stress conditions than the controls, suggesting that MED BtDnmt1 homology plays an essential role in the temperature tolerance capacity of MED. Our data improve our understanding of the temperature resistance and temperature adaptability mechanisms that have allowed the successful invasion and colonization of various environments by this alien species.

背景与目标： : 烟粉虱地中海 (MED) 隐秘物种由于其强大的生态适应性，特别是对温度胁迫的抵抗力，已迅速入侵世界大部分地区。表观遗传机制在介导生态可塑性中起着重要作用。特别是，DNA甲基化一直是试图理解表型可塑性机制的重点。温度与DNA甲基化之间的关系以及它如何影响入侵昆虫的适应性仍然未知。为了研究DNA甲基转移酶1 (Dnmt1) 在MED中的耐温作用，我们克隆并测序了BtDnmt1同源性，并鉴定了其在各种温度条件下的功能。MED BtDnmt1同源性的全长cDNA为5,958  bp，并具有编码1,428氨基酸蛋白的4,287  bp开放阅读框。喂食dsRNA后，BtDnmt1 mRNA表达水平显着下调。此外，用dsBtDnmt1喂养后，MED成年人在温度胁迫条件下的死亡率明显高于对照组，这表明MED BtDnmt1同源性在MED的温度耐受能力中起着至关重要的作用。我们的数据提高了我们对耐温性和温度适应性机制的理解，这些机制使这种外来物种成功地入侵和定居了各种环境。

BACKGROUND & AIMS: AIMS:The factors contributing to the establishment of high-quality radiotherapy services in low- and middle-income countries (LMICs) are poorly understood. The aim was to identify and describe barriers and facilitators to establishing and sustaining high-quality and accessible radiotherapy services in LMICs based on the experience of successful and unsuccessful attempts. METHODS:An exploratory-descriptive qualitative study using semistructured telephone interviews was undertaken. Purposive and snowball sampling techniques were used to recruit participants. The World Health Organization Innovative Care for Chronic Conditions Framework informed the interview guide. A constant comparative data analysis approach was adopted. FINDINGS:Seventeen participants were interviewed. Ten were working permanently in nine LMICs and seven were permanently employed in four high-income countries. Three themes were developed: committing to a vision of improving cancer care; making it happen and sustaining a safe service; and leveraging off radiotherapy to strengthen integrated cancer care. Identified barriers included lack of political leadership continuity, lack of a coordinated advocacy effort, non-Member State of the IAEA, lack of reliable epidemiological data, lack of a comprehensive budget and lack of local expertise. Facilitators identified included strong political support, vision champion, availability of a regulator, costed cancer control plan, diversified sources of funding, responsible project manager, adoption of evidence-based practice, strategic partnerships, motivation to provide patient-centered care, and availability of supportive technology. CONCLUSIONS:Assessing the level of readiness to establish and sustain a radiotherapy service is highly recommended. Future research is recommended to develop a readiness assessment tool for radiotherapy services implementation at LMICs.

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