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Sean Nash

Health Effects from Swimming Training in Chlorinated Pools and the Corresponding Metabo... - 4 views

www.ncbi.nlm.nih.gov/...PMC4351252

swimming chlorine mice-experimenting HSR2023 blood liver pools

shared by Sean Nash on 13 Jul 23 - No Cached
  • Numerous epidemiological publications have associated the chlorination of pools with dysfunctions of the respiratory system and with some other diseases
  • Therefore, the health effects from swimming in chlorinated pools and the corresponding stress reactions in organisms are unclear. In this study, we show that although the growth and behaviors of experimental rats were not affected, their health, training effects and metabolic profiles were significantly affected by a 12-week swimming training program in chlorinated water identical to that of public pools.
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      This may prove to be a concerning fact that myself and others on the swim team swim rather consistently.
  • The epidemiological evidence for adverse health effects from swimming in chlorinated water primarily originate from studies concerning respiratory function and asthma, althoughVillanueva et al. reported a significant increased risk of bladder cancer for swimmers compared with nonswimmers [5].
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      Kinda scary to think about the fact that swimming could be hurting my lungs.
    • Sean Nash
      Sean Nash on 13 Jul 23
       
      OK... this is all a very rare and interesting topic to me. I've never considered it. Of course, in thinking a bout this as a HS research topic, the fact that it centers around humans... is a feasibility issue. However, what sort of invertebrate models could we use in place? Would we be able to detect DBPs?
  • ...24 more annotations...
  • Interestingly, the eyes and skin are the organs that are more directly affected than the lungs by the irritants in chlorinated water; instead of chlorination, training intensity, training frequency and choking on water may be the primary factors for lung damage induced by swimming.
  • Therefore, the health effects from swimming in chlorinated pools and the corresponding stress reactions occurring in our bodies are unclear
  • he water for the EG was purified using a water purifier and then disinfected using calcium hypochlorite, similar to public swimming pools, whereas the water for the CG was only purified, not chlorinate
  • In fact, similar symptoms, red and swollen eyes, dried skin and nasal mucosal congestion, always appear after humans swim in a chlorinated pool; however, the long-term (12 weeks) and high-frequency (5 days a week) of the experimental swimming training caused even worse symptoms in these experimental rats.
  • however, some unusual appearance changes appeared in the EG rats.
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      EG rats had the exposure of a public level of chlorine.
  • First, the skin around their eyes became increasingly red with the development of the experiment, and in the ending period of the experiment, bloodstains could be observed in the rims of most rats’ eyes.
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      Wow.
  • Third, their fur became increasingly dry and lackluster, and significant signs of hair loss were observed during the last month.
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      This doesn't sound good.
  • These results indicated that the fur, respiratory tracts and eyes of the EG rats were severely affected by chlorinated water, although their growth was essentially unaffected. According to our observations, the daily behaviors and sizes of the EG rats were normal, and their final body weights were even slightly heavier than those weights of the control group. Nevertheless, dried and lackluster fur, hair removal, bloody noses and eyes did occur in the EG rats and not to the CG rats.
  • A meta-analysis performed by Goodman et al. demonstrated that the association between asthma and swimming could only be confirmed among competitive swimmers and could not be confirmed among non-competitive swimmers
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      SO competitive swimmers are the ones with an association of asthma and pool water.
  • Additionally, an interesting phenomenon was observed by comparing the development of the bloody noses and bloody eyes. The bloody noses commonly appeared in the third and in the fourth week; however, approximately two weeks later, this symptom gradually disappeared. The significantly bloody eyes commonly appeared in the ending period of the experiment; however, this problem was becoming worse during the study, and no signs of improvement appeared. The bloody noses appeared first, suggesting that respiratory tracts may be more vulnerable to the irritants from the chlorinated water than eyes; the gradually disappearing symptom suggests that respiratory tracts may have some adaptability to chlorinated water possibly because of the protection from nasal mucous. In contrast, without the mucosal protection, the bloody eyes were becoming increasingly significant during the entire experiment, although this symptom appeared later than the bloody noses.
  • The duration period from the entry into water until the rats reached exhaustion was significantly shorter for the EG rats compared with the CG rats (29.74±11.50 vs. 39.15±9.85 minutes, p<0.05)
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      Rats in chlorine swam ten minutes less on average.
  • Three rats from the EG were found liver damage, indicating that the positive rate reached 18 percen
  • or instance, Tumasonis et al. reported that a significantly increased incidence of hepatic neoplastic nodules in female rats and a significantly increased incidence of hepatic adenofibrosis in both male and female rats were induced by the chronic ingestion of chloroform [15].
  • Representative hematoxylin and eosin staining (H&E, 400×) of liver sections.
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      The liver literally changed between the two groups.
  • . We suppose that the primary differences between the competitive swimmers and non-competitive swimmers are training intensity and frequency, not the pool water.
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      An interesting theory, but I wonder if it has been proved.
  • The first three principal components (PCs) explain 57.3% of the total variance of the raw data and are sufficient to present the differences between the EG and the CG
  • In Fig. 3, we can see that the majority of the differences between the EG and the CG are explained by PC 1 and PC 3.
  • which suggests that the 12-week swimming training in chlorinated water induced a significant change in the metabolic profiles of the experimental group rats.
  • As an antioxidant, taurine can directly scavenge hypochlorous acid (HClO) and prevents changes in membrane permeability due to oxidative impairment
  • Hippurate is an inhibitor of glucose utilization in the muscle and in the kidneys, an inhibitor of glucose utilization in the kidneys and in the liver, a modulator of fatty acid metabolism, and a stimulator of ammoniagenesis
  • Chlorine is a necessary element for our bodies, and nontoxic.
    • katherine-medina
      katherine-medina on 13 Jul 23
       
      I did not know that.
  • In summary, the 12-week swimming training in chlorinated pool water did induce some disease symptoms, an impairment of training effects and a significant change in the metabolic profiles, although the growth and behaviors of the experimental animals were not affected
  • Thus, the eyes and skin might be the organs that require greater attention for permanent damage.
  • Symptoms found in the liver and lung sections indicate that the liver is most likely the most possible target organ of DBPs, and training intensity, training frequency and water choking may be the primary factors for lung damage induced by swimming, instead of chlorination. The result of the swimming capacity test showed that training effects were significant affected by chlorinated water through perturbing the TCA cycle and oxidative phosphorylation.
  • katherine-medina on 13 Jul 23
     
    A really cool article about how chlorine can affect the bodies of mice. (An article I will never be able to forget about due to it being similar to my situation.)
  • Sean Nash on 13 Jul 23
     
    A really cool article about how chlorine can affect the bodies of mice. (An article I will never be able to forget about due to it being similar to my situation.)
katherine-medina

IJMS | Free Full-Text | The Combination of Catechin and Epicatechin Gallate f... - 1 views

www.mdpi.com/1802

polyphenol catechin Research-idea HSR-2023 MRSA antibiotics

shared by katherine-medina on 24 Jun 23 - No Cached
  • efflux
  • efflux pumps
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      Wow, so MRSA can literally pump out antibiotics.
  • The advantage of the agents is that there is little or no direct selective pressure, and thus resistant strains are less likely to emerge
  • ...17 more annotations...
  • Figure 1
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      I could do something similar to this in a Petree dish like the photo above.
  • Baicalin [8], diterpenes [9], tellimagrandin I [10], corilagin [11], tripeptide [12], epigallocatechin gallate (EGCg) [13] and epicatechin gallat
  • The extracts and compounds from hawthorn have been reported to show a variety of pharmacological activities, such as a protective effect on patients with heart failure [17], as well as an increased force of myocardial contraction [18], improved coronary circulation [19], antioxidant effects [20] and antimicrobial activities [21].
  • For example, galloy catechins, such as ECg and Cg, reduced the high MIC level of β-lactams to the antibiotic breakpoint or even lower than the breakpoint [14,15,26,27], but non-galloylated catechins, such as C and EC, had no such effect
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      use galloy catechins
  • WHO-2 but ECg (32 mg/L) increased the drug accumulation
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      So, at this specific concentration ECg helped with increasing the amount of antibiotic, but not necessarily assisting the ability of the antibiotic to do damage.
  • C or ECg (32 mg/L) in combination with oxacillin produced FICIs of more than 0.5 or 0.5, demonstrating no or very weak ILSMR effect.
  • via inhibiting mRNA expression of efflux pump genes,
  • Some natural products can enhance the efficacy of β-lactam antibiotics, and therefore they are termed intensifiers of β-lactam susceptibility in MRSA
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      I would like to look into using antibiotics that are currently available to the public, and trying to enhance their ability to fight bacteria through the use of certain polyphenols or some other type of natural product.
  • In traditional Chinese medicine, hawthorn is used as a peptic agent for stimulating digestion and promoting the function of the stomach, improving blood circulation and removing blood stasis
  • We also found that when C combined with ECg, the ILSMR effect was markedly increased and the ILSMR effect of the combination (C and ECg) was enhanced with the increase in the concentration of C, with a higher concentration of C resulting in a lower FICI.
  • Overall, the different abilities of C and EGC to potentiate the ILSMR effect of ECg was presumed to be due to the difference in steric hindrance provided by the hydroxy groups in the B ring of these compounds.
  • Our results showed that C in combination with ECg could significantly reduce the MIC of these six antibiotics against almost all of the clinical MRSA strains
  • These results are significant since they demonstrate the possibility that these antibiotics can be used in the clinic when combined with C and ECg.
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      I wonder if they have started implementing this in hospitals.
  • . Therefore, a criterion suitable for more than two compounds should be investigated in the future.
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      I think that this will be a useful article to go back to when looking towards developing further ideas for experiments.
  • he above results suggested the ILSMR effect of C and ECg was probably related to the inhibition of three pumps’ mRNA expressions. Which pump(s) played a more important role should be further investigated in the future experiments.
    • katherine-medina
      katherine-medina on 24 Jun 23
       
      Interesting
  • Herein, our results showed that reserpine down-regulated mRNA expressions of norA and norC, but not abcA, and C, in combination with ECg, down-regulated mRNA expressions of norA, norC and abcA among eight efflux pumps, while ECg or C alone could not.
  • Sh
  • katherine-medina on 24 Jun 23
     
    An article discussing the affects of combining polyphenols with antibiotics in order to fight against MRSA.
Sean Nash

Mysterious Underwater Acoustic World of British Ponds Revealed in New Study | Current S... - 3 views

currentsciencedaily.com/...sh-ponds-revealed-in-new-study

hydrophone sound survey pond potential research idea biology physics computer science environmental science HSR HSR-2023

shared by Sean Nash on 04 Jun 23 - No Cached
  • The previously hidden and diverse underwater acoustic world in British ponds has been revealed by a team of researchers at the University of Bristol.
    • Sean Nash
      Sean Nash on 04 Jun 23
       
      So... my immediate thought is: How cool would it be to do this here? One thing we DO have: PONDS. See if this *sounds* interesting. Get it? ;)
  • Acoustic monitoring has been shown to effectively survey birds and monkeys in rainforests, and marine mammals in the oceans. However, freshwater environments have remained largely unexplored despite their diverse soundscapes.
    • Sean Nash
      Sean Nash on 04 Jun 23
       
      BOOM. Again, "relatively unexplored" is super exciting verbiage to me. Acoustics. Hydrophones. Is this feasible? Is the equipment affordable? If not, could we borrow one? Dig into it. What are the possibilities?
  • analysis of the audio files revealed clear daily acoustic activity cycles in each pond
    • Sean Nash
      Sean Nash on 04 Jun 23
       
      Aside from the exploratory surveys you would do just to see "what's out there" and assess what we CAN learn from listening to a pond, you could make it experimental by comparing ponds you've assessed the health of by other means. In other words, do acoustic comparisons between two ponds correlate with what you find by doing a macroinvertebrate sampling? I really LIKE the possibilities in this one!
  • ...3 more annotations...
  • Typically, a nocturnal chorus is made by aquatic insects that compete to attract mates by producing strange scratching sounds as they rub their genitals against their abdomens. During the daytime, however, aquatic plants dominate the underwater orchestra with rhythmic whining and ticking sounds produced as tiny oxygen bubbles are released by plants respiring in the hot sun.
  • Using this acoustic method, the presence of species, and a determination of ecological health, can be inferred simply by listening to the natural world without disturbing the environment or harming the plants and animals within it.
    • Sean Nash
      Sean Nash on 04 Jun 23
       
      Here is the obvious value proposition if you could work this out.
  • Publication: Jack A. Greenhalgh, et al., Diel variation in insect-dominated temperate pond soundscapes and guidelines for survey design, Freshwater Biology (2023). DOI: 10.1111/fwb.14092.
    • Sean Nash
      Sean Nash on 04 Jun 23
       
      BEST THING YET: Here is the FULL TEXT of the actual research paper!
Sean Nash

Microwaving an insecticide restores its mosquito-killing power - 2 views

www.sciencenews.org/...to-microwave-insecticide-spray

deltamethrin pesticide mosquito insecticide DDT crystals crystalline structure biochemistry environment evolution ecology chemistry heat potential research idea biology engineering environmental science HSR HSR-2023 HSR-2025

shared by Sean Nash on 25 May 23 - No Cached
  • Heating an insecticide can give it new life.
    • Sean Nash
      Sean Nash on 25 May 23
       
      Wait, what? Do say more.....
  • Microwaving the insecticide deltamethrin rearranges its crystal structure but doesn’t change its chemical composition. The rearrangement renews deltamethrin’s ability to kill mosquitoes that have become resistant to the insecticide, researchers report April 21 in Malaria Journal.
    • Sean Nash
      Sean Nash on 25 May 23
       
      Hmmmm... something similar to this smells like: feasibility.
  • The microwave worked just as well, but Kahr cautions that people shouldn’t use the same microwave for heating food and insecticides.
    • Sean Nash
      Sean Nash on 25 May 23
       
      Ha! No kidding??
  • ...6 more annotations...
  • insecticide resistance is a growing problem
  • It is encouraging that heated insecticide killed highly resistant mosquitoes, says Hemingway, who directs the Infection Innovation Consortium, a public-private effort to find new ways to combat infectious diseases. But, she says, “this is not something we can take and use that tomorrow.”
    • Sean Nash
      Sean Nash on 25 May 23
       
      OK.... this is how you can find an opening (not saying THIS ONE is necessarily, but, when you see language like: "we can't really do it just yet," that is a screaming opportunity to see what we MIGHT be able to add to that.
  • It’s not certain that the heat-treated deltamethrin would retain its more potent crystal structure through the net-making process.
  • Kahr’s team is working on incorporating the heat-treated crystal into nets.
  • “There are all kinds of social and cultural things that you could propose from a scientific perspective that wouldn’t be welcomed by a community of homeowners.”
    • Sean Nash
      Sean Nash on 25 May 23
       
      Again... this reads: "potential research opportunity."
  • Kahr and colleagues previously discovered that heating deltamethrin changed its crystal structure, which let it work faster
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