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Wyświetlanie 1-3 z 3
Tytuł:
Oxidation of α, Β -unsaturated alcohols by quinaldinium fluorochromate
Autorzy:
Sekar, K. G.
Periyasamy, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/411715.pdf
Data publikacji:
2012
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
utlenianie
kinetyka
alfa-beta nienasycone alkohole
α-β nienasycone alkohole
QnFC
oxidation
kinetics
alpha-beta unsaturated alcohols
α-β unsaturated alcohols
quinaldinium fluorochromate
Opis:
The kinetics of oxidation of α, Β-unsaturated alcohols (allyl alcohol, Crotyl alcohol, Cinnamyl alcohol) by quinaldinium fluorochromate has been studied in aqueous acid medium at 313 K. α, Β- unsaturated alcohols were converted to the corresponding acrolein, crotonaldehyde and cinnamaldehyde. The reaction is first order each in oxidant, substrate and H+. The decrease in di electric constant of the medium increases the rate of the reaction. Increase in ionic strength by the addition of sodium perchlorate has no effect on the rate constant. There is no polymerization with acrylonitrile. The reaction has been conducted at four different temperatures and activation parameters were calculated. From the observed kinetic results a suitable mechanism consistent with rate law has been proposed. The relative reactivity order was found to be Cinnamyl alcohol > Crotyl alcohol > Allyl alcohol.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2012, 5; 8-19
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Analysis of the Pilling Behaviour of Polyester/Cotton and Polyester/Viscose Blended Woven Fabrics
Analiza statystyczna pilingu tkanin mieszanych poliestrowo-bawełnianych i poliestrowo-wiskozowych
Autorzy:
Chandrasekaran, R.
Periyasamy, S.
Shabaridharan, K.
Powiązania:
https://bibliotekanauki.pl/articles/232033.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
pilling
polyester
viscose
cotton
blend
statistical analysis
poliester
wiskoza
bawełna
mieszanka
analiza statystyczna
Opis:
In this work, the pilling behaviour of polyester blended fabrics was studied and analysed statistically. Two different groups of blends were selected, namely polyester/cotton (P/C) and polyester/viscose blends (P/V). All the fabrics were assessed for pilling performance using ICI pill box, and two-way ANOVA was conducted to analyse the effect of the number of revolutions and type of fibres on the pilling behaviour of the fabrics. The analysis was further narrowed down by conducting a series of ANOVA, by segregating the number of revolutions into two stages and blend proportions into three stages for group I fabrics. Similarly for group II fabrics, both the, number of revolutions and blend proportions were segregated into two stages each. It was found that the type of component fibre used to produce the fabric loses its significance as the number of revolutions increases.
W pracy zbadano statystycznie przebieg pilingu tkanin mieszanych. Wybrano dwie różne grupy mieszanek, a mianowicie: poliester/bawełna (P/C) i poliester/wiskoza (P/V). Wszystkie tkaniny oceniono pod względem mechacenia za pomocą ICI i przeprowadzono dwukierunkową analizę ANOVA w celu przeanalizowania wpływu liczby obrotów i rodzaju włókien na piling tkanin. Analizę dodatkowo zawężono, przeprowadzając serię ANOVA, segregując liczbę obrotów na dwa etapy i mieszając proporcje na trzy etapy dla tkanin z grupy I. Podobnie w przypadku tkanin z grupy II, zarówno liczba obrotów, jak i proporcje mieszanek podzielono na dwa etapy. Stwierdzono, że rodzaj włókna składowego użytego do wytworzenia tkaniny traci na znaczeniu w miarę wzrostu liczby obrotów.
Źródło:
Fibres & Textiles in Eastern Europe; 2018, 3 (129); 66-70
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immune response of shrimp Peneaus monodon against Vibrio parahaemolyticus
Autorzy:
Muthaiyan, Rajikkannu
Krishnan, S.
Periyasamy, Selvakumar
Chetri, Zhievino
Nandakumar, R.
Powiązania:
https://bibliotekanauki.pl/articles/1031867.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
NBT activity and Pathogenesis
Penaeus monodon
V. parahaemolyticus
Opis:
The study was carried out on impact of vibriosis by using Vibrio parahaemolyticus in Peneaus monodon Fabricius, 1798, collected from Nagapattinam. The impact was studied on heamatological and biochemical parameters. Feeds were prepared by coating probiotic strains of B. firmus and B. coagulans. Laboratory investigations were carried out concerning impact of pathogenic Vibrio parahaemolyticus of total count, differential count, Nitroblue tetrazolium activity, Prophenoloxidase activity and bacterial clearance in P. monodon. Total heamocyte was enumerated in vibriosis by induced shrimps, all results showing an increase in total haemocyte count after the time of infection. After feeding, the total heamocyte count was 1442 cells/cu·mm in control animals, in B. coagulans supplemented animals 2757 cells/cu.mm and in B. firmus was 2448 cell/cu·mm. After feed supplementation the shrimps were infected with V. parahaemolyticus and their impact on total haemocyte count was assessed in all three groups. In control, the total haemocyte count was increased with 2560 cells/cu·mm, whereas in B. coagulansis 5126 cells/cu·mm, and in B. firmusis 4697cells/cu·mm. Two-way Analysis of Variance for total haemocyte count in normal and infected haemolymph showed a significant variation. The control samples recorded the lowest, and after infection B. coagulans supplemented animals recorded maximum counts among three groups. Differential count was evaluated by studying the three types of cells. There was not much variation in the percentage of cells, but a slight decrease was observed in the hyaline cells after 24 hours of infection. The NBT activity was 1.4 (NBT activity) in control animals, 2.7 in B. coagulans and 2.4 in B. firmus supplemented animals. Maximum reduction was observed in control animals with 0.92, 1.7 in B. coagulans and 1.4 in B. firmus supplemented animals. There was an initial spurt of vibrios when cultured in selective medium TCBS in all three treatments and gradual decrease in the vibrios count during 24 hours observation.
Źródło:
World News of Natural Sciences; 2020, 30, 2; 150-168
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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