Joined in 2023 
82 
63 About this deal
To inspect the consequence of Hg 2+ concentration on the morphology, the bacterial cells were freshly grown in the presence (50 and 100 mg/L - test samples) and absence (control) of Hg 2+ as HgCl 2; and cell pellets were harvested by centrifugation (5000 rpm at 4°C for 5 min) after 48 h. SEM analysis has been carried out, as reported by Joshi etal. (2021). In brief, the bacterial cells were fixed with 2.5% glutaraldehyde followed by the post-fixing in 1% osmium tetroxide and dehydration of the cells with graded ethanol series (25%, 50%, 80%, 90%, and absolute). The processed samples were scanned using SEM (JEOL-JSM-IT500). Extraction of metabolites and Gas Chromatography-Mass Spectrometry (GC-MS) analysis It can be observed that high Hg concentration causes structural deformities which may be due to its toxic nature. In our previous study, we reported that cultures accustomed to grow in the presence of HgCl 2 manifested major morphological abnormalities ( Joshi etal., 2021). We also suggested several structural asymmetries allied with the cell wall and cytoplasmic membrane, significantly affecting the cellular mechanism. Resultantly, there is a substantial delay at the beginning of growth and cell division in a higher concentration of Hg 2+. Metabolites formed during Hg (II) reduction Enter [email protected] as the Account name and then enter or paste the manual entry code in from above as the 'Secret key'.
The Mediterranean diet (Med Diet) has also helped lower BP. As per the Maine-Syracuse Longitudinal Study conducted in the United States in 2020 by a group of researchers who followed 851 US older adults, for every one unit increase in the Med Diet score in participants, it was found that there was a corresponding reduction of 0.69 units in SBP, a reduction of 0.33 in DBP, and a reduction of 0.45 on mean arterial pressure (MAP) [ 32]. Although this seems to be small, this change can have a noteworthy effect at the level of the population; that is, a decrease of 2 mm Hg in SBP can lead to a decrease of 10% when it comes to the population [ 32]. According to the observational studies conducted in Mediterranean countries, higher adherence to a Med Diet is associated with a decreased risk of cardiovascular disease, overall mortality as well as neoplastic disease [ 33, 34]. The Med Diet consists of higher consumption of extra virgin olive oil, vegetables, fruits, whole grains, nuts, cereals, as well as seeds; moderate consumption of fish, poultry, red wine, and dairy; and lower consumption of processed foods and red meat [ 35]. A conserved region of merA gene encoding bacterial mercuric reductase enzyme was detected using the above isolated genomic DNA ( Joshi etal., 2021). The PCR reactions were carried out using the primer set F1merA (5’-TCGTGATGTTCGACCGCT-3’) and F2merA (5’-TACTCCCGCCGTTTCCAAT-3’) containing 1 U/μl Taq polymerase (Sigma-Aldrich), 1 × Enzyme buffer, 200 μM of each dNTP (Sigma-Aldrich), 1.25 mM MgCl 2, and 0.5 μM of each primer and 50 ng template DNA in a thermal cycler (Applied Biosystems). PCR reaction was carried out under the following amplification conditions: pre-denaturation step at 94°C for 2 min followed by 30 cycles of 94°C for 1 min, 52°C for 1 min and an extension step at 72°C for 1 min and final extension at 72°C for 7 min as described by Dash and Das, (2014). For the isolates that showed negative PCR reactions with F1merA and F2merA primer set, a re-attempt has been made for amplifying the merA gene by gradient PCR method (annealing at 54 ± 5°C) and by using another set of primer A1F (5′-ACCATCGGCGGCACCTGCGT-3’) and A5R (5′-ACCATCGTCAGGTAGGGGACCAA3-′) as described by De etal. (2008). Amplification of the merA gene was confirmed by visualizing it under the Gel Doc system (BioRad). Confirmation of Hg 2+ to Hg 0 reduction by the isolates In prior studies, many pathways have been reported for Hg 2+ detoxification in microbes using various tools and technologies ( Chang etal., 2020; Cursino etal., 2000; Chang etal., 2021). In the present study, a metabolic pathway is hypothesized based on the GC-MS metabolites and protein-ligand interaction ( Figure S6) and an attempt has been made to correlate the proposed pathway with the different components of the already existing pathways. In this preliminary study, we found that general resistance/detoxification mechanisms of NIOT-EQR_J248 and NIOT-EQR_J251 in response to inorganic mercury (Hg 2+) exposure were a multisystem combined process. The selected isolates were further analyzed by subjecting them to 16S rDNA sequencing. In brief, DNA was isolated and the polymerase chain reaction (PCR) amplification was executed with the universal 16S rDNA primers of 27F (5’-AGAGTTTGATCMTGGCTCAG-3’) and 1495R (5’-GGHTACCTTGTTACGACTT-3’) as described by Dash and Das (2014). The amplified PCR products were sequenced and submitted to NCBI, as described by Kumar etal. (2018). The detailed procedure is elaborated in the SI. Genotyping of merA gene Many studies suggest that mer operon is located on any one of either location such as mobile elements like plasmids, transposons, genomic or chromosomal DNA ( Liebert etal., 1999; Schelert etal., 2004; Zeng etal., 2010). The mer operon contains many functional genes along with the operator, promoter, and regulatory elements. All functional genes encrypt for the diverse proteins that contribute to the detection, transportation, and reduction of Hg ions ( Barkay etal., 2003; Dash and Das, 2012; Naguib etal., 2018). An extremely noteworthy positive correlation was found among the harboring of mer gene with the phenotypic resistance to Hg and concentration of the Hg in the source environment ( Osborn etal., 1997). In this study, we did not find any Hg from the ecosystem (detectable limit - 0.73 µg/L), but the amplification of mer genes and available literature suggested that these are extensively dispersed in a non-highly contaminated or contamination-free environment such as an open ocean, Antarctic sea-ice, high Arctic snow, sea ice brine etc. and plays a key role in the biogeochemical cycle of Hg ( Christakis etal., 2021). Thus, the Hg adaptation by these isolates is reasonably accepted. Confirmation of Hg 2+ reduction by the isolatesGJ: Conceptualization, Methodology, Formal analysis, Investigation, Writing-original draft, Writing-review & editing. PV: Investigation, Formal analysis, Writing-review & editing. BM: Investigation. PG: Formal analysis. DMP: Investigation. DKJ: Writing-review & editing. NVV: Supervision, Project administration, Writing-review & editing. GD: Supervision, Project administration, Writing-review & editing. All authors contributed to the article and approved the submitted version. Funding The GC-MS study was included to get insight into the metabolic changes in the MRB isolates under Hg stress. It revealed that the metabolic profiles of MRB isolates are diverse with different biological properties. GC-MS metabolic profiles revealed that the number of compounds increased in the presence of Hg compared to the control isolates, where some compounds were found to be different in Hg-treated samples. A total of 50 metabolites were identified in the absence of Hg, whereas with 50 mg/L of Hg, 64 compounds were identified. The minimum metabolites (6) were identified in NIOT-EQR_J258 without Hg, whereas the maximum metabolites (22) was identified in NIOT-EQR_J251 with Hg 2+. The NIOT-EQR_J7 metabolic profile was almost the same in both control and Hg-treated samples. A total of 14 metabolites were present in the control sample, whereas 15 metabolites were identified with Hg. In the case of NIOT-EQR_J248, NIOT-EQR_J251, and NIOT-EQR_J258, a total of 10, 20, and 6 compounds were identified in the control sample, whereas 16, 22, and 11 metabolites were present with Hg, correspondingly. Now the top of the interior is clean, it's time to shake and beat the mats. That will deal with the larger bits of dirt. Briasoulis et al., in their meta-analysis of 16 prospective long-term studies, revealed that alcohol consumption of more than 20 g per day increases the risk of HTN significantly in women, whereas consumption of 31 to 40 g in men significantly increases the risk of HTN [ 54]. Nevertheless, a higher risk of HTN was observed in all individuals who consumed more than 20 g of alcohol per day, irrespective of their gender [ 54]. Ozemek et al. revealed in their study that, in persons who consume alcohol, a reduction to two standard drinks or less daily in men and one drink or less daily in women has been shown to reduce SBP by 4 mm Hg in hypertensive individuals and by 3 mm Hg in normotensive individuals [ 11].
Assorted studies have shown that IF lowers BP. Harvie et al., in their study involving 107 overweight or obese premenopausal women, showed that IF for six months helped lower SBP (p= 0.99) and DBP (p= 0.84) [ 22]. Varady et al., in their study performed for 12 weeks with IF involving 15 overweight individuals (five males, 10 females with a BMI of 20-29.9 kg/m 2 showed that IF helped lower BP with a p-value of 0.51 [ 23]. A study by Bhutani et al. involving 83 obese individuals (three males and 80 females) with a BMI of 30-39.9 kg/m 2revealed that 12 weeks of IF helped lower SBP (p = 0.254) and DBP (p = 0.570) [ 24]. In a study by Eshghinia et al., 15 overweight or obese women with a BMI ≥25 kg/m 2 who followed IF for eight weeks showed a lowering of SBP (p<0.001) and DBP (p<0.05) [ 25]. Teng et al., in their 12 weeks IF study with 28 Malay men with a BMI of 23-29.9 kg/m 2,showed a lowering in SBP (p<0.05) and DBP (p<0.05) [ 26]. Erdem et al., in their study involving 60 participants from the Cappadocia cohort with pre-HTN and HTN with SBP of 120-139 and more than or equal to 140 mm Hg, DBP of 80-80 and more than or equal to 90 mm Hg, revealed that IF helps lower SBP (p<0.001) and DBP (p<0.039) [ 27]. The upholstery suffers most. We have HG car upholstery cleaner. Or take a look at our tips for cleaning fabric car upholstery. For leather seats, we have HG deep cleaner for leather.A simplified X-ray film method was adopted to look into the Hg reduction by bacterial volatilization in the presence of 50 and 100 mg/L of Hg as HgCl 2 ( Nakamura and Nakahara, 1988; Joshi etal., 2021). Briefly, the bacterial cells were collected by centrifugation at 5,000 rpm for 10 min. and washed with 0.07 M phosphate buffer (0.5 mM EDTA, 0.2 mM magnesium acetate, 5 mM sodium thioglycolate; pH 7.0) and transferred to the microplate. The cells were suspended into 50 µL of 0.07 M phosphate buffer containing 50 and 100 mg/L of Hg as HgCl 2 in a microplate. The phosphate buffers (pH 7.0) with 50 and 100 mg/L of HgCl 2 (without bacterial cells) were used as a negative control. The plate was covered with X-ray film and incubated in the dark for 2 h at 35°C. Determination of Hg(II) depletion potential by isolates The modification in functional groups present in the culture pellets was identified by measuring the spectra in the range of 400 to 4000 cm -1 using Fourier transform infrared (FT-IR) spectroscopy (IR Affinity-I spectrometer, Shimadzu, Japan), as described by Joshi etal. (2021). In brief, 48 h grown cultures in ZMB medium without Hg supplementation were used as a control, whereas cultures with 50 mg/L of Hg supplementation were used as Hg treated. The mixtures (lyophilized cells and 2% KBr) were fixed in the FT-IR spectrometer after compressing them into translucent sample discs, followed by analyzing in ATR-FT-IR mode by following the manufacturer’s protocol. Scanning Electron Microscopy (SEM) analysis of MRB
HG car dashboard cleaner makes the interior of the car look like new. This dash cleaner cleans and protects synthetic materials, plastic, rubber, vinyl and leather. Also, the car dash cleaner intensifies the colour and restores the shine of the polished surface. The HG dashboard spray also leaves a wonderfully fresh fragrance after the treatment, but not a detectable greasy coating. How do you use HG car dashboard cleaner? In our recent study ( Joshi etal., 2021), we isolated and characterized several MRBs from the deeper depth of the Central Indian Ocean and evaluated their ability to remove Hg from the culture media. However, no bacterial strain was observed from the surface seawater samples that were resistant to Hg up to 100 mg/L. Though various bacterial strains have been isolated from the coastal and oceanic region, so far. MRB from the equatorial region of the Indian Ocean (ERIO) is not studied. It is hypothesized that the marine bacteria from ERIO could be a potential resource for the reduction of Hg 2+ as ERIO is highly dynamic in nature due to high current and intense climatological precipitation ( Annamalai, 2010).Hg tolerance of CMRBs was calculated by the broth dilution method ( Konopka and Zakharova, 1999; Santos-Gandelman etal., 2014) with some modifications. CMRB cultures grown in Zobell Marine Broth medium (ZMB, Himedia, Mumbai) without Hg supplementation were used as a positive control, whereas ZMB treated with Hg (without bacteria) was used as a negative control in this study. To ensure the uniform bioavailability of Hg to the bacteria, uniform culture conditions were maintained across different experimental treatments. Based on the growth behavior of cultures in the presence of a higher concentration of HgCl 2, the selected isolates were classified into two different categories i.e. MRB and moderate MRB (MMRB). The detailed procedure is elaborated in the SI. To understand the effects of different Hg concentrations on bacterial growth, two qualitative analyses were carried out, i.e. monitoring the optical density (OD) at 600 nm and dry biomass. 16S rDNA based identification According to the National Institute on Alcohol Abuse and Alcoholism (NIAAA), low-risk drinking is considered four drinks per day or less than fourteen drinks per week for men and less than or equal to three drinks per day and less than seven drinks per day for women [ 49]. Binge drinking is the consumption of five drinks by men and four drinks by women in a period of two hours [ 47, 50]. According to studies performed by O’Keefe et al. and Peng et al., it was shown that excessive consumption of alcohol has contributed to 16% of HTN cases worldwide [ 45, 51]. The pathophysiology of HTN in chronic alcohol consumption is by vagal inhibition and sympathetic stimulation [ 52].
Hg volatilization by bacteria involves the reduction of Hg 2+ via the mer system to Hg 0, which is less toxic. It is appealing from the essential and practical viewpoints that halophilic bacteria can also grow in the presence of a higher amount of Hg and volatilized Hg efficiently similar to the non-halophilic bacteria. The ICP-MS analysis did not detect significant Hg loss in the control sample (without bacteria), which confirms the volatility of Hg being biotic ( Table S2). Thus, our results suggested that halophilic bacteria can also remove the Hg from the growth media, indicating that it may be potentially applied in contaminated environments. The Hg comes into the ocean either through atmospheric deposition or other several natural and active or passive processes. The results of this study imply that the two marine strains of Halomonas sp., isolated from ERIO may have the ability to remove Hg 2+ from the growth medium. Identification of functional groups changed during Hg(II) reduction The DASH diet has been funded by the National Institute of Health (NIH) in various research projects to know whether specific dietary interventions helped treat HTN [ 30]. The subjects included in the study have been told to follow only dietary interventions and no other lifestyle modifications to avoid any confounding [ 30]. It was found in both hypertensive and normotensive individuals that dietary intervention alone helped reduce SBP by 6 to 11 mm Hg [ 30]. Since these results, the DASH diet, along with lifestyle modifications, has been advised as the first line of pharmacologic therapy in some instances. Several other clinical trials have shown that the DASH diet helps lower BP, cholesterol, and saturated fats as well as there is evidence that it lowers the risk of adverse cardiac events, type 2 diabetes, stroke, and obesity [ 30]. Therefore, it is crucial for clinicians, nurses, and pharmacists to educate patients about the benefits of the DASH diet [ 30]. The statistical analysis of Hg removal potential among the different species i.e., Alcanivorax xenomutans, Halomonas sp., Marinobacter hydrocarbonoclasticus and within the Halomonas spp. revealed that the Hg removal by NIOT-EQR_J251 was significantly higher (p< 0.01) than NIOT-EQR_J7 and NIOT-EQR_J258. There was a significant difference (p< 0.05) in the removal of Hg between NIOT-EQR_J248 vs. NIOT-EQR_J258 and NIOT-EQR_J248 vs. NIOT-EQR_J251. Al-Mailem etal. (2011) reported Haloferax sp. (HA1 and HA2), Halobacterium sp. HA3, and Halococcus sp. HA4 effectively volatilized (from 40 to 65%) the available 100 mg/L of Hg after 8 days. Many other isolates such as Bacillus sp., Pseudomonas stutzeri, Pseudomonas putida, Vibrio fluvialis could volatilize 60%-95%, 94%, 100%, 60% of Hg 2+, respectively, from culture ( Zhang etal., 2012; Dash etal., 2013; Giri etal., 2014; Saranya etal., 2017; Zheng etal., 2018). The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Publisher’s noteAccording to a study performed by Fuchs et al. in 2021, it has been found that, especially in women, the risk has been found to start at moderate alcohol consumption, and alcohol withdrawal has been found to promote the reduction in BP in short-term trials [ 52].Suliga et al., in their cross-sectional study of 12,285 individuals in the age group 37 to 66, described that daily alcohol consumption ranging from 0.1 g to 15 g was inversely related to the development of HTN in women, with an odds ratio of 0.67, 95% confidence interval of 0.59 to 0.75, p-value <0.001 [ 53]. However, in men, this relation was not observed [ 53]. Increased physical activity has been advocated as the first-line intervention for preventing and treating patients with prehypertension and as a treatment strategy for patients with stage 1 or stage 2 HTN, according to the Duthe American College of Sports Medicine, the United States Joint Nations Committee on Prevention, Detection, Evaluation, and Treatment of High BP, the World Health Organization and International Society of Hypertension, and The National Heart Foundation [ 36]. Exercise can consequently help prevent prehypertension from progressing and can help reduce or stop medications prescribed for the treatment of stage 1 HTN [ 37]. Spray the HG car dashboard cleaner thinly and evenly onto the surface to be treated. Keep the can upright and approximately 20cm away from the dashboard. Physicians play a key role in encouraging and helping patients achieve smoking cessation [ 56]. HTN has also been associated with second-hand smoke. According to research done by Bernabe-Ortiz et al. on 897 individuals in Peru in 2021 to assess the association of second-hand smoke with HTN and cardiovascular risk, 15% of adults reported second-hand smoke overall, and this emphasizes the necessity to keep places smoke-free to reduce the risk of cardiovascular disease [ 57].
Great Deal 
New Comment