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- 2019
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Tidskriftsartikel (refereegranskat)
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- Wakelam, V., et al.
(författare)
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A KINETIC DATABASE FOR ASTROCHEMISTRY (KIDA)
- 2012
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Ingår i: Astrophysical Journal Supplement Series. - : American Astronomical Society. - 0067-0049 .- 1538-4365. ; 199:1, s. 21-
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Tidskriftsartikel (refereegranskat)abstract
- We present a novel chemical database for gas-phase astrochemistry. Named the KInetic Database for Astrochemistry (KIDA), this database consists of gas-phase reactions with rate coefficients and uncertainties that will be vetted to the greatest extent possible. Submissions of measured and calculated rate coefficients are welcome, and will be studied by experts before inclusion into the database. Besides providing kinetic information for the interstellar medium, KIDA is planned to contain such data for planetary atmospheres and for circumstellar envelopes. Each year, a subset of the reactions in the database (kida.uva) will be provided as a network for the simulation of the chemistry of dense interstellar clouds with temperatures between 10 K and 300 K. We also provide a code, named Nahoon, to study the time-dependent gas-phase chemistry of zero-dimensional and one-dimensional interstellar sources.
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- Olson, Linus, et al.
(författare)
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Comparison of Three Hypothermic Target Temperatures for the Treatment of Hypoxic Ischemia : MRNA Level Responses of Eight Genes in the Piglet Brain
- 2013
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Ingår i: Translational Stroke Research. - : Springer Science and Business Media LLC. - 1868-4483 .- 1868-601X. ; 4:2, s. 248-257
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Tidskriftsartikel (refereegranskat)abstract
- Hypothermia can reduce neurodevelopmental disabilities in asphyxiated newborn infants. However, the optimal cooling temperature for neuroprotection is not well defined. We studied the effects of transient piglet brain hypoxic ischemia (HI) on transcriptional activity of eight genes and if mRNA level alterations could be counteracted by whole body cooling to 35, 33. 5 or 30 °C. BDNF mRNA was globally upregulated by the insult, and none of the cooling temperatures counteracted this change. In contrast, MANF mRNA was downregulated, and these changes were modestly counteracted in different brain regions by hypothermic treatment at 33. 5 °C, while 30 °C aggravated the MANF mRNA loss. MAP2 mRNA was markedly downregulated in all brain regions except striatum, and cooling to 33. 5 °C modestly counteract this downregulation in the cortex cerebri. There was a tendency for GFAP mRNA levels in core, but not mantle regions to be downregulated and for these changes to be modestly counteracted by cooling to 33. 5 or 35 °C. Cooling to 30 °C caused global GFAP mRNA decrease. HSP70 mRNA tended to become upregulated by HI and to be more pronounced in cortex and CA1 of hippocampus during cooling to 33. 5 °C. We conclude that HI causes alterations of mRNA levels of many genes in superficial and deep piglet brain areas. Some of these changes may be beneficial, others detrimental, and lowering body temperature partly counteracts some, but not all changes. There may be general differences between core and mantle regions, as well as between the different cooling temperatures for protection. Comparing the three studied temperatures, cooling to 33. 5 °C, appears to provide the best cooling temperature compromise.
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- Chandrasekaran, Sundaram, et al.
(författare)
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Advanced opportunities and insights on the influence of nitrogen incorporation on the physico-/electro-chemical properties of robust electrocatalysts for electrocatalytic energy conversion
- 2021
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Ingår i: Coordination chemistry reviews. - : Elsevier. - 0010-8545 .- 1873-3840. ; 449
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Forskningsöversikt (refereegranskat)abstract
- The use of a wide range of methods for incorporating nitrogen atoms on robust catalysts has given rise to fundamental advances in the field of energy conversion and storage. Recently, nitrogen incorporation has proven to be able to fine-tune the electron densities of exposed active sites to create high-performance electrocatalysts. The preservation of a strong interface between the local atomic coordination of nitrogen atoms on bare carbon, single metal atoms, transition metal oxides, metal chalcogenides, and MXenes during synthesis plays an important role in producing an efficient electrocatalysts. In addition, the ability of nitrogen atoms to bind with carbon or metal atoms can be influenced by processing conditions. In this regard, this review is the first comprehensive overview of the range of synthetic strategies to form nitrogen incorporated catalysts and assess their chemical, structural, physical electronic property modification and their influence on electrocatalytic ORR, OER, and HER performance. This review will describe how specific strategies have been utilized to realise effective electrocatalytic systems, including the energy conversion of nitrogen incorporated catalysts, structural coordination, and material optimization. Finally, the main challenges to be considered in future investigations in order to initiate new research efforts in this promising research area are discussed.
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- Lluch-Girbés, Enrique, et al.
(författare)
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Kinetic chain revisited : Consensus expert opinion on terminology, clinical reasoning, examination and treatment in people with shoulder pain
- 2023
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Ingår i: Journal of shoulder and elbow surgery. - : Elsevier BV. - 1058-2746 .- 1532-6500. ; 32:8, s. e415-e428
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: To determine the most appropriate terminology and issues related to clinical reasoning, examination and treatment of the kinetic chain (KC) in people with shoulder pain by an international experts panel.DESIGN: Delphi study METHODS: A three-round Delphi study that involved an international panel of experts with extensive clinical, teaching and research experience in the study topic was conducted. A search equation of terms related to KC in Web of Science and a manual search were used to find the experts. Participants were asked to rate items across five different domains (terminology, clinical reasoning, subjective examination, physical examination and treatment) using a 5-point Likert-type scale. An Aiken's Validity Index ≥ 0.7 was considered indicative of group consensus.RESULTS: Participation rate was 30.2% (n=16) while retention rate was high throughout the 3 rounds (100%, 93.8%, 100%). A total of 15 experts from different fields and countries completed the study. After the three rounds, consensus was reached on 102 items: 3 items were included in the "terminology" domain, 17 items in the "rationale and clinical reasoning" domain, 11 items in the "subjective examination" domain, 44 items in the "physical examination" domain and 27 items in the "treatment" domain. "Terminology" was the domain with the highest level of more agreement with two items achieving an Aiken's V of 0.93, whereas "physical examination" and "treatment" of the KC where the two areas with less consensus. Together with "terminology" items, one item from the "treatment" and two items from the "rationale and clinical reasoning" domains reached the highest level of agreement (v=0.93 and 0.92, respectively).CONCLUSION: This study defined a list of 102 items across five different domains (terminology, rationale and clinical reasoning, subjective examination, physical examination and treatment) regarding to KC in people with shoulder pain. The term KC was preferred and a definition for this concept agreed. Dysfunction of a segment in the chain (i.e., weak link) was agreed to result in altered performance or injury to distal segments. Experts considered important to assess and treat the KC in particular in throwing/overhead athletes and agreed that no one size fits all approach exist when implementing shoulder KC exercises within the rehabilitation process. Further research is now required to determine the validity of the identified items.
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- Mortazavi, A. N., et al.
(författare)
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Exploring failure modes of alumina scales on FeCrAl and FeNiCrAl alloys in a nitriding environment
- 2020
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Ingår i: Acta Materialia. - : Elsevier BV. - 1359-6454. ; 201, s. 131-146
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Tidskriftsartikel (refereegranskat)abstract
- Two high-temperature FeCrAl and FeNiCrAl alloys were exposed in a strongly nitriding environment at 900 °C and the morphology of nitridation was studied. Quasi-in-situ experiments revealed that nitridation started at specific surface sites directly related to the alloy microstructure where the alumina scale was permeable to nitrogen. FeCrAl alloy grains with (112) orientation formed outward-growing alumina scales and were susceptible to nitridation. Outward-growing scales and substrate nitridation was also observed at chromium carbide precipitates in the FeNiCrAl alloy. Both alloys suffered nitridation at reactive element-rich (Y and Zr) inclusions larger than a certain critical size. The latter type of attack is caused by cracks and pores in the scale. The findings open new avenues of research for developing the next generation of high temperature alloys with superior properties.
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