A Wake-Up Call for the Efficient Use of the Bacterial Resting Cell Process, with Focus on Low Solubility Products

2020 ◽  
Vol 77 (8) ◽  
pp. 1349-1362 ◽  
Author(s):  
Esther Moens ◽  
Selin Bolca ◽  
Sam Possemiers ◽  
Willy Verstraete
Keyword(s):  
Cell Process ◽  
Resting Cell ◽  
Solubility Products ◽  
Low Solubility

scholarly journals Analysis of Dibenzothiophene Desulfurization in a Recombinant Pseudomonas putida Strain

2008 ◽  
Vol 75 (3) ◽  
pp. 875-877 ◽  
Author(s):  
Javier Calzada ◽  
Mar�a T. Zamarro ◽  
Almudena Alc�n ◽  
Victoria E. Santos ◽  
Eduardo D�az ◽  
...  
Keyword(s):  
Pseudomonas Putida ◽  
Exponential Growth ◽  
Exponential Phase ◽  
Cell Process ◽  
Growth Phases ◽  
Early Exponential Phase ◽  
Sharp Maximum ◽  
Resting Cell

ABSTRACT Biodesulfurization was monitored in a recombinant Pseudomonas putida CECT5279 strain. DszB desulfinase activity reached a sharp maximum at the early exponential phase, but it rapidly decreased at later growth phases. A model two-step resting-cell process combining sequentially P. putida cells from the late and early exponential growth phases was designed to significantly increase biodesulfurization.

Solubility Products of Aluminum Hydroxide in Various Ionic Solutions

1973 ◽  
Vol 51 (21) ◽  
pp. 3528-3533 ◽  
Author(s):  
David T. Y. Chen
Keyword(s):  
Aluminum Hydroxide ◽  
Aluminum Chloride ◽  
Solubility Product ◽  
Ionic Solutions ◽  
Chloride Solutions ◽  
Ion Concentrations ◽  
Ph Values ◽  
Solubility Products ◽  
Low Solubility

Solubility products of Al(OH)3 were determined in various solutions of NH4+, Li+, Na+, K+, and Ca2+ ions. Increasing amounts of these hydroxides were added to the respective chloride solutions containing aluminum chloride. The solutions were aged for 3 months. Activities of the OH− ions were calculated from the pH values of the solutions. The total Al concentrations remaining in solutions were determined by Hsu's modified aluminon method. The Al3+ ion concentrations were computed using the hydrolysis equilibria of Aveston. The ion product, aAl3+(aOH−)3, was found to vary linearly with the [OH]/[Al] ratio. The solubility product of Al(OH)3 was obtained by extrapolating this ratio to 3. The pKsp values thus obtained were 30.55, 33.15, 30.75, 30.36, and 31.00 in NH4+, Li+, Na+, K+, and Ca2+ systems respectively. The anomalously low solubility product of Al(OH)3 in the Li+ system was attributed to the specific "lithium effect".

scholarly journals ANALISIS KESULITAN BELAJAR KIMIA SISWA PADA MATERI KELARUTAN DAN HASIL KALI KELARUTAN

2019 ◽  
Vol 3 (1) ◽  
pp. 7
Author(s):  
I Ketut Sudiana Sudiana ◽  
I Wayan Suja ◽  
Irma Mulyani
Keyword(s):  
Student Learning ◽  
Mixed Method ◽  
Learning Difficulties ◽  
Data Retrieval ◽  
Negative Influence ◽  
Research Subjects ◽  
Chemistry Learning ◽  
Solubility Products ◽  
Learning Interest ◽  
Low Solubility

AbstrakPenelitian ini bertujuan mendeskripsikan dan menjelaskan kesulitan belajar siswa dan faktor-faktor penyebab kesulitan belajar siswa dalam mempelajari materi kelarutan dan hasil kali kelarutan. Subjek penelitian adalah 38 orang siswa dari seluruh kelas XII IPA. Metode penelitian yang digunakan adalah mixed method. Pengambilan data dilakukan dengan cara observasi, tes, dan wawancara. Analisis data yang dilakukan adalah analisis hasil observasi, analisis hasil tes diagnostik dan analisis hasil wawancara. Data yang diperoleh berupa hasil belajar siswa dan informasi mengenai faktor-faktor penyebab kesulitan belajar siswa pada materi kelarutan dan hasil kali kelarutan. Hasil penelitian menunjukkan bahwa bentuk kesulitan belajar siswa pada materi kelarutan dan hasil kali kelarutan adalah pemahaman materi prasayarat, menuliskan ionisasi garam, penggunaan rumus Ksp, pemahaman siswa pada konsep asam basa, pemahaman siswa pada konsep kesetimbangan kimia, pemahaman siswa pada penulisan persamaan reaksi, dan kemampuan operasi matematika. Faktor-faktor penyebab kesulitan belajar siswa yang disebabkan oleh faktor internal, meliputi: minat belajar kimia rendah, motivasi belajar kimia rendah, pemaknaan konsep siswa terhadap materi kelarutan dan hasil kali kelarutan rendah, pemahaman konsep prasyarat materi kelarutan dan hasil kali kelarutan rendah, dan kemampuan siswa dalam operasi matematika yang lemah. Faktor eksternal, meliputi: pengaruh negatif dari teman sebaya dan cara mengajar guru.Kata Kunci: kesulitan belajar, kelarutan dan hasil kali kelarutanAbstractThis study aims to describe and explain student learning difficulties and the factors that cause students' learning difficulties in learning the material solubility and solubility results. The research subjects were 38 students from all XII IPA classes. The research method used is a mixed method. Data retrieval is done by observation, tests, and interviews. Data analysis was carried out by analyzing the results of observations, analyzing the results of diagnostic tests and analyzing the results of interviews. Data obtained in the form of student learning outcomes and information about the factors that cause student learning difficulties in the material solubility and solubility results. The results showed that the form of student learning difficulties in the solubility and solubility results material was understanding pre-set material, writing salt ionization, using Ksp formula, understanding students on the concept of acid base, understanding students in the concept of chemical equilibrium, understanding students in writing equation, and mathematical operating abilities. Factors that cause student learning difficulties caused by internal factors include: low chemistry learning interest, low chemistry learning motivation, meaning of students' concept of solubility and low solubility products, understanding the concept of solubility material and low solubility results, and ability students in weak mathematical operations. External factors include: negative influence from peers and how to teach teachers.Keywords: learning difficulties, solubility and solubility results

Ultrastructure of Melosira resting cell rejuvenation

1984 ◽  
Vol 42 ◽  
pp. 734-735
Author(s):  
C. E. M. Bourne ◽  
L. Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Lake Michigan ◽  
Light And Electron Microscopy ◽  
Resting Cells ◽  
Planktonic Diatoms ◽  
Resting Cell ◽  
Vegetative Survival ◽  
Cytological Changes ◽  
Recent Attention ◽  
Freshwater Diatom

Much recent attention has been focused on vegetative survival forms of planktonic diatoms and other algae. There are several reports of extended vegetative survival of the freshwater diatom Melosira in lake sediments. In contrast to those diatoms which form a morphologically distinct resistant spore, Melosira is known to produce physiological resting cells that are indistinguishable in outward morphology from actively growing cells.We used both light and electron microscopy to document and elucidate the sequence of cytological changes during the transition from resting cells to actively growing cells in a population of Melosira granulata from Douglas Lake, Michigan sediments collected in mid-July of 1983.

Solubility Enhancement of Poorly Soluble Drug Simvastatin by Solid Dispersion Technique

2016 ◽  
Vol 2 (2) ◽  
pp. 91-95
Author(s):  
Neelima Rani T ◽  
Pavani A ◽  
Sobhita Rani P ◽  
Srilakshmi N
Keyword(s):  
Dissolution Rate ◽  
Drug Carrier ◽  
Solid Dispersions ◽  
Aqueous Solubility ◽  
Onset Of Action ◽  
Kneading Method ◽  
Wetting Property ◽  
Poorly Soluble ◽  
Dispersion Technique ◽  
Low Solubility

This study aims to formulate solid dispersions (SDs) of Simvastatin (SIM) to improve the aqueous solubility, dissolution rate and to facilitate faster onset of action. Simvastatin is a BCS class II drug having low solubility & therefore low oral bioavailability. In the present study, SDs of simvastatin different drug-carrier ratios were prepared by kneading method. The results showed that simvastatin solubility & dissolution rate enhanced with polymer SSG in the ratio 1:7 due to increase in wetting property or possibly may be due to change in crystallinity of the drug.

Evaluation of Pine Bark, Pine Bark With Wood, and Pine Tree Chips as Components of a Container Plant Growing Media

1986 ◽  
Vol 4 (1) ◽  
pp. 22-25 ◽  
Author(s):  
A.J. Laiche ◽  
V.E. Nash
Keyword(s):  
Organic Amendments ◽  
Pine Bark ◽  
Growth Media ◽  
Ligustrum Sinense ◽  
Pine Tree ◽  
Water Holding ◽  
Low Solubility ◽  
Low Nitrogen ◽  
Very High ◽  
Container Plant

Three woody landscape species, Rhododendron indica ‘President Clay’, Ligustrum sinense ‘variegata’, and Ilex crenata ‘compacta’, were grown in media prepared from fresh pine bark, pine bark with wood, and pine tree chips. Although media were variable in physical properties, all exhibited very high hydraulic conductivity and low water holding capacity. The capacity of these media materials to hold fertilizer elements was very low. Nitrogen, potassium, and phosphorus were rapidly removed by leaching while calciuum and magnesium were retained longer because of the low solubility of dolomitic limestone. Pine bark was the best growth media tested for all plant species. Pine bark with wood was less satisfactory than pine bark and growth was poorest in pine tree chips. More research is needed on the use of the organic amendments with greater amounts of wood before being widely used as organic components of growth media.

A Self-Trapping, Bipolar Viologen Bromide Electrolyte for Aqueous Redox Flow Batteries

2020 ◽  
Author(s):  
wenda wu ◽  
Jian Luo ◽  
Fang Wang ◽  
Bing Yuan ◽  
Tianbiao Liu
Keyword(s):  
Redox Flow Battery ◽  
Capacity Retention ◽  
Redox Flow Batteries ◽  
Redox Electrolyte ◽  
Charge Process ◽  
Self Trapping ◽  
Flow Batteries ◽  
Total Capacity ◽  
Neutral Conditions ◽  
Low Solubility

Aqueous organic redox flow batteries (AORFBs) have become increasing attractive for scalable energy storage. However, it remains challenging to develop high voltage, powerful AORFBs because of the lack of catholytes with high redox potential. Herein, we report methyl viologen dibromide (<b>[MV]Br<sub>2</sub></b>) as a facile self-trapping, bipolar redox electrolyte material for pH neutral redox flow battery applications. The formation of the <b>[MV](Br<sub>3</sub>)<sub>2</sub></b> complex was computationally predicted and experimentally confirmed. The low solubility <b>[MV](Br<sub>3</sub>)<sub>2</sub></b> complex in the catholyte during the battery charge process not only mitigates the crossover of charged tribromide species (Br<sub>3</sub><sup>-</sup>) and addresses the toxicity concern of volatile bromine simultaneously. A 1.53 V bipolar MV/Br AORFB delivered outstanding battery performance at pH neutral conditions, specifically, 100% total capacity retention, 133 mW/cm<sup>2</sup> power density, and 60% energy efficiency at 40 mA/cm<sup>2</sup>.

NICROBRAZ 50

Alloy Digest ◽  
1994 ◽  
Vol 43 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Honeycomb Structures ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Low Solubility

Abstract NICROBRAZ 50 is a low-melting, free-flowing filter metal for honeycomb structures and thin-walled tube assemblies. It has low solubility. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-460. Producer or source: Wall Colmonoy Corporation.

Advancing the Therapeutic Efficacy of Bioactive Molecules by Delivery Vehicle Platforms.

2020 ◽  
Vol 27 ◽  
Author(s):  
Antonis D. Tsiailanis ◽  
Andreas G. Tzakos ◽  
Thomas Mavromoustakos
Keyword(s):  
Gold Nanoparticles ◽  
Angiotensin Ii ◽  
Therapeutic Index ◽  
Bioactive Molecules ◽  
Host Molecule ◽  
Delivery Vehicle ◽  
Metabolic Products ◽  
Activity Enhancement ◽  
Technological Platforms ◽  
Low Solubility

: Drugs have to overcome numerous barriers to reach their desired therapeutic targets. In several cases drugs, especially the highly lipophilic molecules, suffer from low solubility and bioavailability and therefore their desired targeting is hampered. In addition, undesired metabolic products might be produced or off-targets could be recognized. Along these lines, nanopharmacology has provided new technological platforms, to overcome these boundaries. Specifically, numerous vehicle platforms such as cyclodextrins and calixarenes have been widely utilized to host lipophilic drugs such as antagonists of the angiotensin II AT1 receptor (AT1R), as well as quercetin and silibinin. The encapsulation of these drugs in supramolecules or other systems refines their solubility and metabolic stability, increases their selectivity and therefore decreases their effective dose and improves the therapeutic index. In this minireview we report on the formulations of Silibinin and AT1R antagonist candesartan in a 2-HP-β-cyclodextrin host molecule, which displayed enhanced cytotoxicity and increased silibinin’s and candesartan’s stability, respectively. Moreover we describe the encapsulation of quercetin in gold nanoparticles bearing a calixarene supramolecular host. Also the encapsulation of temozolomide in a calixarene nanocapsule has been described. Finally, we report on the activity enhancement that has been achieved upon using these formulations as well as the analytical and computational methods we used to characterize these formulations and explore the molecular interactions between the host and quest molecules.

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