bluuebunny/crossref_metadata_2025_split huggingface dataset:
Capacity‐constrained entrepreneurs and their product portfolio size: The response to a platform design change on a Chinese sharing economy platform
Authors: Tae C. Jennifer , Luo Xueming , Lin Zhijie 
Published: July 2020

AbstractResearch summaryHow do entrepreneurs on a sharing economy platform (SEP) with a limit to aggregate output (capacity constraints) respond to a platform design change emphasizing buyer feedback? Not all supply‐side complementors can diversify or scale their offerings. Focusing on those who can change the former, but not the latter, we examine how entrepreneurs change their product portfolio size after the platform design changed to emphasize buyer feedback. We found that their product portfolio size decreased following the change, and more so for those with more positive feedback. While the sales increased for entrepreneurs after the change, buyer feedback deteriorated. Our results show how SEPs in emerging economies can foster entrepreneurship and elucidate the importance of nonscale‐free resources of supply‐side entrepreneurs to better understand platform dynamics.Managerial summaryDo sellers change the number of products on offer when the app owner rewards sellers with high user ratings? While research has examined how sellers adjust the number of products to get high ratings, little attention has been paid to sellers with capacity constraints. This is problematic, as sellers on sharing economy apps often have a limit on the total quantity of products they can produce. Using data from a Chinese home cooked meal selling app, we show that sellers decreased the number of products they sell when the app owner began to reward high user ratings. The decrease was more pronounced for sellers with higher ratings. As a result, sales revenue increased, but user ratings decreased. Implications for practitioners and policymakers are discussed within.
Trifunctional Single‐Atomic Ru Sites Enable Efficient Overall Water Splitting and Oxygen Reduction in Acidic Media
Authors: Peng Xianyun , Zhao Shunzheng , Mi Yuying , Han Lili , Liu Xijun , Qi Defeng , Sun Jiaqiang , Liu Yifan , Bao Haihong , Zhuo Longchao , Xin Huolin L. , Luo Jun , Sun Xiaoming 
Published: July 2020

AbstractDevelopment of cost‐effective, active trifunctional catalysts for acidic oxygen reduction (ORR) as well as hydrogen and oxygen evolution reactions (HER and OER, respectively) is highly desirable, albeit challenging. Herein, single‐atomic Ru sites anchored onto Ti3C2Tx MXene nanosheets are first reported to serve as trifunctional electrocatalysts for simultaneously catalyzing acidic HER, OER, and ORR. A half‐wave potential of 0.80 V for ORR and small overpotentials of 290 and 70 mV for OER and HER, respectively, at 10 mA cm−2 are achieved. Hence, a low cell voltage of 1.56 V is required for the acidic overall water splitting. The maximum power density of an H2–O2 fuel cell using the as‐prepared catalyst can reach as high as 941 mW cm−2. Theoretical calculations reveal that isolated Ru–O2 sites can effectively optimize the adsorption of reactants/intermediates and lower the energy barriers for the potential‐determining steps, thereby accelerating the HER, ORR, and OER kinetics.
Understanding the complexity of health
Authors: Rouse William B. 
Published: July 2020

AbstractThe complexity of health cannot be adequately explained with a representation that only captures one level of abstraction of the ecosystem. Multiple levels of abstraction are needed to comprehend the full range of forces that affect the health of a population. These levels are outlined and run the gamut from cells to society, ranging from aberrations of immune system signalling to society's values and norms. Computational modelling of this multilevel system can enable both understanding and managing the complexity of health. This is illustrated in contexts that include Washington, DC, and New York City.
Classroom Interaction in CLIL Programs: Offering Opportunities or Fostering Inequalities?
Authors: Llinares Ana , Evnitskaya Natalia 
Published: July 2020

AbstractThis study investigated potential inequalities in a bilingual education program where secondary school students are streamed into two strands with different degrees of exposure to the target language based on their proficiency: high exposure (HE) and low exposure (LE). Drawing on classroom registers (Christie, 2005), appraisal theory (Martin & White, 2005), and sociocultural perspectives on classroom interaction (Gibbons, 2006; Lemke, 1989; Mortimer & Scott, 2003), researchers analysed interactional practices by teachers teaching the same content in both groups. Results show no major differences in distribution of classroom registers and teachers’ general pedagogical purposes across groups. Analysis of students’ language use across registers corroborates previous studies showing that translanguaging in content and language integrated learning is more common when the focus is on classroom management issues (e.g., Moore & Nikula, 2016). The most striking results relate to differences in use of pedagogical purposes and evaluative language. These differences entail more interactional engagement in higher order thinking skills by HE students and use of a wider variety of language resources in the second language (L2) to express these meanings, compared to LE students. This indicates that the division into strands in bilingual programs may lead to different perceptions of students’ academic capacities beyond L2 proficiency and reinforcement of social differences and inequality in bilingual programs.
A study on UV‐protection property of poly(vinyl alcohol)‐montmorillonite composite nanofibers
Authors: Elhami Mozhgan , Habibi Sima 
Published: July 2020

AbstractThe aim of this research is to investigate the possibility of barrier effect of poly(vinyl alcohol) (PVA)/montmorillonite (MMT) nanofiber, against the UV radiation in different electrospinning situations. For this purpose, nanofibers with different weight ratio of PVA and nanoclay (MMT) were electrospun under different circumstances, and the amount of protect that is created by the nanofiber web against UV radiation by examining the rate of degradation of methylene blue dye that was protected by the same web was estimated. The UV‐vis spectrometry was used for the analysis of methylene blue color. In order to investigate the morphology and miscibility of PVA‐MMT composite nanofiber, X‐ray diffraction, scanning election microscope, and Fourier transform infrared spectrometer have been used. Thermal gravimetric analysis is used to investigate and explore how nanofibers behave against heat.
Is adipose tissue suitable for detection of (synthetic) cannabinoids? A comparative study analyzing antemortem and postmortem specimens following pulmonary administration of JWH-210, RCS-4, as well as ∆9-tetrahydrocannabinol to pigs
Authors: Schaefer Nadine , Nordmeier Frederike , Kröll Ann-Katrin , Körbel Christina , Laschke Matthias W. , Menger Michael D. , Maurer Hans H. , Meyer Markus R. , Schmidt Peter H. 
Published: July 2020

AbstractExamining fatal poisonings, chronic exposure may be reflected by the concentration in tissues known for long-term storage of drugs. Δ9-tetrahydrocannabinol (THC) persists in adipose tissue (AT), but sparse data on synthetic cannabinoids (SC) are available. Thus, a controlled pig study evaluating antemortem (AM) disposition and postmortem (PM) concentration changes of the SC 4-ethylnaphthalene-1-yl-(1-pentylindole-3-yl)methanone (JWH-210) and 2-(4-methoxyphenyl)-1-(1-pentyl-indole-3-yl)methanone (RCS-4) as well as THC in AT was performed. The drugs were administered pulmonarily (200 µg/kg body weight) to twelve pigs. Subcutaneous (s.c.) AT specimens were collected after 15 and 30 min and then hourly up to 8 h. At the end, pigs were sacrificed and s.c., perirenal, and dorsal AT specimens were collected. The carcasses were stored at room temperature (RT; n = 6) or 4 °C (n = 6) and specimens were collected after 24, 48, and 72 h. After homogenization in acetonitrile and standard addition, LC–MS/MS was performed. Maximum concentrations were reached 0.5–2 h after administration amounting to 21 ± 13 ng/g (JWH-210), 24 ± 13 ng/g (RCS-4), and 22 ± 20 ng/g (THC) and stayed at a plateau level. Regarding the metabolites, very low concentrations of N-hydroxypentyl-RCS-4 (HO-RCS-4) were detected from 0.5 to 8 h. PM concentrations of parent compounds did not change significantly (p > 0.05) over time under both storage conditions. Concentrations of HO-RCS-4 significantly (p < 0.05) increased in perirenal AT during storage at RT. These results suggest a rapid distribution and persistence in s.c. AT. Furthermore, AT might be resistant to PM redistribution of parent compounds. However, significant PM increases of metabolite concentrations might be considered in perirenal AT.
Full Family of Flattening Solitary Waves for the Critical Generalized KdV Equation
Authors: Martel Yvan , Pilod Didier 
Published: July 2020

AbstractFor the critical generalized KdV equation $$\partial _t u + \partial _x (\partial _x^2 u + u^5)=0$$

∂
t

u
+

∂
x

(

∂
x
2

u
+

u
5

)

=
0

on $${\mathbb {R}}$$
R
, we construct a full family of flattening solitary wave solutions. Let Q be the unique even positive solution of $$Q''+Q^5=Q$$

Q

′
′

+

Q
5

=
Q

. For any $$\nu \in (0,\frac{1}{3})$$

ν
∈
(
0
,

1
3

)

, there exist global (for $$t\ge 0$$

t
≥
0

) solutions of the equation with the asymptotic behavior $$\begin{aligned} u(t,x)= t^{-\frac{\nu }{2}} Q\left( t^{-\nu } (x-x(t))\right) +w(t,x) \end{aligned}$$

u

(
t
,
x
)

=

t

-

ν
2

Q

t

-
ν

(
x
-
x

(
t
)

)

+
w

(
t
,
x
)

where, for some $$c>0$$

c
>
0

, $$\begin{aligned} x(t)\sim c t^{1-2\nu } \quad \text{ and }\quad \Vert w(t)\Vert _{H^1(x>\frac{1}{2} x(t))} \rightarrow 0\quad \text{ as } t\rightarrow +\infty . \end{aligned}$$

x

(
t
)

∼
c

t

1
-
2
ν

and

‖
w

(
t
)

‖

H
1

(
x
>

1
2

x

(
t
)

)

→
0

as

t
→
+
∞
.

Moreover, the initial data for such solutions can be taken arbitrarily close to a solitary wave in the energy space. The long-time flattening of the solitary wave is forced by a slowly decaying tail in the initial data. This result and its proof are inspired and complement recent blow-up results for the critical generalized KdV equation. This article is also motivated by previous constructions of exotic behaviors close to solitons for other nonlinear dispersive equations such as the energy-critical wave equation.
Access to Operative Intervention Reduces Mortality in Adult Burn Patients in a Resource‐Limited Setting in Sub‐Saharan Africa
Authors: Gallaher Jared R. , Banda Wone , Robinson Brittany , Purcell Laura N. , Charles Anthony 
Published: July 2020

AbstractIntroductionEarly excision and grafting remains the standard of care after burn injury. However, in a resource‐limited setting, operative capacity often limits patient access to surgical intervention. This study sought to describe access to excision and grafting for adult burn patients in a sub‐Saharan African burn unit and its relationship with burn‐associated mortality.
MethodsWe analyzed patients recorded in the Kamuzu Central Hospital Burn Registry in Lilongwe, Malawi from 2011–2019. We examined patient characteristics, interventions, and outcomes for adults aged ≥16 years. Modified Poisson regression modeling was used to identify risk factors for mortality.
ResultsFive hundred and seventy‐three patients were included. Median age was 30 years (IQR 23–40) with a male preponderance (63%). Median percent total body surface area burned (%TBSA) was 15% (IQR 8–26) and 68% of burns were caused by flame. 27% (n = 154) had burn excision with skin grafting, with a median time to operation of 18 days (IQR 9–38). When adjusted for age, %TBSA, and time to presentation, operative intervention conferred a survival benefit for patients with flame burns with a RR 0.16 (95% CI 0.06, 0.42).ConclusionsIn a resource‐limiting setting, access to the operating room is inadequate, and burn patients are not prioritized. While many scald burn patients may be managed with wound care alone, patients with flame burn require surgical intervention to improve clinical outcomes. Burn injury in this region continues to confer a high risk of mortality, and more investment in operative capacity is imperative.
Comparison of a coaxial versus non-coaxial liver biopsy technique in an oncological setting: diagnostic yield, complications and seeding risk
Authors: Fotiadis Nicos , De Paepe Katja N. , Bonne Lawrence , Khan Nasir , Riddell Angela , Turner Nicholas , Starling Naureen , Gerlinger Marco , Rao Sheela , Chau Ian , Cunningham David , Koh Dow-Mu 
Published: July 2020

Abstract
Objectives
Percutaneous liver biopsy (PLB) poses specific challenges in oncological patients such as bleeding and tumour seeding. This study’s aim was to compare a coaxial (C-PLB) and non-coaxial (NC-PLB) biopsy technique in terms of diagnostic yield, safety and seeding risk of image-guided PLB techniques in an oncological setting.

Methods
Local research committee approval was obtained for this single-site retrospective study. Patients who underwent a PLB between November 2011 and December 2017 were consecutively included. Medical records were reviewed to determine diagnostic yield and complications. Follow-up imaging was re-reviewed for seeding, defined as visible tumour deposits along the PLB track. Mann-Whitney U and chi-squared tests were performed to investigate differences between biopsy techniques in sample number, complications and seeding rate.

Results
In total, 741 patients (62 ± 13 years, 378 women) underwent 932 PLB (C-PLB 72.9% (679/932); NC-PLB 27.1% (253/932)). More tissue cores (p < 0.001) were obtained with C-PLB (median 4 cores; range 1–12) compared with NC-PLB (2 cores; range 1–4) and diagnostic yield was similar for both techniques (C-PLB 92.6% (629/679); NC-PLB 92.5% (234/253); p = 0.940). Complication rate (9.3%; 87/932) using C-PLB (8.2% (56/679)) was lower compared with NC-PLB (12.3% (31/253); p = 0.024). Major complications were uncommon (C-PLB 2.7% (18/679); NC-PLB 2.8% (7/253)); bleeding developed in 1.2% (11/932; C-PLB 1.2% (8/679); NC-PLB 1.2% (3/253)). Seeding was a rare event, occurring significantly less in C-PLB cases (C-PLB 1.3% (7/544); NC-PLB 3.1% (6/197); p = 0.021).

Conclusions
C-PLB allows for high diagnostic tissue yield with a lower complication and seeding rate than a NC-PLB and should be the preferred method in an oncological setting.

Key Points
• A coaxial percutaneous liver biopsy achieves a significant higher number of cores and fewer complications than a non-coaxial biopsy technique.
• The risk of tumour seeding is very low and is significantly lower using the coaxial biopsy technique.
• In this study, a larger number of cores (median = 4) could be safely acquired using the coaxial technique, providing sufficient material for advanced molecular analysis.
Großes Makulaforamen – immer eine schlechte Prognose?
Authors: Friedrich J. , Bleidißel N. , Klaas J. , Feucht N. , Nasseri A. , Lohmann C. P. , Maier M. 
Published: July 2020

ZusammenfassungHintergrundAlter, präoperativer Visus und Makulaforamengröße gelten als prognostische Marker für das postoperative Ergebnis bei Patienten mit durchgreifendem Makulaforamen (MF).Ziel der ArbeitUm den postoperativen Verlauf nach i‑ILM Peeling (inverted-Flap ILM-Peeling) mit konventionellem ILM-Peeling (k-ILM) zu vergleichen, wurde eine retrospektive Beobachtungsstudie durchgeführt. Patienten mit i‑ILM Peeling hatten dabei präoperativ ein statistisch signifikant größeres Makulaforamen.Material und MethodenEs wurden 45 konsekutive Patienten mit durchgreifendem Makulaforamen (MF) in 2 Gruppen (i-ILM vs. k‑ILM) eingeteilt und auf Unterschiede im postoperativen Visus (BCVA) und der Netzhautmorphologie hin untersucht. Die Integrität der äußeren Netzhautschichten, äußere limitierende Membran (ELM), ellipsoide Zone (EZ) und äußere Photorezeptoraußensegmente (OS), wurde postoperativ mittels SD-OCT (Spectral-Domain-OCT) analysiert.ErgebnisseDie präoperative Apertur in der i‑ILM Gruppe war signifikant größer (i-ILM = 408,4 µm, SD = 157,5 µm; k‑ILM = 287,4 µm, SD = 104,9 µm;p = 0,01). Der Ausgangsvisus sowie der postoperative Visus nach 1 Monat waren in der Gruppe mit k‑ILM-Peeling signifikant besser (p = 0,03 undp = 0,001). Der postoperative Visus nach mindestens 6 Monaten zeigte keinen signifikanten Unterschied zwischen den beiden Gruppen (p = 0,24). Die ELM zeigte als erste der äußeren Netzhautschichten eine Re-Integrität in beiden Gruppen.SchlussfolgerungMithilfe der i‑ILM-Peeling-Technik erschien es in dieser konsekutiven Serie möglich zu sein, für Patienten mit großem durchgreifendem MF ein ähnliches postoperatives Visusergebnis zur erreichen wie für mittels k‑ILM-Peeling-Technik operierte Patienten mit kleinerem durchgreifendem MF.
Are uterine natural killer and plasma cells in infertility patients associated with endometriosis, repeated implantation failure, or recurrent pregnancy loss?
Authors: Freitag Nadine , Pour Sarah J. , Fehm Tanja N. , Toth Bettina , Markert Udo R. , Weber Maja , Togawa Riku , Kruessel Jan-Steffen , Baston-Buest Dunja M. , Bielfeld Alexandra P. 
Published: July 2020

AbstractPurposeInfertility is a debilitating situation that millions of women around the world suffer from, but the causal relationship between infertility and endometriosis is still unclear. We hypothesize that the immune cell populations of uterine natural killer cells (uNK) and plasma cells (PC) which define chronic endometritis could differ in patients with or without endometriosis and therefore be the link to endometriosis-associated infertility.MethodsOur retrospective study includes 173 patients that underwent an endometrial scratching in the secretory phase of the menstrual cycle and subsequently immunohistochemical examination for uNK cells and PC. Sixty-seven patients were diagnosed with endometriosis, 106 served as the control cohort.ResultsThe risk for an elevated number of uNK cells in women with endometriosis is not increased as compared to the control group. Our findings suggest that patients with endometriosis are 1.3 times more likely to have chronic endometritis (CE) as compared to those without and that the treatment with doxycycline might increase pregnancy rates. Endometriosis and an increased number of uNK cells seem to be unrelated.ConclusionsIn contrast to the lately published connection between endometriosis, infertility and increased uNK cells, we could not find any evidence that patients with endometriosis are more prone to elevated uterine uNK cells. Counting of PC in endometrial biopsies might be a new approach in the search of biomarkers for the nonsurgical diagnosis of endometriosis since our findings suggest a connection.
Causes of nutrition deficit during immediate postoperative period after free flap surgery for cancer of the head and neck
Authors: Nurkkala Juho , Lahtinen Sanna , Kaakinen Timo , Vakkala Merja , Liisanantti Janne 
Published: July 2020

AbstractPurposeThe aim of the present of study was to examine nutrition deficit during the immediate postoperative in-hospital period following free flap surgery for cancer of the head and neck (HNC). Underfeeding and malnutrition are known to be associated with impaired short- and long-time recovery after major surgery.MethodsThis single-center retrospective cohort study included 218 HNC patients who underwent free flap surgery in Oulu University Hospital, Finland between the years 2008 and 2018. Nutrition delivery methods, the adequacy of nutrition and complication rates were evaluated during the first 10 postoperative days.ResultsA total of 131 (60.1%) patients reached nutritional adequacy of 60% of calculated individual demand during the follow-up period. According to multivariate analysis, nutrition inadequacy was associated with higher ideal body weight (OR 1.11 [1.04–1.20]), whereas adequate nutrition was associated with higher number of days with oral food intake (OR 0.79 [0.67–0.93]).ConclusionInadequate nutrition is common after HNC free flap surgery. The present results suggest that more adequate nutrition delivery might be obtained by the early initiation of oral food intake and close monitoring of nutrition support.
Insight-related beliefs and controllability appraisals contribute little to hallucinated voices: a transdiagnostic network analysis study
Authors: Pappa Elisavet , Peters Emmanuelle , Bell Vaughan 
Published: July 2020

AbstractHallucinated voices cause high levels of distress and disability. Current theories suggest that insight-related beliefs, about internal or external origin, perceived source location, and appraisals of controllability are important in mediating the impact of these experiences but previous findings have been mixed. We report two open code and open data network analytic studies of items in the Psychotic Symptoms Ratings Scale for auditory verbal hallucinations (PSYRATS-AH) in a large sample of patients with hallucinated voices to examine the network structure of items at (1) first assessment, and (2) differences over two consecutive assessments during a wait-list period. Networks were generated using least absolute shrinkage and selection operator (LASSO) and extended Bayesian information criterion (EBIC) with node predictability. In Study 1 (N = 386), we report that insight-related items made a negligible contribution to hallucinated voices and the controllability appraisal made at most a modest contribution. Items relating to distress and negative content were the most central and most predicted by the wider network. In Study 2 (N = 204), we tested the longitudinal stability of the structure of hallucinated voices over a period of several months, finding a small change in total hallucination score and global strength but no clear evidence for an alteration in the structural relationship. The insight-related and controllability items remained as least influential over time. Insight-related beliefs and controllability appraisals may contribute less than previously thought to distressing hallucinated voices although we do not discount that other appraisals may remain important.
A mummified human corpse and associated insects of forensic importance in indoor conditions
Authors: Kadej Marcin , Szleszkowski Łukasz , Thannhäuser Agata , Jurek Tomasz 
Published: July 2020

AbstractWe report, for the first time from Poland, the presence ofDermestes haemorrhoidalis(Coleoptera: Dermestidae) on a mummified human corpse found in a flat (Lower Silesia province, south-western Poland). Different life stages ofD. haemorrhoidaliswere gathered from the cadaver, and the signs of activity of these beetles (i.e. frass) were observed. On the basis of these facts, we concluded that the decedent, whose remains were discovered in the flat on 13 December 2018, died no later than the summer of 2018, with a strong probability that death occurred even earlier (2016 or 2017). A case history, autopsy findings, and entomological observations are provided. The presence of larvae of Dermestidae in the empty puparia of flies is reported for the first time. A list of the invertebrate species found in the corpse is provided, compared with available data, and briefly discussed.