In Old English, at least according to the online Old English Translator, there were two words, the adjective blæc, which meant black and the adjective blac, which meant pale, shining, white, along with the related verb blæcan, which meant to whiten, bleach.
The higher positivity rate in 1% bleach can be seen clearly in the graph of Figure 1 (90% in 1% bleach vs 56% in non-bleach). The factor that may contribute to increase the positivity rate is the capability of bleach to digest the mucin and make the background clearer.8 The study by Bonnet et al. in Kenya within high risk population of HIV, showed that bleach sedimentation is an effective and simple method to improve microscopy result. As we can see from Figure 2, the smear background seemed clearer than direct smear, which is consistent with study from Kenya and Nigeria, as digested smear performed well and more positive result than direct smear.8,9
David et al. argued that bleachprocessed sputum is an alternative to current diagnostic practice in low resource settings. 10 The study was conducted using 5% NaOCl for 15 minutes incubation and centrifugation, thus the bleach-processed smear yield a higher result as 15.4% and there was no loss of positive result compared to nonbleach processed smear.10 Compared to this study, the 1% bleach-processed group yield a 34% higher rate than the non-bleach smear, bigger number of positive result than previous study with smaller concentration and non-centrifugation method.
Other parts of the ocean will warm up as well. For instance, a lack of trade winds blowing from the Americas to Asia means that warm water will move toward the Americas, warming up the Atlantic Ocean, the Gulf of Mexico and the Caribbean Sea. El Niños also weaken the mid-year westerly winds over the Indian Ocean that usually cool the sea surface, so the water warms up there as well. Elevated temperatures across the global ocean can lead to mass coral bleaching events like those between 2014 and 2017.
Houk of the University of Guam said he expects the next El Niño, whether it happens this year or another, will not only generate widespread coral bleaching, but could lead to outbreaks of crown-of-thorns starfish (Acanthaster cf. solaris), a species that preys upon coral. Scientists have observed that bleaching and invasions of crown-of-thorns starfish often go hand in hand, Houk said.
A new study by scientists at the University of Miami (UM) Rosenstiel School of Marine & Atmospheric Science shows that corals may be more severely impacted by climate warming when they contain too many symbiotic algae. The single-celled algae living inside corals are usually the key to coral success, providing the energy needed to build massive reef frameworks. However, when temperatures become too warm, these algae are expelled from corals during episodes of coral 'bleaching' that can lead to widespread death of corals. Until now, it was thought that corals with more algal symbionts would be more tolerant of bleaching because they had 'more symbionts to lose.' The new study shows that the opposite is true. googletag.cmd.push(function() googletag.display('div-gpt-ad-1449240174198-2'); ); "We discovered that the more symbiotic algae a coral has, the more severely it bleaches, showing that too much of a good thing can actually be bad," said Ross Cunning, Ph.D. student and lead author of the study. "We also learned that the number of algae in corals varies over time, which helps us better understand coral bleaching risk."His research was conducted using cauliflower coral (Pocillopora damicornis) collected from the Pacific coast of Panama. The corals were monitored for six months at the UM's Experimental Hatchery, where they slowly warmed up and ultimately bleached. The number of symbiotic algae in the corals was studied by analyzing DNA samples with new highly sensitive genetic techniques that determine the ratio of algal cells to coral cells. This improved technique made the discovery possible by showing that corals with more algae bleached more severely than those with fewer algae."Corals regulate their symbionts to match the environment in which they are found, and this study shows there is a real cost to having too many," said co-author Andrew Baker, associate professor at UM's Rosenstiel School. "There are real-world implications of this. Corals will be more vulnerable to bleaching if they are found in environments which increase the number of symbionts, such as coastal reefs polluted by wastewater and runoff. If we can improve water quality, we might be able to buy some time to help these reefs avoid the worst effects of climate change."Other environmental changes, including ocean acidification as a result of increasing carbon dioxide emissions, might also influence bleaching vulnerability in ways we haven't thought of before," Baker added. More information:"Excess algal symbionts increase the susceptibility of reef corals to bleaching", Nature Climate Change, 2012.Journal information:Nature Climate Change
NEW YORK, Sept. 6, 2023 /PRNewswire/ -- The bleach market is expected to grow by USD 376.56 million from 2022 to 2027. In addition, the growth momentum of the market will progress at a CAGR of 4.36% during the forecast period, according to Technavio. We provide a detailed analysis of 20 companies operating in the bleach market including Aditya Birla Management Corp. Pvt. Ltd., , Gujarat Alkalies and Chemicals Ltd., Hawkins Inc., Hill Brothers Chemical Co., Kemira Oyj, Lords Chloro Alkali Ltd., Mitsubishi Gas Chemical Co. Inc., Nouryon Chemicals Holding BV, Solvay SA, Sree Rayalaseema Hi Strength Hypo Ltd., Stearns Packaging Corp., Swastik Chemicals, and The Clorox Co. Arkema Group, Ashland Inc., BASF SE, Clariant International Ltd., Ecolab Inc., EnviroChem International Pty Ltd., Evonik Industries AG. Increasing demand for bleach for water treatment is notably driving the bleach market. However, factors such as biodegradation and biohazard risks may impede market growth. The market is segmented by end-user (Water treatment, Industrial bleach, Dentistry, and Household cleaning), grade type (food grade and industrial grade), and geography (APAC, North America, Europe, Middle East and Africa, and South America). The report offers an up-to-date analysis of the market, and to know the exact growth variance and the Y-O-Y growth rate, Request a FREE Sample Report.
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Adaptation, acclimatization and symbiont diversity are known to regulate thermal tolerance in corals, but the role of these mechanisms remains poorly constrained in other photosymbioses, such as large benthic foraminifera (LBFs), which are known to bleach at temperatures that are likely to be exceeded in the near future. LBFs inhabit a broad range of shallow-water settings. Within species, differences in thermal tolerance have been found among populations from different habitats, but it is not clear whether such differences occur among LBFs inhabiting similar habitats, but differing in other aspects, such as symbiont type. To this end, we compared responses to thermal stress in specimens from a population of Amphistegina lessonii, an abundant Indo-Pacific species, to specimens of Amphistegina gibbosa, its Atlantic counterpart, from a similar environment but two different water depths (5 and 18 m). Test groups of each species were exposed in a common experiment to three thermal stress scenarios over a four-week period. Growth, respiration, mortality and motility were measured to characterize the holobiont response. Coloration, photosynthesis and chlorophyll a content were measured to determine the response of the endosymbiotic diatoms. The photosymbionts were characterized by genetic fingerprinting. Our results show that, although groups of A. gibbosa were collected from different habitats, their responses were similar, indicating only marginally higher tolerance to thermal peaks in specimens from the shallower site. In contrast, species-specific differences were stronger, with A. lessonii showing higher tolerance to episodic stress and less pronounced impacts of chronic stress on motility, growth and photosymbiont performance. These interspecies variations are consistent with the presence of different and more diverse symbiont assemblages in A. lessonii compared with A. gibbosa. This study demonstrates the importance of considering symbiont diversity in the assessment of intra- and interspecific variations in stress responses in LBFs.
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