scholarly journals Adding insult to injury: Effects of chronic oxybenzone exposure and elevated temperature on two reef-building corals

2019 ◽  
Author(s):  
Tim Wijgerde ◽  
Mike van Ballegooijen ◽  
Reindert Nijland ◽  
Luna van der Loos ◽  
Christiaan Kwadijk ◽  
...  
Keyword(s):  
Global Warming ◽  
Elevated Temperature ◽  
Heat Wave ◽  
Effect Study ◽  
List Type ◽  
Stylophora Pistillata ◽  
Coral Microbiome ◽  
The Face ◽  
Acropora Tenuis ◽  
Coral Health

AbstractWe studied the effect of chronic oxybenzone exposure and elevated temperature on coral health. Microcolonies of Stylophora pistillata and Acropora tenuis were cultured in 20 flow-through aquaria, of which 10 were exposed to oxybenzone at a field-relevant concentration of ~0.06 μg L−1 at 26 °C. After two weeks, half of the corals experienced a heat wave culminating at 33 °C. All S. pistillata colonies survived the heat wave, although heat reduced growth and zooxanthellae density, irrespective of oxybenzone. A. tenuis survival was reduced to 0% at 32 °C, and oxybenzone accelerated mortality. Oxybenzone and heat significantly reduced photosynthetic yield in both species, causing a 5% and 22−33% decrease, respectively. In addition, combined oxybenzone and temperature stress altered the abundance of five bacterial families in the microbiome of S. pistillata. Our results suggest that oxybenzone adds insult to injury by further weakening corals in the face of global warming.Highlights➢Chronic effect study on corals combining oxybenzone and elevated temperature➢Oxybenzone affected photosystem II of coral photosymbionts and altered coral microbiome➢Temperature effects were stronger than oxybenzone effects➢Sensitivities were species-dependent➢Oxybenzone adds insult to injury by weakening corals in the face of global warming

Evidence for a shear mechanism for the precipitation of γ-zirconium hydride in zirconium

1978 ◽  
Vol 36 (1) ◽  
pp. 658-659
Author(s):  
G.J.C. Carpenter
Keyword(s):  
Elevated Temperature ◽  
Strain Field ◽  
Zirconium Hydride ◽  
Zirconium Atom ◽  
Atom Diffusion ◽  
Solvus Temperature ◽  
Hexagonal Close Packed ◽  
Partial Dislocations ◽  
The Face

In zirconium-hydrogen alloys, rapid cooling from an elevated temperature causes precipitation of the face-centred tetragonal (fct) phase, γZrH, in the form of needles, parallel to the close-packed <1120>zr directions (1). With low hydrogen concentrations, the hydride solvus is sufficiently low that zirconium atom diffusion cannot occur. For example, with 6 μg/g hydrogen, the solvus temperature is approximately 370 K (2), at which only the hydrogen diffuses readily. Shears are therefore necessary to produce the crystallographic transformation from hexagonal close-packed (hep) zirconium to fct hydride.The simplest mechanism for the transformation is the passage of Shockley partial dislocations having Burgers vectors (b) of the type 1/3<0110> on every second (0001)Zr plane. If the partial dislocations are in the form of loops with the same b, the crosssection of a hydride precipitate will be as shown in fig.1. A consequence of this type of transformation is that a cumulative shear, S, is produced that leads to a strain field in the surrounding zirconium matrix, as illustrated in fig.2a.

An Open Top Chamber for Forage Maize to Study the Effect of Elevated Temperature by Global Warming

2021 ◽  
Vol 41 (3) ◽  
pp. 183-188
Author(s):  
Chang-Woo Min ◽  
◽  
Inam Khan ◽  
Min-Jun Kim ◽  
Il-Kyu Yoon ◽  
...  
Keyword(s):  
Global Warming ◽  
Elevated Temperature ◽  
Open Top Chamber ◽  
Forage Maize

scholarly journals The Unseen Drivers of Coral Health; Coral Microbiome; The Hope for Effective Coral Restoration

2021 ◽  
Author(s):  
Hala F Mohamed ◽  
Yimin Chen ◽  
Amro Abd-Elgawad ◽  
CAI Rongshuo ◽  
Changan Xu
Keyword(s):  
Coral Microbiome ◽  
Coral Health

scholarly journals Beyond ratios - flexible and resilient nurse staffing options to deliver cost-effective hospital care and address staff shortages: a simulation and economic modelling study

2020 ◽  
Author(s):  
Peter Griffiths ◽  
Christina Saville ◽  
Jane E Ball ◽  
Jeremy Jones ◽  
Thomas Monks
Keyword(s):  
Cost Effectiveness ◽  
Significant Proportion ◽  
Nurse Staffing ◽  
Cost Savings ◽  
Cost Effective ◽  
Adverse Outcomes ◽  
List Type ◽  
Economic Modelling ◽  
The Face ◽  
Hospital Wards

AbstractBackgroundIn the face of pressure to contain costs and make best use of scarce nurses, flexible staff deployment (floating staff between units and temporary hires) guided by a patient classification system may appear an efficient approach to meeting variable demand for care in hospitals.ObjectivesWe modelled the cost-effectiveness of different approaches to planning baseline numbers of nurses to roster on general medical/surgical units while using flexible staff to respond to fluctuating demand.Design and SettingWe developed an agent-based simulation model, where units move between being understaffed, adequately staffed or overstaffed as staff supply and demand, measured by the Safer Nursing Care Tool, varies. Staffing shortfalls are addressed firstly by floating staff from overstaffed units, secondly by hiring temporary staff. We compared a standard staffing plan (baseline rosters set to match average demand) with a ‘resilient’ plan set to match higher demand, and a ‘flexible’ plan, set at a lower level. We varied assumptions about temporary staff availability. We estimated the effect of unresolved low staffing on length of stay and death, calculating cost per life saved.ResultsStaffing plans with higher baseline rosters led to higher costs but improved outcomes. Cost savings from low baseline staff largely arose because shifts were left under staffed. Cost effectiveness for higher baseline staff was improved with high temporary staff availability. With limited temporary staff available, the resilient staffing plan (higher baseline staff) cost £9,506 per life saved compared to the standard plan. The standard plan cost £13,967 per life saved compared to the flexible (low baseline) plan. With unlimited temporary staff, the resilient staffing plan cost £5,524 per life saved compared to the standard plan and the standard plan cost £946 per life saved compared with the flexible plan. Cost-effectiveness of higher baseline staffing was more favourable when negative effects of high temporary staffing were modelled.ConclusionFlexible staffing can be guided by shift-by-shift measurement of patient demand, but proper attention must be given to ensure that the baseline number of staff rostered is sufficient.In the face of staff shortages, low baseline staff rosters with high use of flexible staff on hospital wards is not an efficient or effective use of nurses whereas high baseline rosters may be cost-effective. Flexible staffing plans that minimise the number of nurses routinely rostered are likely to harm patients because temporary staff may not be available at short notice.Study registration: ISRCTN 12307968Tweetable abstractEconomic model of hospital wards shows low baseline staff levels with high use of flexible staff are not cost-effective and don’t solve nursing shortages].What is already known?Because nursing is the largest staff group, accounting for a significant proportion of hospital’s variable costs, ward nurse staffing is frequently the target of cost containment measuresStaffing decisions need to address both the baseline staff establishment to roster, and how best to respond to fluctuating demand as patient census and care needs varyFlexible deployment of staff, including floating staff and using temporary hires, has the potential to minimise expenditure while meeting varying patient need, but high use of temporary staff may be associated with adverse outcomes.What this paper addsOur simulation shows that low baseline staff rosters that rely heavily on flexible staff increase the risk of patient death and provide cost savings largely because wards are often left short staffed under real world availability of temporary staff.A staffing plan set to meet average demand appears to be cost effective compared to a plan with a lower baseline but is still associated with frequent short staffing despite the use of flexible deployments.A staffing plan with a higher baseline, set to meet demand 90% of the time, is more resilient in the face of variation and may be highly cost effective

scholarly journals Using naturalistic incubation temperatures to demonstrate how variation in the timing and continuity of heat wave exposure influences phenotype

2020 ◽  
Vol 287 (1932) ◽  
pp. 20200992 ◽  
Author(s):  
Anthony T. Breitenbach ◽  
Amanda W. Carter ◽  
Ryan T. Paitz ◽  
Rachel M. Bowden
Keyword(s):  
Heat Wave ◽  
Time Course ◽  
Heat Waves ◽  
Heat Exposure ◽  
Effect Of Temperature ◽  
Similar Time ◽  
Expression Of Genes ◽  
Short Period ◽  
The Face ◽  
Temperature Exposure

Most organisms are exposed to bouts of warm temperatures during development, yet we know little about how variation in the timing and continuity of heat exposure influences biological processes. If heat waves increase in frequency and duration as predicted, it is necessary to understand how these bouts could affect thermally sensitive species, including reptiles with temperature-dependent sex determination (TSD). In a multi-year study using fluctuating temperatures, we exposed Trachemys scripta embryos to cooler, male-producing temperatures interspersed with warmer, female-producing temperatures (heat waves) that varied in either timing during development or continuity and then analysed resulting sex ratios. We also quantified the expression of genes involved in testis differentiation ( Dmrt1 ) and ovary differentiation ( Cyp19A1 ) to determine how heat wave continuity affects the expression of genes involved in sexual differentiation. Heat waves applied during the middle of development produced significantly more females compared to heat waves that occurred just 7 days before or after this window, and even short gaps in the continuity of a heat wave decreased the production of females. Continuous heat exposure resulted in increased Cyp19A1 expression while discontinuous heat exposure failed to increase expression in either gene over a similar time course. We report that even small differences in the timing and continuity of heat waves can result in drastically different phenotypic outcomes. This strong effect of temperature occurred despite the fact that embryos were exposed to the same number of warm days during a short period of time, which highlights the need to study temperature effects under more ecologically relevant conditions where temperatures may be elevated for only a few days at a time. In the face of a changing climate, the finding that subtle shifts in temperature exposure result in substantial effects on embryonic development becomes even more critical.

scholarly journals Strictly protected species of hoverflies (Diptera: Syrphidae) in Serbia in the face of climate change

2018 ◽  
pp. 53-62 ◽  
Author(s):  
Marija Milicic ◽  
Marina Jankovic ◽  
Dubravka Milic ◽  
Snezana Radenkovic ◽  
Ante Vujic
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Species Distribution ◽  
Species Distribution Modelling ◽  
Protected Species ◽  
Southeastern Part ◽  
Distribution Modelling ◽  
Mountainous Regions ◽  
The Face ◽  
Intensive Land Use

Climate change is happening. Due to a spectrum of possible conse?quences, numerous studies examine the effects of global warming on species distribution. This study examines the effects of changing climate on distribution of selected strictly protected species of hoverflies in Serbia, by using species distribution modelling. Ten species were included in the analysis. Three species were predicted to lose a part of their range across time, while for seven species the range expansion was predicted. Both in the present time and in the future, mountainous regions have the highest species richness, such as Golija, Kopaonik, and Prokletije in the western Serbia, and mountains Stara Planina, Besna Kobila, Suva Planina, and Dukat in the southeastern part of the country. However, beside climate change, there are several other factors that might influence the distribution of strictly pro?tected hoverflies in Serbia, such as intensive land use and degradation of habitats. Addition?ally, global warming also affects flowering plants that syrphids are dependent on, which could present another obstacle to their future range expansions. These results can contribute to planning future steps for the conservation of strictly protected hoverfly species.

International Criminal Tribunal for the Former Yugoslavia (ICTY) (Trial Chamber): Prosecutor v. Milošć (Decision Concerning an Amicus Curiae)

2002 ◽  
Vol 41 (6) ◽  
pp. 1344-1346
Keyword(s):  
International Criminal ◽  
International Criminal Tribunal ◽  
Trial Chamber ◽  
Former Yugoslavia ◽  
List Type ◽  
Relevant Factor ◽  
Amicus Curiae ◽  
The Face ◽  
The Hague

The accused has complained about publications in two newspapers. The first was published on the 7th of September, 2002 in the Haagsche Courant, a Dutch newspaper in The Hague, and the second on the 13th September, 2002 in the Kultura, a Bulgarian newspaper in Sofia, Bulgaria. Both publications resulted from interviews given by Mr. Michail Wladimiroff, one of the three amici curiae in this case.The publication in the Haagsche Courant was captioned: “Wladimiroff: Already Enough Evidence Against Milosevic.” Mr. Wladimiroff is reported as saying, “If this trial were only about Kosovo and one had to draw up the balance now, Milosevic would certainly be convicted. A link has been established between the army and the police, the warring parties in Kosovo and Milosevic himself.”Mr. Wladimiroff explained that he had been misquoted, and that what he had said was that “we have seen during the Prosecution case at least on the face of it, there is a link between the offences in Kosovo and the accused. That may not be for all events, but even if it were half of it, it is a relevant factor for the Trial Chamber when reaching a verdict.”

Good enough tools for global warming policy making

2007 ◽  
Vol 365 (1853) ◽  
pp. 897-934 ◽  
Author(s):  
R.H Socolow ◽  
S.H Lam
Keyword(s):  
Global Warming ◽  
Public Discourse ◽  
Fossil Fuels ◽  
List Type ◽  
Target Level ◽  
Atmospheric Concentration ◽  
Urgent Task ◽  
Great Pressure ◽  
Mitigation Effort ◽  
Industrial Level

We present a simple analysis of the global warming problem caused by the emissions of CO 2 (a major greenhouse gas) into the atmosphere resulting from the burning of fossil fuels. We provide quantitative tools which enable policymakers and interested citizens to explore the following issues central to the global warming problem. At what rate are we permitted to continue to emit CO 2 after the global average atmospheric concentration has ‘stabilized’ at some chosen target level? The answer here provides the magnitude of the effort , measured by the necessary total reduction of today's global (annual) emissions rate to achieve stabilization. We shall see that stabilized emissions rates for all interesting stabilized concentration levels are much lower than the current emissions rate, but these small finite values are very important. Across how many years can we spread the total effort to reduce the annual CO 2 emissions rate from its current high value to the above-mentioned low and stabilized target value? The answer here provides the time-scale of the total mitigation effort for any chosen atmospheric concentration target level. We confirm the common understanding that targets below a doubling of the pre-industrial concentration create great pressure to produce action immediately, while targets above double the pre-industrial level can tolerate longer periods of inaction. How much harder is the future mitigation effort, if we do not do our share of the job now? Is it a good idea to overshoot a stabilization target? The quantitative answers here provide the penalty of procrastination . For example, the mitigation task to avoid doubling the pre-industrial level is a problem that can be addressed gradually, over a period extending more than a century, if started immediately, but procrastination can turn the effort into a much more urgent task that extends over only a few decades. We also find that overshooting target levels is a bad idea. The quality of public discourse on this subject could be much enhanced if ball-park quantitative answers to these questions were more widely known.

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