scholarly journals Synthesis, surface activities, and aggregation behavior of phenyl-containing carboxybetaine surfactants

RSC Advances ◽  
2018 ◽  
Vol 8 (58) ◽  
pp. 33256-33268 ◽  
Author(s):  
Shifeng Gao ◽  
Zhaozheng Song ◽  
Di Zhu ◽  
Fang Lan ◽  
Qingzhe Jiang
Keyword(s):  
Physicochemical Properties ◽  
Aggregation Behavior ◽  
Surface Activities ◽  
First Time

A novel series of carboxybetaine surfactants were synthesized for the first time and their physicochemical properties were systematically investigated.

scholarly journals Impact of Esterification on Physicochemical Properties of Cellulosic Fabric using Balanites Aegyptiaca Seed Oil

2019 ◽  
pp. 1-13
Author(s):  
F. I. Omizegba ◽  
K. A. Bello ◽  
H. M. Adamu ◽  
D. E. A. Boryo ◽  
J. O. Abayeh ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Seed Oil ◽  
Toxic Chemicals ◽  
Purification Process ◽  
Balanites Aegyptiaca ◽  
Remarkable Improvement ◽  
Weft Direction ◽  
Textile Finishing ◽  
Cellulosic Fabric ◽  
First Time

This paper presents the results of some physicochemical properties of cellulosic fabric obtained by esterification using 50 cm3 of oil extracted from the seed of Balanites aegyptiaca. The oil was extracted under reflux with hexane which gave 40% yield and 0.22% moisture content. The identified cellulosic materials 10 cm and 21 cm x 2.5 cm) were subjected to purification process of scouring, bleaching and mercerization to obtain cleaner, whiter and stronger fabric that could withstand esterification treatment. The yarn crimp was 25% and 15% for warp and weft direction respectively, while the grey fabric gave the lowest of 5% and 8% for warp and weft directions. The linear density (45 tex) was recorded for the esterified fabric compared to 37 tex for the grey fabric along warp direction. The fabric sett increased from 24 thd/cm for grey to 27 thd/cm for esterified along warp direction and 16 thd/cm to 23 thd/cm along weft direction. There was an obvious reduction in shrinkage from 31 for mercerized fabric to 28 along warp direction after esterification and 21 to 19 along weft direction. The tensile parameter was 262.60 N and 166.24 N with extension of 13.92 mm and 12.23 mm along warp and weft directions respectively while the grey fabric recorded 223.87 N and 109.39 N with extensions of 3.64 mm and 3.56 mm in warp and weft direction respectively. There was a remarkable improvement in the dry and wet crease recovery angles after esterification (105º dry and 65º wet, 102º dry and 59º wet) along warp and weft direction respectively. The grey fabric gave the lowest crease recovery (50º dry and 37º wet, 45º dry and 35º wet) along warp and weft directions respectively. The esterified fabric recorded lower water absorption. The improvements in the investigated properties may be due to dimensional stability, flexibility and fineness due to esterification. This research is commendable because biodegradable organic seed oil is used to modify the physicochemical properties of cellulosic fabric for the first time. These incredible effects of the seed oil on cellulose is an immense contribution to knowledge, hence the oil is recommended for replacement of the present day toxic chemicals used in textile finishing of cellulosic fabrics.

Ag2S2O8 meets AgSO4: the second example of metal–ligand redox isomerism among inorganic systems

2016 ◽  
Vol 45 (45) ◽  
pp. 18202-18207 ◽  
Author(s):  
Tomasz E. Gilewski ◽  
Piotr J. Leszczyński ◽  
Armand Budzianowski ◽  
Zoran Mazej ◽  
Adam Grzelak ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Physicochemical Properties ◽  
Inorganic Systems ◽  
Redox Isomerism ◽  
First Time ◽  
Identical Chemical Composition ◽  
Metal Ligand

Ag(i)2S2O8 – prepared here for the first time – constitutes a redox isomer of the already known Ag(ii)SO4. These “electromers” have identical chemical composition but they differ in all important physicochemical properties.

scholarly journals A First Approach to the Chemical Composition and Antioxidant Potential of Guinea-Bissau Propolis

2019 ◽  
Vol 14 (5) ◽  
pp. 1934578X1984413 ◽  
Author(s):  
Soraia I. Falcão ◽  
Mélissa Lopes ◽  
Miguel Vilas-Boas
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Physicochemical Properties ◽  
Natural Product ◽  
Broad Spectrum ◽  
Biological Activities ◽  
Chemical Diversity ◽  
Antioxidant Potential ◽  
Phenolic Composition ◽  
First Time

Propolis is a natural product derived from plant resins collected by honeybees and used in the beehive as a construction and defensive material. The broad spectrum of biological activities is dependent on the chemical diversity of its composition which is determined by the floral sources at the site of collection. For the first time, the chemical composition of Guinean propolis as well as its physicochemical properties, phenolic composition, and antioxidant activity was assessed. Eight compounds were identified through LC/DAD/ESI-MS n , mostly isoflavonoids, resembling Nigerian and Brazilian red propolis from the genus Dalbergia.

Physicochemical characterization of diacyltetrol-based lipids consisting of both diacylglycerol and phospholipid headgroups

RSC Advances ◽  
2014 ◽  
Vol 4 (42) ◽  
pp. 21971-21978 ◽  
Author(s):  
Narsimha Mamidi ◽  
Sukhamoy Gorai ◽  
Bolledu Ravi ◽  
Debasis Manna
Keyword(s):  
Physicochemical Properties ◽  
Physicochemical Characterization ◽  
Anionic Lipid ◽  
Phospholipid Headgroups ◽  
First Time

Synthesis and physicochemical properties of a family of diacyltetrol-based hybrid lipids, containing both diacylglycerol and anionic lipid headgroups within the same moiety, have been reported for the first time.

Female reproductive status affecting chimney characteristics and time allocation for surface activities in Uca rosea (Tweedie, 1937) (Brachyura, Ocypodidae)

Crustaceana ◽  
2017 ◽  
Vol 90 (13) ◽  
pp. 1605-1613 ◽  
Author(s):  
Fahmida Wazed Tina ◽  
Mullica Jaroensutasinee ◽  
Krisanadej Jaroensutasinee ◽  
Kanitta Keeratipattarakarn
Keyword(s):  
Time Allocation ◽  
Feeding Rate ◽  
Reproductive Status ◽  
Surface Activities ◽  
Female Reproductive Status ◽  
First Time

We examined the effects of female reproductive status (ovigerous and non-ovigerous) on chimney characteristics and time allocation for surface activities in Uca rosea (Tweedie, 1937) (currently referred to as Tubuca rosea (Tweedie, 1937)). We investigated time spent on feeding, standing, in burrow, surface mating, walking, grooming, and digging of 13 ovigerous and 20 non-ovigerous females of similar-size and measured the diameter, width, and height of their chimneys. Chimneys of ovigerous females were wider and higher than those of non-ovigerous females, but chimney diameters did not differ. Ovigerous females spent less time on feeding and walking, but more time on standing, inside burrows, and mating than non-ovigerous females. Feeding rate/min did not differ between ovigerous and non-ovigerous females. This study reports, for the first time, that reproductive status of females affects chimney characteristics and time allocation for surface activities in U. rosea.

scholarly journals The Genetic Architecture of Larval Aggregation Behavior in Drosophila

2020 ◽  
Author(s):  
Ross M McKinney ◽  
Yehuda Ben-Shahar
Keyword(s):  
Genetic Architecture ◽  
Single Gene ◽  
Natural Populations ◽  
Genetic Network ◽  
Aggregation Behavior ◽  
Physiological Mechanisms ◽  
Genetic Components ◽  
Level Of Aggregation ◽  
First Time ◽  
Coding Snp

AbstractMany insect species exhibit basal social behaviors such as aggregation, which play important roles in their feeding and mating ecologies. However, the evolutionary, genetic, and physiological mechanisms that regulate insect aggregation remain unknown for most species. Here, we used natural populations of Drosophila melanogaster to identify the genetic architecture that drives larval aggregation feeding behavior. By using quantitative and reverse genetic approaches, we have identified a complex neurogenetic network that plays a role in regulating the decision of larvae to feed in either solitude or as a group. Results from single gene, RNAi-knockdown experiments show that several of the identified genes represent key nodes in the genetic network that determines the level of aggregation while feeding. Furthermore, we show that a single non-coding SNP in the gene CG14205, a putative acyltransferase, is associated with both decreased mRNA expression and increased aggregate formation, which suggests that it has a specific role in inhibiting aggregation behavior. Our results identify, for the first time, the genetic components which interact to regulate naturally occurring levels of aggregation in D. melanogaster larvae.

scholarly journals Physicochemical properties of new peanut (Arachis hypogaea L.) varieties

OCL ◽  
2019 ◽  
Vol 26 ◽  
pp. 19 ◽  
Author(s):  
Hamdy A. Zahran ◽  
Hesham Z. Tawfeuk
Keyword(s):  
Fatty Acids ◽  
Physicochemical Properties ◽  
Arachis Hypogaea ◽  
Oil Content ◽  
Unsaturated Fatty Acids ◽  
Saturated Fatty Acids ◽  
Dry Weight ◽  
Arachis Hypogaea L ◽  
Oil Characteristics ◽  
First Time

Peanuts (Arachis hypogaea L.) are one of the major oilseed crops of the world and are an important source of protein in many countries. In this study, some nutrients and characteristics of the seeds’ oil extracted from four peanut (Arachis hypogaea L.) varieties: Line 27r (Israel), Line 9 (Malawi), Line 4 (Brazil) and Line 18 (Israel) cultivated, for first time, in Upper Egypt were subjected to the comparative assessment with control NC variety (USA). Peanut seeds are a rich source of oil content (50.45 to 52.12 g 100 g−1 dry weight “DW”). The physicochemical properties of extracted oil were investigated in this study. The obtained data showed that the ratios of saturated fatty acids ranged from 14.24 to 17.23%, and the amounts of unsaturated fatty acids ranged from 82.77 to 85.76%. Significant variations (p ≤ 0.05) of oil content, saponification value, oleic/linoleic (O/L), and oil characteristics were found. Line 9 was found to be high in oil content, while Line 27r was said to have a high O/L ratio (3.22%) and proportion of unsaturated fatty acids (85.76%).

scholarly journals The Radiation Sterilization of Ertapenem Sodium in the Solid State

Molecules ◽  
2019 ◽  
Vol 24 (16) ◽  
pp. 2944
Author(s):  
Karolina Kilińska ◽  
Judyta Cielecka-Piontek ◽  
Robert Skibiński ◽  
Daria Szymanowska ◽  
Andrzej Miklaszewski ◽  
...  
Keyword(s):  
Solid State ◽  
Physicochemical Properties ◽  
High Performance ◽  
Degradation Products ◽  
Radiation Sterilization ◽  
Scanning Calorimetry ◽  
Beam Radiation ◽  
Promising Alternative ◽  
Ft Ir ◽  
First Time

For the first time, the influence of ionising radiation on the physicochemical properties of ertapenem in solid state was studied. During our studies, we evaluated the possibility of applying radiosterilization to obtain sterile ertapenem. Spectroscopic (Fourier Transform Infrared (FT-IR)), thermal (differential scanning calorimetry (DSC), chromatography (High-Performance Liquid Chromatography (HPLC) and HPLC-MS), and X-ray powder diffraction (XRPD) studies shown that irradiation of ertapenem with the 25 kGy, the dose required to achieve sterility, does not change the physicochemical properties of the studied compound. The antimicrobial activity of ertapenem irradiated with the dose of 25 kGy was only reduced for one species. Based on the received results, we can conclude that radiostelization is a promising alternative method of obtaining sterile ertapenem. In our studies, ertapenem was also exposed to e-beam radiation with a dose of 400 kGy. It was determined that two novel degradation products that are structurally differently to degradants formed during hydrolysis and thermolysis.

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