scholarly journals Evaluasi Stabilitas Sediaan Krim Ekstrak Etanol Daun Afrika (Vernonia amygdalina Delile) dengan Basis Vanishing Cream (VC)

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Maria T. Nainggolan ◽  
Eva S. Simaremare ◽  
Rani D. Pratiwi
Keyword(s):  
Physical Properties ◽  
Room Temperature ◽  
Homogeneity Test ◽  
Stability Evaluation ◽  
Sample Collection ◽  
Vernonia Amygdalina ◽  
Safety Test ◽  
Temperature Observation ◽  
The Stability ◽  
Spreading Test

Daun afrika (Vernonia amygdalina) contains flavonoids, tannins, saponins, and terpenoids that can be used for pharmacology activity: annihilate the parasites that causing schistosomiasis, malaria leishmaniasis, antiamoeba, antitumor and antimicrobials. The purposes of this research were to screen the phytochemistry of african leaf, formulate and test the stability of vanishing cream (VC) base. The methods used were sample collection, extract preparation, formulation, and stability evaluation. The results showed that extract afrika leaves had alkaloids, flavonoids, tannins, saponins, steroids, and triterpenoids. Extract of daun afrika can be made to good VC base formula including organoleptic test, homogeneity test, pH test, spreading test, sticky test, and VC safety test by distributing questionnaires. The cream was stabil for 21 days at room temperature. Observation of physical properties good performed every week to organoleptis, pH, adhesion, and spreading power.  Key words: stability, V. amygdalina, kill parasites, Vanishing Cream

scholarly journals ANALISIS SIFAT FISIK TANAH PADA AREAL BEKAS TEBANGAN HUTAN TANAMAN INDUSTRI (HTI) KABUPATEN GORONTALO UTARA PROVINSI GORONTALO

2018 ◽  
Vol 1 (1) ◽  
pp. 15
Author(s):  
Dian Puspaningrum ◽  
Murni Djabar
Keyword(s):  
Physical Properties ◽  
Soil Texture ◽  
Plant Industry ◽  
Sample Collection ◽  
True Nature ◽  
Land Clearing ◽  
The Stability ◽  
State Of The Environment ◽  
Orange Color ◽  
Properties Of Soil

The ground as a system that dynamic, the ground can be turned off than time to tim , according its properties which includes the physical properties , the chemical nature and the nature of mechanical, as well as the state of the environment that productivity a whole determine the ground .A pattern of land use affect the trait of land especially the physical properties of a soil , because the use of or cultivation of the land can result in a system of capillaries on the dotted the ground and the breakdown of the limits of the horizon the ground which gives rise to a setback the physical properties of soil and chemical , as forfeited to the element of the disturbances and organic matter .  The opening of the woodland plant industry ( HTI ) indirectly affect the physical properties on the ground .Reason this is research objectives , which is to know the true nature of the physical land in the land clearing areal woodland plant industry (HTI). This research is divided into two (2) , activities in the field of the sample collection and testing the sample in the laboratory .The sample collection in the field in a purposive sampling .While the sample done in a laboratory to determine soil texture ,the permeability, the heavy volume ,a color of soil ,the stability of a structure.The result showed that a color of soil the area of land clearing dominated by the orange color criteria class texture clay , to be the area of natural forest dominated by a shade of brown with class criteria soil texture loam clays , and to the acreage the planting of crops jabon the age of 4 years is dominated by a shade of brown with class criteria soil texture loam clays .Permeability class each area ranged ranging from class criteria rather slow until with the class rather fast.

Enhancing Titanium Stability in Fusayama Saliva Using Electrochemical Elaboration of TiO2 Nanotubes

2008 ◽  
Vol 59 (6) ◽  
Author(s):  
Isabela Man ◽  
Cristian Pirvu ◽  
Ioana Demetrescu
Keyword(s):  
Tio2 Nanotubes ◽  
Room Temperature ◽  
Large Range ◽  
Stability Evaluation ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After ◽  
The Stability ◽  
Tube Structure

Titanium having low density, stability and biocompatibility, is one of the most promising biomaterial of the century even with the natural passive stratum [1,2], but building a nano-tube structure in the last decade using various procedure could lead also to an improvement of a quite large range of properties important in applied chemistry. The aim of the paper is to elaborate electrochemically TiO2 nanotubes and to evaluate the stability increase of Titanium in Fusayama saliva changing the surface morphology from micro TiO2 to TiO2 nanotubes. Anodization at room temperature in a mixture of (NH4)2SO4 and NH4F, was the choice of nanotubes structures elaboration, and cyclic voltammetry was the procedure of stability evaluation. The surface analysis was performed using scanning electron microscopy (SEM), energy-dispersive X-ray microanalysis (EDAX), and atomic force microscopy before and after anodization.

scholarly journals The Impact of Delayed Storage on the Measured Proteome and Metabolome of Human Cerebrospinal Fluid

2011 ◽  
Vol 57 (12) ◽  
pp. 1703-1711 ◽  
Author(s):  
Therese Rosenling ◽  
Marcel P Stoop ◽  
Agnieszka Smolinska ◽  
Bas Muilwijk ◽  
Leon Coulier ◽  
...  
Keyword(s):  
Cerebrospinal Fluid ◽  
Cystatin C ◽  
Room Temperature ◽  
Close Contact ◽  
Selected Reaction Monitoring ◽  
Sample Collection ◽  
Metabolome Analysis ◽  
Sample Handling ◽  
The Stability ◽  
The Impact

BACKGROUND Because cerebrospinal fluid (CSF) is in close contact with diseased areas in neurological disorders, it is an important source of material in the search for molecular biomarkers. However, sample handling for CSF collected from patients in a clinical setting might not always be adequate for use in proteomics and metabolomics studies. METHODS We left CSF for 0, 30, and 120 min at room temperature immediately after sample collection and centrifugation/removal of cells. At 2 laboratories CSF proteomes were subjected to tryptic digestion and analyzed by use of nano-liquid chromatography (LC) Orbitrap mass spectrometry (MS) and chipLC quadrupole TOF-MS. Metabolome analysis was performed at 3 laboratories by NMR, GC-MS, and LC-MS. Targeted analyses of cystatin C and albumin were performed by LC–tandem MS in the selected reaction monitoring mode. RESULTS We did not find significant changes in the measured proteome and metabolome of CSF stored at room temperature after centrifugation, except for 2 peptides and 1 metabolite, 2,3,4-trihydroxybutanoic (threonic) acid, of 5780 identified peptides and 93 identified metabolites. A sensitive protein stability marker, cystatin C, was not affected. CONCLUSIONS The measured proteome and metabolome of centrifuged human CSF is stable at room temperature for up to 2 hours. We cannot exclude, however, that changes undetectable with our current methodology, such as denaturation or proteolysis, might occur because of sample handling conditions. The stability we observed gives laboratory personnel at the collection site sufficient time to aliquot samples before freezing and storage at −80 °C.

Evaluation of sample stability for a quantitative faecal immunochemical test and comparison of two sample collection approaches

2018 ◽  
Vol 55 (6) ◽  
pp. 657-664 ◽  
Author(s):  
Samantha Mellen ◽  
Maria de Ferrars ◽  
Claire Chapman ◽  
Sarah Bevan ◽  
James Turvill ◽  
...  
Keyword(s):  
Room Temperature ◽  
False Negative ◽  
Haemoglobin Concentration ◽  
Sample Collection ◽  
Negative Results ◽  
Collection Device ◽  
Sample Stability ◽  
Haemoglobin Measurement ◽  
Standard Collection ◽  
The Stability

Background Faecal immunochemical testing is increasingly being used to triage symptomatic patients for suspected colorectal cancer. However, there are limited data on the effect of preanalytical factors on faecal haemoglobin when measured by faecal immunochemical testing. The aim of this work was to evaluate the stability of faecal haemoglobin in faeces and to compare two methods of faecal haemoglobin sampling for faecal immunochemical testing. Methods Six patients provided faeces for faecal haemoglobin measurement which were transferred into specialized collection devices at baseline and at 1, 2, 3 and 7 days after storage at either room temperature or 4°C. A total of 137 patients returned both faeces transferred into the specialized collection device and faeces in a standard collection pot. A quantitative immunoturbidometric method was used to measure faecal haemoglobin and results were compared categorically. Discrepant results were assessed against diagnosis. Results Faecal haemoglobin concentration declined rapidly within a day of storage at room temperature but results remained ≥10 μg Hb/g faeces in 5/6 patients after two days. A faecal haemoglobin result ≥10 μg Hb/g faeces was obtained in 4/6 patients after storage for seven days at 4°C. Results obtained when patients used specialized collection devices were significantly different from results obtained when faeces was transferred into the specialized collection device in the laboratory. Conclusion There is considerable heterogeneity in the sample stability of faecal haemoglobin; therefore, samples should be transferred rapidly into specialized collection devices to prevent false-negative results. Use of collection devices by patients can lead to false-positive results compared with their use in a laboratory.

scholarly journals The Fabrication and Characterizations of Coal Briquettes Composed by Charcoal – Clay – Rice Husk Ashes and Adhesive

2019 ◽  
Vol 1 (2) ◽  
pp. 125-131
Author(s):  
Manis Sembiring
Keyword(s):  
Physical Properties ◽  
Mass Loss ◽  
Specific Heat ◽  
Room Temperature ◽  
Hydraulic Press ◽  
Rice Husks ◽  
Heat Value ◽  
Ignition Characteristics ◽  
The Stability ◽  
Adhesive Materials

Coal briquettes are solid materials that can be used as fuels. The composition of this solid fuels are mixed by clay as the ashes binder, rice husks powder as flame additives, and starch flour as adhesive materials. These materials were prepared in different ratio to be mixed homogeneously which are determined accordingly. The fabrication was conducted by mixing methods, and pressed by hydraulic press within 3100 KPa. The results were placed inside an oven to be dried for 24 hours within 85oC of temperature, followed by 24 hours of allowing standing in room temperature. Afterward, the characterizations of the coal briquettes were done by performing density and compressive strength, while the others physical properties such as specific heat, combustion, and purity properties were also tested. The physical properties showed that coal briquettes are flammable and high ignition characteristics. The stability and speed of combustion to fire have continuous and fixed combustion indicated by the presence of solid ashes. The samples suggested that the M1 samples provided fragile ashes with mass loss accounted for 56.33%, and it has the highest specific heat values accounted for 246.66 Kcal/Kg. Meanwhile, the lowest specific heat value was 162.26 Kcal/Kg which was M4 samples with mass loss for 34.53%.

scholarly journals A SIMPLE FORMULATION OF LIP BALM USING CARROT EXTRACT AS A NATURAL COLORING AGENT

2019 ◽  
Author(s):  
Nur Tsalits Fahman Mughni
Keyword(s):  
Room Temperature ◽  
Skin Irritation ◽  
Optimum Combination ◽  
Shea Butter ◽  
Natural Material ◽  
Homogeneity Test ◽  
Simple Formulation ◽  
Irritation Test ◽  
The Stability ◽  
Combination Formulation

This study aims to obtain an optimum combination formulation of cera alba in the manufacture of lip balm with natural material collorant in accordance with SNI. The experimental method used was maceration of natural products with n-hexane solvents and concentrated with a rotary evaporator to find a dark yellow paste. Furthermore, making lip balm with various formulations of 2 gr cera alba, 2.5 gr, 3 gr and without cera alba in 10 gr shea butter with additives of orange and stawbery essence and natural coloring agent from carrots. The stability of lip blam the homogeneity test was carried out, the stability test carried out for 20 days at room temperature by observing changes in color, odor, and dosage form, pH test, topical test, and irritation test. The experimental results showed that all lip balm preparations were homogeneous, had a pH of 5-5,5 and did not cause skin irritation after 10 minutes of applying to the skin.

Methods for the Concentration of Bovine Ac-Globulin (Factor V)

1961 ◽  
Vol 06 (03) ◽  
pp. 435-444 ◽  
Author(s):  
Ricardo H. Landaburu ◽  
Walter H. Seegers
Keyword(s):  
Room Temperature ◽  
Barium Carbonate ◽  
Deae Cellulose ◽  
Reducing Agents ◽  
Factor V ◽  
Isoelectric Precipitation ◽  
Stabilizing Agent ◽  
Bovine Plasma ◽  
The Stability

SummaryAn attempt was made to obtain Ac-globulin from bovine plasma. The concentrates contain mostly protein, and phosphorus is also present. The stability characteristics vary from one preparation to another, but in general there was no loss before 1 month in a deep freeze or before 1 week in an icebox, or before 5 hours at room temperature. Reducing agents destroy the activity rapidly. S-acetylmercaptosuccinic anhydride is an effective stabilizing agent. Greatest stability was at pH 6.0.In the purification bovine plasma is adsorbed with barium carbonate and diluted 6-fold with water. Protein is removed at pH 6.0 and the Ac-globulin is precipitated at pH 5.0. Rivanol and alcohol fractionation is followed by chromatography on Amberlite IRC-50 or DEAE-cellulose. The final product is obtained by isoelectric precipitation.

Improved Sol-Gel Materials for Efficient Solid State Dye Lasers

1993 ◽  
Vol 329 ◽  
Author(s):  
Michael Canva ◽  
Patrick Georges ◽  
Jean-Fran^ois Perelgritz ◽  
Alain Brun ◽  
Fréddric Chaput ◽  
...  
Keyword(s):  
Solid State ◽  
Physical Properties ◽  
Room Temperature ◽  
Sol Gel ◽  
Tunable Lasers ◽  
Optical Quality ◽  
Dye Lasers ◽  
Laser Dyes ◽  
Host Matrix ◽  
Host Matrices

AbstractPhotoresistant laser dyes were trapped in silica based xerogel host matrices to obtain solid state tunable lasers. For this purpose very dense xerogel samples with improved chemical and physical properties were prepared at room temperature by the sol-gel technology. The as-prepared materials were polished to obtain optical quality surfaces and were used as new lasing media.Lasing action of such different dyes as rhodamine, perylene and pyrromethene doping dense sol-gel matrices was demonstrated. Efficiencies of 30 % or lifetimes of more than 100,000 shots were achieved with different new ≤dye dopant/host matrix≥ couples. Their different performances are reviewed and discussed.

Tyrosine-Selective Bioconjugation with Iminoxyl Radicals

2020 ◽  
Author(s):  
Katsuya Maruyama ◽  
Takashi Ishiyama ◽  
Yohei Seki ◽  
Kounosuke Oisaki ◽  
Motomu Kanai
Keyword(s):  
Reaction Time ◽  
Steric Hindrance ◽  
Room Temperature ◽  
Water Soluble ◽  
Light Irradiation ◽  
Sodium Ascorbate ◽  
Iminoxyl Radical ◽  
Short Reaction Time ◽  
Modified Peptides ◽  
The Stability

A novel Tyr-selective protein bioconjugation using the water-soluble persistent iminoxyl radical is described. The conjugation proceeded with high Tyr-selectivity and short reaction time under biocompatible conditions (room temperature in buffered media under air). The stability of the conjugates was tunable depending on the steric hindrance of iminoxyl. The presence of sodium ascorbate and/or light irradiation promoted traceless deconjugation, restoring the native Tyr structure. The method is applied to the synthesis of a protein-dye conjugate and further derivatization to azobenzene-modified peptides.

HAYNES STELLITE ALLOY No. 98M2

Alloy Digest ◽  
1960 ◽  
Vol 9 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Physical Properties ◽  
Room Temperature ◽  
Base Alloy ◽  
Heat Treating ◽  
The Other ◽  
Stellite Alloy ◽  
Cobalt Base Alloy ◽  
Cobalt Base

Abstract HAYNES STELLITE 98M2 Alloy is a cobalt-base alloy having higher compressive strength and higher hardness than all the other cobalt-base alloys at room temperature and in the red heat range. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness. It also includes information on heat treating, machining, and joining. Filing Code: Co-22. Producer or source: Haynes Stellite Company.

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