| 1. |
- Webber, K. B., et al.
(författare)
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Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate
- 2023
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Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 959:2
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Tidskriftsartikel (refereegranskat)abstract
- We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the alpha-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of similar to 11.2 M-circle dot. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.
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| 2. |
- Shoman, H., et al.
(författare)
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Gasless laparoscopy versus conventional laparoscopy and laparotomy: A systematic review on the safety and efficiency
- 2023
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Ingår i: Surgical Practice. - 1744-1625. ; 27:3, s. 171-186
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Forskningsöversikt (refereegranskat)abstract
- BackgroundGasless laparoscopy (GL) emerged to overcome the clinical and financial challenges of pneumoperitoneum and is often seen as a viable option for use in resource-limited settings as a means of saving costs and resources. This study aims to systematically review the evidence available on the safety and efficiency of GL compared with conventional laparoscopy (CL) and laparotomy. MethodsFollowing the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, Medline, Embase, Web of Science and Cochrane databases were searched. Variables of interest were determined a priori and Covidence software was used to screen studies for inclusion without demographic preference. The quality of studies was assessed using the Cochrane Risk Assessment tool. ResultsOf the 1080 studies screened, a total of 43 studies were included. Laparoscopic cholecystectomy was by far the most studied intervention in randomised studies. In these, the mean setup time for gasless and CL was 13.14 (95% CI -0.16 to 26.44) and 12.8 (95% CI -10.86 to 36.47) minutes, respectively. The mean duration of surgery for gasless and CL was 89.39 (95% CI 77.44 to 101.34) and 72.59 (95% CI 63.44 to 81.74) minutes, respectively, and the mean length of stay was 4.25 (95% CI 2.02 to 6.48) and 4.04 (95% CI 1.72 to 6.36) days, respectively. Most reported complications were haemorrhage and infection with no assessable statistical difference. ConclusionsAlthough GL seems to be a feasible approach for many general surgery interventions, the observed outcomes based on safety and efficiency are not sufficient to recommend GL as an alternative to CL or laparotomy. Larger randomised trials with a low risk of bias are warranted.
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