Birth Environment Research Articles

Probing the Galactic halo with RR Lyrae stars – V. Chemistry, kinematics, and dynamically tagged groups

ABSTRACT We employ a sample of 135 873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from the newly calibrated P–ϕ31–R21–[Fe/H] and Gaia G band P–R21–[Fe/H] absolute magnitude–metallicity relations of Li et al., combined with available proper motions from Gaia EDR3, and 6955 systemic radial velocities from Gaia DR3 and other sources, in order to explore the chemistry and kinematics of the halo of the Milky Way (MW). This sample is ideally suited for characterization of the inner- and outer-halo populations of the stellar halo, free from the bias associated with spectroscopically selected probes, and for estimation of their relative contributions as a function of Galactocentric distance. The results of a Gaussian mixture model analysis of these contributions are broadly consistent with other observational studies of the halo, and with expectations from recent MW simulation studies. We apply the hdbscan clustering method to the specific energies and cylindrical actions (E, Jr, Jϕ, Jz), identifying 97 dynamically tagged groups (DTGs) of RRLs, and explore their associations with recognized substructures of the MW. The precise photometric-distance determinations (relative distance errors on the order of 5 per cent or better), and the resulting high-quality determination of dynamical parameters, yield highly statistically significant (low) dispersions of [Fe/H] for the stellar members of the DTGs compared to random draws from the full sample, indicating that they share common star-formation and chemical histories, influenced by their birth environments.

Informing about childbirth without increasing anxiety: a qualitative study of first-time pregnant women and partners’ perceptions and needs

BackgroundComplications requiring medical interventions during childbirth are far from rare, even after uncomplicated pregnancies. It is often a challenge for maternity healthcare professionals to know how to prepare future parents for these eventualities without causing unnecessary anxiety. Studies on traumatic birth experiences have shown that feelings of loss of control, insufficient information, and lack of participation in medical decisions during childbirth are factors of difficult experiences. However, little is known about the information and communication needs of expectant parents about childbirth during the prenatal period. To gain a deeper understanding of the information and communication needs of first-time pregnant women and partners, we explored their perceptions and expectations for their upcoming childbirth, and the actions they initiated to prepare for it.MethodsSemi-structured interviews were conducted individually with first-time pregnant women and partners of pregnant women aged 18 years or older, with an uncomplicated pregnancy. Thematic analysis was used to identify themes and sub-themes.ResultsTwenty expectant parents (15 pregnant women and five partners of pregnant women) were interviewed. Six themes were identified: Childbirth event; Childbirth experience; Childbirth environment; Organisation of care; Participation in decision making; Roles within the couple and transition to parenthood.ConclusionsThis study contributes to a better understanding of the information needs of future parents expecting their first child. Results highlighted that the notion of “childbirth risks” went beyond the prospect of complications during birth, but also encompassed concerns related to a feeling of loss of control over the event. Expectant parents showed an ambivalent attitude towards consulting risk information, believing it important to prepare for the unpredictability of childbirth, while avoiding information they considered too worrying. They expressed a desire to receive concrete, practical information, and needed to familiarise themselves in advance with the birth environment. Establishing a respectful relationship with the healthcare teams was also considered important. The findings suggest that information on childbirth should not be limited to the transmission of knowledge, but should primarily be based on the establishment of a relationship of trust with healthcare professionals, taking into account each person’s individual values and expectations.

Setting up a specialized maternity unit in a tertiary hospital: An oasis for pregnant women with COVID-19 during the pandemic

ObjectiveThe COVID-19 pandemic has had an enormous impact on society and the medical environment in Taiwan in 2022. As pregnant women with COVID-19 are at higher risk for multiple complications, Taiwan needs a COVID-19 specialized maternity unit to improve the quality of maternal and neonatal care. Materials and methodsWe share our experience with specialized maternity unit for pregnant women with COVID-19 at the National Cheng Kung University Hospital, where we can have careful evaluation, safe birth, and comprehensive postpartum care. ResultsOur COVID-19 specialized maternity unit enrolled 253 pregnant women with COVID-19, 90 (35.6%) pregnant women were admitted to the specialized maternity unit, and 71 (28.1%) pregnant women gave birth during hospitalization in two months. All pregnant women recovery well and real-time polymerase chain reaction tests on all infants were negative for COVID-19. ConclusionA specialized maternity unit can provide pregnant women with a safe birth environment, immediate maternity care, and high medical quality. It can also help health workers in non-specialized maternity units deal with COVID-19-related psychological stress. Therefore, setting up one specialized maternity unit in the city during the pandemic should be guardedly considered.

Midwifery students' opinions about episiotomy training and using virtual reality: A qualitative study

BackgroundThe use of simulations and digital technologies in education in the health field is common. Virtual reality technologies, which offer three-dimensional (immersive) simulation environments, have become easily accessible and cost-effective in recent years and this has this has increased this use of this technology in educating students who will work in the health field. ObjectivesThe aim of the study was to investigate the views of midwifery undergraduate students about the current episiotomy education they received and their expectations when related education is given with virtual reality technology. ParticipantsStudents in their third or fourth year of undergraduate midwifery who have taken prior episiotomy education. DesignThe research was carried out as a phenomenological design for qualitative research. Data were collected between December 2022 and January 2023 at a public university in Türkiye, with institutional ethical approval. MethodsParticipants were asked open-ended questions to collect qualitative data. Data were analysed using content analysis by MaxQDA. ResultsData were analysed, and four main themes were determined. These main themes consisted of 16 sub-themes, and included midwifery department students' positive and negative opinions about the current episiotomy education and their expectations in cases where the education is carried out using virtual education environments. ConclusionsAlthough the current episiotomy education has positive aspects, such as suturing ability, it does not give a sense of reality, is not repetitive, and has many negative aspects, such as cost. It was determined that in virtual reality episiotomy education environments, students' expectations are similar to the real birth environment, and they have expectations of simulating risky situations because they think it will be more useful.

Shared decision-making in a medicalized birth environment: mixed-methods exploratory study, Cyprus

Abstract Background Maternity care practices are not always supportive of participation in decision-making; a fundamental pillar of the WHO Respectful Maternity Care framework. With the highest caesarean section (C/S) rate in the EU (>60%), high episiotomy rates (70.9%) etc, the medicalised birth environment in Cyprus raises questions about Informed Choice. Methods Following focus groups (N = 12) with pregnant women and new mums (N = 62), an online survey was shared via the Baby Buddy Cyprus webapp. Women responded to the Maternal Autonomy in Decision-Making (MADM) scale along a battery of scales, including perceived efficacy in patient-provider interaction (PEPPI) and Kim Alliance Scale (KAS). Results Based on MADM classification, 54.3% of 387 participants (64% primiparas, 42% C/S, 80% private sector) were classified as having high autonomy, while one in five were classified as low or very low. There were lower scores among primiparous women (p = 0.02) and higher among those receiving care in the private sector (p < 0.001). Perceived efficacy in interaction was related to educational attainment (p-value for trend=0.02). In regression models, KAS (b coeff= 1.25 95%CI 1.06, .1.45; p < 0.001) and PEPPI (b coeff = 0.38 95%CI 0.24, 0.52; p < 0.001) were independently associated with MADM after adjusting for socio-demographic and pregnancy characteristics. Consistently, having a “confident voice” in an ‘unsupportive system’ where the ‘art of communication’ is often left to the women themselves emerged as themes from the qualitative study. Conclusions Participation in decision-making among pregnant women in Cyprus is problematic. Given that reduction of C/S, most classified as elective by maternal request, was identified as national Public Health priority, further research is necessary. Continuous professional training along with population-level interventions to promote self-agency may be needed, especially since childbirth rights were further compromised during the COVID-19 pandemic. Key messages • Against physician dominance in communication, birthing women in Cyprus do not rate participation in decision-making favourably. • Further research is needed around Informed Choice, including educational and population-level interventions targeted at healthcare providers as well as women.

Contact with caregivers is associated with composition of the infant gastrointestinal microbiome in the first 6 months of life.

Little is known about how physical contact at birth and early caregiving environments influence the colonization of the infant gastrointestinal microbiome. We investigated how infant contact with caregivers at birth and within the first 2 weeks of life relates to the composition of the gastrointestinal microbiome in a sample of U.S. infants (n = 60). Skin-to-skin and physical contact with caregivers at birth and early caregiving environments were surveyed at 2 weeks postpartum. Stool samples were collected from infants at 2 weeks, 2, 6, and 12 months of age and underwent 16S rRNA sequencing as a proxy for the gastrointestinal microbiome. Associations between early caregiving environments and alpha and beta diversity, and differential abundance of bacteria at the genus level were assessed using PERMANOVA, and negative binomial mixed models in DEseq2. Time in physical contact with caregivers explained 10% of variation in beta diversity at 2 weeks' age. The number of caregivers in the first few weeks of life explained 9% of variation in beta diversity at 2 weeks and the number of individuals in physical contact at birth explained 11% of variation in beta diversity at 6 months. Skin-to-skin contact on the day of birth was positively associated with the abundance of eight genera. Infants held for by more individuals had greater abundance of eight genera. Results reveal a potential mechanism (skin-to-skin and physical contact) by which caregivers influence the infant gastrointestinal microbiome. Our findings contribute to work exploring the social transmission of microbes.

Normal birth rates before and after the merging of mixed-risk and low-risk maternity wards in Iceland: A retrospective cohort study on the impact of inter-professional preventative measures.

In 2014, the National University Hospital of Iceland (NUHI) merged a mixed-risk birth unit and a midwifery-led low-risk unit into one mixed-risk unit. Interprofessional preventative and mitigating measures were implemented since there was a known threat of cultural contamination between mixed-risk and low-risk birth environments. The aim of the study was to assess whether the NUHI's goal of protecting the rates of birth without intervention had been achieved and to support further development of labor services. A retrospective cohort study of all women who had singleton births at NUHI birth units in two 2-year periods, 2012-2013 and 2015-2016. The primary outcome variables, birth without intervention, with or without artificial rupture of membranes (AROM), were adjusted for confounding variables using logistic regression analysis. Secondary outcome variables (individual interventions and maternal and neonatal complications) were analyzed using descriptive statistics, t test, and Chi-square test. The rate of births without interventions, both with and without AROM, increased significantly after the unit merger and accompanying preventative measures. The rates of AROM, oxytocin augmentation, episiotomies, and epidural analgesia decreased significantly. The rate of induction increased significantly. There were no significant differences in maternal or neonatal complication rates. Interprofessional preventative measures, implemented alongside a mixed-risk and low-risk birth unit merger, can increase rates of births without interventions in a mixed-risk hospital setting. However, it is necessary to maintain awareness of the possible effects of a mixed-risk birth environment on the use of childbirth interventions and examine the long-term effects of preventative measures.

The management framework of upright position in the second stage of labour: A qualitative study

BackgroundUpright positions, as a non-pharmacological, have been well documented in multiple studies to promote normal labor, facilitate favourable birth outcomes and positive childbirth experience. Yet, the application status of upright positions in China, and even globally, is unfavourable. Thus, we have developed the Program for Upright Positions in the Second Stage of Labor (UPSSL program) for the widespread application of upright positions. While there is limited research evidence on the areas of improvement and corresponding strategies for embedding the evidence into midwifery practice. ObjectivesTo explore perspectives of health care providers on improvement areas of upright positions in the second stage of labor, and to identify corresponding strategies in order to develop a management framework for successful implementation of upright positions. MethodsA qualitative descriptive design with semi-structured interviews was conducted in the study. The participants involving 13 midwives, six obstetricians and six department managers were selected from three hospitals in Beijing, China. ATLAS.TI 8 software was utilized to manage, identify the transcript data, and the thematic analysis method guided the data analysis. ResultsA management framework of upright positions in the second stage of labor was developed based on our study, which included five improvement areas : (1) promoting the renewal of midwifery notions and the professional training;(2) strengthening maternal health education based on the "trinity" approach; (3) promoting multidisciplinary cooperation and refining the labor procedures in upright positions; (4) optimizing midwifery human resource allocation and formulating incentive policies; (5) encouraging partner involvement and improving the birth environment. ConclusionsThe study findings could provide a comprehensive view to promote UPSSL Program to be utilized in practice. Our study also provided a way for midwives, obstetricians, and other healthcare providers to work together to facilitate high quality maternal care. Implications for practiceOur findings will be useful for nursing managers to carry out the UPSSL program through several strategies, such as strengthening the professional training for assisting labor in the upright positions, reallocating midwifery human resources, and developing the childbirth education on the upright positions.

The dynamical evolution of protoplanetary discs and planets in dense star clusters

ABSTRACT Most stars are born in dense stellar environments, where the formation and early evolution of planetary systems may be significantly perturbed by encounters with neighbouring stars. To investigate the fate of circumstellar gas discs and planets around young stars dense stellar environments, we numerically evolve star–disc–planet systems. We use the N-body codes NBODY6++ GPU and SnIPES for the dynamical evolution of the stellar population, and the SPH-based code GaSPH for the dynamical evolution of protoplanetary discs. The secular evolution of a planetary system in a cluster differs from that of a field star. Most stellar encounters are tidal, adiabatic, and nearly-parabolic. The parameters that characterize the impact of an encounter include the orientation of the protoplanetary disc and planet relative to the orbit of the encountering star, and the orbital phase, and the semimajor axis of the planet. We investigate this dependence for close encounters (rp/a ≤ 100, where rp is the periastron distance of the encountering star and a is the semimajor axis of the planet). We also investigate distant perturbers (rp/a ≫ 100), which have a moderate effect on the dynamical evolution of the planet and the protoplanetary disc. We find that the evolution of protoplanetary discs in star clusters differs significantly from that of isolated systems. When interpreting the outcome of the planet formation process, it is thus important to consider their birth environments.

PSF-based Analysis for Detecting Unresolved Wide Binaries

Wide binaries play a crucial role in analyzing the birth environment of stars and the dynamical evolution of clusters. When wide binaries are located at greater distances, their companions may overlap in the observed images, becoming indistinguishable and resulting in unresolved wide binaries, which are difficult to detect using traditional methods. Utilizing deep learning, we present a method to identify unresolved wide binaries by analyzing the point-spread function (PSF) morphology of telescopes. Our trained model demonstrates exceptional performance in differentiating between single stars and unresolved binaries with separations ranging from 0.1 to 2 physical pixels, where the PSF FWHM is ∼2 pixels, achieving an accuracy of 97.2% for simulated data from the Chinese Space Station Telescope. We subsequently tested our method on photometric data of NGC 6121 observed by the Hubble Space Telescope. The trained model attained an accuracy of 96.5% and identified 18 wide binary candidates with separations between 7 and 140 au. The majority of these wide binary candidates are situated outside the core radius of NGC 6121, suggesting that they are likely first-generation stars, which is in general agreement with the results of Monte Carlo simulations. Our PSF-based method shows great promise in detecting unresolved wide binaries and is well suited for observations from space-based telescopes with stable PSF. In the future, we aim to apply our PSF-based method to next-generation surveys such as the China Space Station Optical Survey, where a larger-field-of-view telescope will be capable of identifying a greater number of such wide binaries.

Birth environment interventions and outcomes: A scoping review.

The physical environments in which women give birth can contribute positively to meeting both physiologic and psychosocial needs during labor. Most studies on the labor and delivery processes have focused on mitigating pain and providing psychological support. Fewer have explored the influence of the physical birth environment. In this study, we performed a scoping review to compile and examine qualitative and quantitative studies related to the characteristics of physical birth environments and their effects on labor outcomes. We searched the PubMed, CINHAL, Cochrane, Web of Science, and MEDLINE databases from inception to May 2022. A total of 13 studies met the criteria for inclusion in our review. Two reviewers screened the titles and full-text articles and extracted data from the included studies. We used summary statistics and narrative summaries to describe the study characteristics, intervention implementation guidelines, intervention selection and tailoring rationale, and intervention effects. In previous research, several elements of birth environments have been shown to provide physical and psychological support to birthing people and to improve outcomes related to the experience of care and pain management. We identified five main themes in the included studies: (1) "hominess;" (2) whether spaces are comfortable for activity; (3) demedicalization of the birth environment; (4) accommodations for birth partners; and (5) providing women with a sense of control over their birth environment. Birth environments should be designed to promote positive birthing experiences, both physiologically and psychologically. Facilities and those who manage them can improve the experiences and outcomes of service users by modifying or designing spaces that are "homey," comfortable for activity, demedicalized, and include natural elements. In addition, policies that allow the birthing person to control her own environment are key to promoting positive outcomes and satisfaction with the birth experience.

Breastfeeding and the major fermentation metabolite lactate determine occurrence of Peptostreptococcaceae in infant feces

ABSTRACT Previous studies indicated an intrinsic relationship between infant diet, intestinal microbiota composition and fermentation activity with a strong focus on the role of breastfeeding on microbiota composition. Yet, microbially formed short-chain fatty acids acetate, propionate and butyrate and other fermentation metabolites such as lactate not only act as substrate for bacterial cross-feeding and as mediators in microbe–host interactions but also confer antimicrobial activity, which has received considerably less attention in the past research. It was the aim of this study to investigate the nutritional–microbial interactions that contribute to the development of infant gut microbiota with a focus on human milk oligosaccharide (HMO) fermentation. Infant fecal microbiota composition, fermentation metabolites and milk composition were analyzed from 69 mother-infant pairs of the Swiss birth cohort Childhood AlleRgy nutrition and Environment (CARE) at three time points depending on breastfeeding status defined at the age of 4 months, using quantitative microbiota profiling, HPLC-RI and 1H-NMR. We conducted in vitro fermentations in the presence of HMO fermentation metabolites and determined the antimicrobial activity of lactate and acetate against major Clostridiaceae and Peptostreptococcaceae representatives. Our data show that fucosyllactose represented 90% of the HMOs present in breast milk at 1- and 3-months post-partum with fecal accumulation of fucose, 1,2-propanediol and lactate indicating fermentation of HMOs that is likely driven by Bifidobacterium. Concurrently, there was a significantly lower absolute abundance of Peptostreptococcaceae in feces of exclusively breastfed infants at 3 months. In vitro, lactate inhibited strains of Peptostreptococcaceae. Taken together, this study not only identified breastfeeding dependent fecal microbiota and metabolite profiles but suggests that HMO-derived fermentation metabolites might exert an inhibitory effect against selected gut microbes.

Exploring the Role of Birth Environment on Italian Mothers' Emotional Experience during Childbirth.

The physical environment is one of the factors that affect mother's experience of childbirth and psychological health. A woman's childbirth experience has been found to influence not only the mother's own health and future births but also the well-being of her child and family. The present study's objective was to investigate mothers' perceptions of spatial-physical humanization, affective quality of place, and emotions during childbirth. To achieve this goal, the first part of our work was dedicated to selecting two birth environments (hospital and birth center) with different degrees of humanization. The methods include observations and field survey which mainly concerned the environmental quality of the spaces and the layout of the birth unit, and self-report questionnaire about perceived environment, affective quality attributed to place, and delivery experience. Participants are 66 low-risk women, choosing hospital or birth center. The findings indicate an enhanced perception of both the spatial-physical aspects and the social and functional aspects of the care unit among mothers who give birth at the birth center. These same mothers also report a more positive perception of the childbirth experience. In conclusion, this study contributes to the understanding of the role of birth environments in shaping mothers' emotional experiences during childbirth.

Radial distribution of distant trans-Neptunian objects points to Sun’s formation in a stellar cluster

The Scattered Disk Objects (SDOs) are a population of trans-Neptunian bodies with semimajor axes 50<a≲1000 au and perihelion distances q≳30 au. The detached SDOs with orbits beyond the reach of Neptune (roughly q>35 au) are of special interest here as an important constraint on the early evolution of the outer Solar System. The semimajor axis profile of detached SDOs at 50–500 au, as characterized from the Dark Energy Survey (DES), is radially extended, but previous dynamical models of Neptune’s early migration produce a relatively compact profile. This problem is most likely related to Sun’s birth environment in a stellar cluster. We perform new dynamical simulations that account for cluster effects and show that the orbital distribution of SDOs can be explained if a particularly close stellar encounter occurred early on (e.g., M dwarf with the mass ≃0.2M⊙ approaching the Sun at ≃200 au). For such an encounter to happen with a reasonably high probability the Sun must have formed in a stellar cluster with ηT≳104 Myr pc−3, where η is the stellar number density and T is the Sun’s residence time in the cluster.

Exploring mothers’ experiences of perinatal care in Cyprus: Babies Born Better survey

IntroductionA positive perinatal experience facilitates a smooth transition to motherhood and enhances the development of a strong bond between mother and newborn, contributing to maternal and societal wellbeing. Given the medicalization of childbirth in Cyprus, the examination of mothers’ experiences of perinatal care becomes imperative.AimTo investigate mothers’ experiences of care during the perinatal period and to identify factors related to the provision of maternal care that contribute to the interpretation of these experiences.MethodsThe study draws on data from the European survey “Babies Born Better”, an online survey utilizing a mixed-methods approach to explore women’s experiences of maternity care across Europe. The study population were women who had given birth in Cyprus over a 5-year period (2013–2018). Quantitative data were analyzed using SPSS v22, while qualitative data were analyzed through inductive content analysis.FindingsA total of 360 mothers participated in the study. In rating their overall experience, 24.2% stated that they had a “bad experience”, 11.1% a “good experience”,13.9% a “very good experience”, and 13,3% a “very bad experience”. The top three sub-factors of the overall experience which received positive evaluation were “Relationship with health care professionals” (33.6%), “Birth environment and care” (11.4%), and “Breastfeeding guidance” (10.8%). The qualitative analysis yielded five themes: “Relationship with health care professionals”, “Breastfeeding establishment”, “Childbirth rights”, “Birth environment and services” and “Choice of mode of birth”.ConclusionMothers in Cyprus wish to have respectful maternity care. They need maternity health care professionals to respect their dignity and ask for evidence-based information with shared decision making. Mothers in Cyprus expect to have their childbirth rights safeguarded, to have better support from HCP, and to receive humanized care. The perinatal care provided in Cyprus needs significant improvements based on mothers’ needs and expectations.

Application of the Childbirth Supporter Study to Advance the Birth Unit Design Spatial Evaluation Tool.

Translational research to advance design criteria and apply the Childbirth Supporter Study (CSS) findings to practice. The physical design of birth environments has not undergone substantial improvements in layout or ambiance since the initial move to hospitals. Cooperative, continuously present childbirth supporters are beneficial and are an expectation for most modern birth practices, yet the built environment does not offer support for the supporter. To advance design criteria, we use a comparative case study approach to create translational findings. Specifically, CSS findings were used as indicators to advance the Birth Unit Design Spatial Evaluation Tool (BUDSET) design characteristics in pursuit of better support for childbirth supporters in the built hospital birth environment. This comparative case study provides eight new BUDSET design domain suggestions to benefit the supporter-woman dyad, and subsequently the baby and care providers. Research-informed design imperatives are needed to guide the inclusion of childbirth supporters as both a supporter and as an individual in the birth space. Increased understanding of relationships between specific design features and childbirth supporters' experiences and reactions are provided. Suggestions to enhance the applicability of the BUDSET for birth unit design facility development are made, specifically ones that will better accommodate childbirth supporters.

A mixed-design study on the development of birth unit assessment scale

IntroductionThis is a mixed design study planned to determine the views of women, midwives, and physicians about the ideal birth unit and to develop a to develop a valid and reliable measurement tool for postpartum women's evaluation of the effect of birth units in terms of physical, emotional, and social aspects on their satisfaction with the birth environment. MethodsThe exploratory sequential design, which is accepted as a mixed design, was used in the study. In the qualitative phase of the study, a content analysis was conducted by interviewing a total of 20 participants including 5 pregnant women, 5 postpartum women, 5 midwives and 5 obstetricians. In the quantitative phase, the Draft Birth Unit Satisfaction Assessment scale, which was developed in line with the data obtained as a result of the qualitative study, a literature review, and expert opinions, was used to evaluate postpartum women's (n = 435) satisfaction with the birth environment. Content validity, exploratory factor analysis, and confirmatory factor analysis were used for the validity analyses of the scale, and item analysis, internal consistency, and time-dependent invariance were evaluated for reliability. ResultsIn the qualitative phase of the study, the themes were grouped under 5 categories (physical features of the hospital, features of the birth room, privacy, aesthetics and support) according to the qualitative data on the factors that showed participants' views on the ideal birth unit. In the quantitative stage, the Birth Unit Satisfaction Assessment Scale, which consisted of 30 items and 5 sub-dimensions (communication and care, physical characteristics of the birth room, comfort, opportunities supporting birth, and decoration and aesthetics), was developed. DiscussionIn conclusion, it was determined that the scale developed in this study was a valid and reliable measurement tool that could be used to evaluate postpartum women's satisfaction with the birth environment.

Insights on the Sun Birth Environment in the Context of Star Cluster Formation in Hub–Filament Systems

Cylindrical molecular filaments are observed to be the main sites of Sunlike star formation, while massive stars form in dense hubs at the junction of multiple filaments. The role of hub–filament configurations has not been discussed yet in relation to the birth environment of the solar system and to infer the origin of isotopic ratios of short-lived radionuclides (SLR, such as 26Al) of calcium–aluminum-rich inclusions (CAIs) observed in meteorites. In this work, we present simple analytical estimates of the impact of stellar feedback on the young solar system forming along a filament of a hub–filament system. We find that the host filament can shield the young solar system from stellar feedback, both during the formation and evolution of stars (stellar outflow, wind, and radiation) and at the end of their lives (supernovae). We show that a young solar system formed along a dense filament can be enriched with supernova ejecta (e.g., 26Al) during the formation timescale of CAIs. We also propose that the streamers recently observed around protostars may be channeling the SLR-rich material onto the young solar system. We conclude that considering hub–filament configurations as the birth environment of the Sun is important when deriving theoretical models explaining the observed properties of the solar system.

ALMA ACA study of the H2S/OCS ratio in low-mass protostars

Context. The identification of the main sulfur reservoir on its way from the diffuse interstellar medium to the cold dense star-forming cores and, ultimately, to protostars is a long-standing problem. Despite sulfur’s astrochemical relevance, the abundance of S-bearing molecules in dense cores and regions around protostars is still insufficiently constrained. Aims. The goal of this investigation is to derive the gas-phase H2S/OCS ratio for several low-mass protostars, which could provide crucial information about the physical and chemical conditions in the birth cloud of Sun-like stars. This may also shed new light onto the main sulfur reservoir in low-mass star-forming systems. Methods. Using Atacama Large Millimeter/submillimeter Array (ALMA) Atacama Compact Array (ACA) Band 6 observations, we searched for H2S, OCS, and their isotopologs in ten Class 0/I protostars with different source properties such as age, mass, and environmental conditions. The sample contains IRAS 16293-2422 A, IRAS 16293-2422 B, NGC 1333-IRAS 4A, RCrA IRS7B, Per-B1-c, BHR71-IRS1, Per-emb-25, NGC 1333-IRAS4B, Ser-SMM3, and TMC1. A local thermal equilibrium (LTE) model is used to fit synthetic spectra to the detected lines and to derive the column densities based solely on optically thin lines. Results. The H2S and OCS column densities span four orders of magnitude across the sample. The H2S/OCS ratio is found to be in the range from 0.2 to above 9.7. IRAS 16293-2422 A and Ser-SMM3 have the lowest ratio, while BHR71-IRS1 has the highest. Only the H2S/OCS ratio of BHR71-IRS1 is in agreement with the ratio in comet 67P/Churyumov–Gerasimenko within the uncertainties. Conclusions. The determined gas-phase H2S/OCS ratios can be below the upper limits on the solid-state ratios by as much as one order of magnitude. The H2S/OCS ratio depends in great measure on the environment of the birth cloud, such as UV-irradiation and heating received prior to the formation of a protostar. The highly isolated birth environment (a Bok globule) of BHR71-IRS1 is hypothesized as the reason for its high gaseous H2S/OCS ratio that is due to lower rates of photoreactions and more efficient hydrogenation reactions under such dark, cold conditions. The gaseous inventory of S-bearing molecules in BHR71-IRS1 appears to be the most similar to that of interstellar ices.

Effect of alternatively designed hospital birthing rooms on the rate of vaginal births: Multicentre randomised controlled trial Be-Up

BackgroundThere is limited research into the effects of the birth environment on birth outcomes. AimTo investigate the effect of a hospital birthing room designed to encourage mobility, self-determination and uptake of upright maternal positions in labour on the rate of vaginal births. MethodsThe multicentre randomised controlled trial Be-Up, conducted from April 2018 to May 2021 in 22 hospitals in Germany, included 3719 pregnant women with a singleton pregnancy in cephalic position at term. In the intervention birthing room, the bed was removed or covered in a corner of the room and materials were provided to promote upright maternal positions, physical mobility and self-determination. No changes were made in the control birthing room.The primary outcome was probability of vaginal births; secondary outcomes were episiotomy, perineal tears degree 3 and 4, epidural anaesthesia, “critical outcome of newborns at term”, and maternal self-determination (LAS). Analysis: intention-to-treat. FindingsThe rate of vaginal births was 89.1 % (95 % CI 87.5–90.4%; n = 1836) in the intervention group and 88.5 % (95 % CI 87.0–89.9 %; n = 1863) in the control group. The risk difference in the probability of vaginal birth was + 0.54 % (95 % CI − 1.49 % to 2.57 %), the odds ratio was 1.06 (95 % CI 0.86–1.30). Neither the secondary endpoints nor serious adverse events showed significant differences. Regardless of group assignment, there was a significant association between upright maternal body position and maternal self-determination. ConclusionThe increased vaginal birth rates in both comparison groups can be explained by the high motivation of the women and the staff.