Research and application of natural zeolite in the processes of gas purification and drying

This article describes the adsorption capability of natural zeolites for the purification and dehydration of natural gases. Studies were carried out with natural clinoptilolite treated with various cadmium and titanium solutions. Zeolite-containing rocks were used as a natural adsorbent and experiments using a synthetic CaA zeolite were also carried for comparison. The experiments showed that zeolite from the Ai-Dag deposits possesses the highest activity in terms of sulfur compound. Its activity is closer to that of synthetic CaA zeolite. Studies showed that natural zeolites and adsorbents obtained on their basis allow the gas to be dehydrated to a dew point temperature of minus 40-45 °C. This is sufficient to prepare gas for transportation directly from the fields under any climatic conditions. Keywords: gas dehydration; zeolite; adsorbent; sulfur compounds.

Efficacy of a Zinc Lactate Mouthwash and Tongue Scraping in the Reduction of Oral Halitosis: A Single-Blind, Controlled, Crossover Clinical Trial—A Pilot Study

Halitosis is defined as an unpleasant odor that comes out of the mouth. The aim of this study was to investigate the effect of zinc lactate mouthwash and tongue scraping on oral halitosis. The study was conducted on 60 volunteers that were divided into two groups and followed two types of 14-day oral hygiene protocols on a cross-over basis after a 7-day wash-out period. One protocol was based on tooth brushing only, while the other was based on additional mouth rinsing with a zinc lactate product and tongue scraping. Morning mouth breath was assessed organoleptic and by volatile sulfur compound concentrations. The highest mean organoleptic and volatile sulfur compound measurement values were found in the tooth brushing without mouth washing and tongue scraping oral hygiene protocol (p < 0.05). The zinc lactate mouthwash combined with tongue scraping appears to be an important hygienic procedure to reduce breath odor.

A Novel Synthetic Nano-Catalyst (Ag2O3/Zeolite) for High Quality of Light Naphtha by Batch Oxidative Desulfurization Reactor

Oxidative desulfurization process (ODS), enhanced with a novel metal oxide (Ag ions) as an active component over nano-zeolite that has not been reported in the literature, is used here to improve the fuel quality by removing mercaptan (as a model sulfur compound in the light naphtha). Nano-crystalline (nano-support (Nano-zeolite)) composite is prepared by Incipient Wetness Impregnation method loaded with a metal salt to obtain 0.5, 1 and 1.5% of Ag2O3 over Nano-zeolite. The new homemade nano-catalysts (Ag2O3/Nano-zeolite) prepared are characterized by Brunauer–Emmett–Teller (BET) (surface area, pore volume and pore size), X-ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), and Scanning Electron Microscopy (SEM) analysis. The ODS process is then used to evaluate the performance of the catalysts for the removal of sulfur at different reaction temperatures (80–140 °C) and reaction times (30–50 min) in a batch reactor using the air as oxidant. 87.4% of sulfur removal has been achieved using 1% silver oxide loaded on Nano zeolite (1% of Ag2O3/Nano-zeolite) giving a clear indication that our newly designed catalyst is highly efficient catalyst in the removal of sulfur compound (mercaptan) from naphtha. A new mechanism of chemical reaction for sulfur removal by oxygen using the new homemade catalyst (Ag2O3/Nano-zeolite) prepared has been suggested in this study. The best kinetic model parameters of the relevant reactions are also estimated in this study using pseudo first order technique based on the experimental results. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Evaluating The Impact of Strigolactone GR24 On Capparis Spinosa L. Callus Production And Phenolic Compound Content

The effect of strigolactones on plants, which has been recently described as a new group of plant hormones, has not been fully characterized. Capparis spinosa L. callus formation using synthetic strigolactone GR24 (0.1 and 0.2 μM) alone or in combination with 1-naphthalene acetic acid (NAA) (2 mg / L) and 6-benzylaminopurine (BAP) (1 mg / L) and its effect on phenolic substance production were evaluated. 2 mg/L NAA+1 mg/L BAP+0.1 μM GR24 was the medium with the highest callus formation (60.3%) and callus fresh weight (120.8 mg). In the phytochemical analysis, the highest total flavonoid and phenolic substance and the highest rutin, quercetin, chlorogenic acid content were found in this application and their amounts increased at various rates compared to the control. Aromatic substances in caper calluses were grouped as sulfur compounds (66.97% -87.53%), aldehydes (4.88% -7.90%), ketones (0.34% -19.3%), hydrocarbons and derivatives (0.56%-5.8%), alcohols (% 1.62-6.08%), others (0.61% -2.37%) and their amounts varied at various hormone applications. When 0.1 μM GR24 was applied alone, the total sulfur compound in callus samples was 87.53% and the dominant substance was found to be methyl isothiocyanate.

Chemoautotrophy at the Expense of Thiosulphate: A Supplementary Nutritional Source to the Mangrove Clam-Polymesoda Erosa

Chemolithoautotrophy is a primordial process, where chemical energy converts inorganic carbon to organic. The prevalence of chemosynthesis was examined in the mangrove clam, Polymesoda erosa, and the ambient sediment at Chorao Island, Mandovi estuary, Goa. The sediment system is reducing, organically rich, high in electron donors, acceptors, and inorganic carbon. This clam thrives by immersing 75-90% of its body in sulfidic sediments. Hence, it is hypothesized that it could have an adaptive mechanism like microbially mediated utilization of reduced sulfur compound, S2O32- (model compound) coupled to inorganic carbon uptake. During spawning, maximum carbonate uptake rates of 449 and 594 nmole C g dry wt-1 h-1 were recorded in the gill and foot, respectively. Next generation sequencing revealed that Thiothrix and other sulfur oxidizers gathered from ambient sediment were present in gill, mantle and foot in the ratio 1:3:14 and 1:5:6, respectively. It is inferred that the clam and these associated bacteria could make an important contribution to chemosynthetic carbon fixation. The process could serve as an essential supplementary nutritional source especially during the physiologically feeble spawning phase. To the best of our knowledge, this is the first report of chemolithoautotrophic process in P. erosa of the family Cyrenidae.

Pengaruh Konsumsi Bonggol Nanas (Ananas comosus) Terhadap Penurunan Kadar Volatile Sulfur Compound (VSC) Pada Penderita Hipertensi Sekunder Di Puskesmas Padongko

Latar belakang: Mulut kering atau Xerostomia merupakan produksi saliva yang berkurang mengakibatkan sebagian besar fungsi saliva tidak dapat berperan dengan baik sehingga dapat menimbulkan meningkatnya Halitosis. Halitosis adalah kata lain yang berasal dari halitus (udara yang dihembuskan) dan osis (perubahan patologis) Foetor oris, Oral malodor, Mouth odor, Bad breath, and Bad mouth odor adalah nama lain untuk menggambarkan halitosis. Penelitian ini ingin mengetahui pengaruh konsumsi bonggol nanas (Ananas comosus) terhadap penurunan kadar Halitosis pada penderita Hipertensi yang mengkomsumsi obat-obatan anti hipertensi. Tujuan: Mengetahui pengaruh konsumsi bonggol nanas (Ananas comosus) terhadap penurunan kadar Volatile sulfur compound (VSC) pada penderita hipertensi sekunder di puskesmas padongko. Bahan dan Metode: Metode True Exsperimental dengan menggunakan desain penelitian Pretest-Posttest. Objek penelitian yaitu penderita Hipertensi sekunder yang mengkonsumsi obat-obatan anti Hipertensi dengan jumlah 16 orang. Pengolahan data menggunakan SPSS versi 25 dengan menggunkan uji normalitas Shapiro-Wilk dan Selanjutnya di lakukan Uji Wilcoxon. Hasil: uji Wilcoxon dengan tingkat signifikansi P = 0,000 (< 0,05), Sehingga dapat disimpulkan bahwa ada perbedaan skor kadar Volatile sulfur compound (VSC) pada penderita hipertensi sekunder dengan pemberian perlakuan konsumsi bonggol nanas (Ananas comosus). Kesimpulan: Ada pengaruh komsumsi Bonggol nanas (Ananas comosus) terhdap penurunan kadar Volatile sulfur compound (VSC) pada penderita Hipertensi sekunder.