scholarly journals A Study of Zooplankton Community in Dukan Lake, Kurdistan Region-Iraq, with a New Record of Craspedacusta sowerbii Lankester (1880) Medusa (Cnidaria: Hydrozoa)

2017 ◽  
Vol 14 (4) ◽  
pp. 735-741 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Similarity Index ◽  
Chemical Properties ◽  
Zooplankton Community ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Alkaline Side ◽  
Physical And Chemical ◽  
First Time ◽  
Jaccard's Similarity Index ◽  
And Chemical Properties

A study of Zooplankton community has been carried out at four selected sites on Dukan Lake. Samples of water and zooplankton were collected monthly for the period from July 2015 to February 2016. Some physical and chemical properties of water were studied and the results showed that the air temperature were ranged from 0 to 36.16 °C, water temperature ranged from 2.83 to 34.66 °C, hydrogen ion concentration of studied sites were found to lie in alkaline side, it was ranged between 6.87 to 8.57, electrical conductivity ranged from 190.79 to 850.08 µs.cm­¹, turbidity ranged from 0.9-7.7 NTU, and dissolved oxygen from 3.3 to 6.8 mg.l-¹ while BOD5 were ranged from 0.53 to 34.66 mg.l-¹. Concerning to the zooplankton, 37 species were identified which belonged to Cladocera (48.38%), Copepod (43.28%), Rotifera (8.23%), Targigrada (0.08%) and Cnidaria (0.1%). The medusa of Craspedacusta sowerbii Lankester (1880) was recorded for the first time in Iraq. Regarding to zooplankton community, rotifer were ranged between 0 to 690.91 ind.m-3, Copepoda from 54.55 to 5927.27 ind.m-3 and Cladocera ranged from 18.18 to 6072.73 ind.m-3. According to Shanon-Weiner index, species diversity for zooplankton invertebrates was ranged from 0.325 to 1.091 bits/ind. Jaccard’s similarity index showed that the highest similarity was recorded between site (1) and site (4) with 40.74%.

Sila-Pharmaka, 9. Mitt. [1] Darstellung und Eigenschaften potentiell curarewirksamer Silicium-Verbindungen, I / Sila-Drugs, 9th Communication [1] Preparation and Properties of Silicon Compounds with Potential Curare-Like Activity, I

1978 ◽  
Vol 33 (4) ◽  
pp. 412-416 ◽  
Author(s):  
Reinhold Tacke ◽  
Roland Niedner
Keyword(s):  
Mass Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Organosilicon Compounds ◽  
Silicon Compounds ◽  
H Nmr ◽  
Toxicological Data ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

Abstract Organosilicon compounds 8, 9 and 10 with potential curare-like action and their precursors 5, 6 and 7 were synthesized for the first time. 5−10 were characterized by their physical and chemical properties, and their structures were confirmed by analyses, 1 H NMR and mass spectroscopy (only for 5−7). The pharmacological and toxicological data of 8, 9 and 10 are reported.

scholarly journals STUDY OF COMPOSITION, PHYSICAL AND CHEMICAL PROPERTIES AND BIOLOGICAL ACTIVITY OF POLYSACCHARIDE COMPLEX OF ARCTIUM LAPPA LEAVES

2017 ◽  
Vol 25 (1) ◽  
pp. 42-48
Author(s):  
I A. Sychev ◽  
D G. Kokina
Keyword(s):  
Chemical Properties ◽  
Erythrocyte Membranes ◽  
Physical And Chemical Properties ◽  
Qualitative Composition ◽  
Arctium Lappa ◽  
Polysaccharide Complex ◽  
Healthy Donors ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

A method of isolation of polysaccharide complex from the leaves of Burdock (Arctium lappa L.) is described in the article. For the first time the qualitative composition of this complex was determined, belonging to the group of heteroglycans. Some of physical and chemical properties of polysaccharide complex were studied. It is shown that polysaccharide complex increases catalase activity and peroxide resistance of the erythrocyte membranes of healthy donors. The study found that polysaccharide complex of Burdock improves physical performance of test animals.

THE BLOOM AND TOXICITY OF CYANOBACTERIA IN LAKE SEVAN

2020 ◽  
Vol 54 (2 (252)) ◽  
pp. 168-176
Author(s):  
L.R. Hambaryan ◽  
L.G. Stepanyan ◽  
M.V. Mikaelyan ◽  
Q.G. Gyurjyan
Keyword(s):  
Algal Blooms ◽  
Littoral Zone ◽  
Algal Bloom ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Lake Sevan ◽  
Phosphate Ions ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

Seasonal hydrochemical, hydrophysical, and phytoplankton studies were conducted in a littoral zone of Lake Sevan in 2019. It is known that in recent years widespread algal blooms were usually started from the littoral zone of Big Sevan, and then spread towards the pelagic zone of the lake. The bloom was mainly caused by species belonging to the genus Dolichospermum (previously Anabaena). Our study has revealed that the physical and chemical properties of water were changed as a result of algal bloom. Particularly, the transparency of water and concentration of dissolved oxygen decreased, while the concentrations of ammonium, nitrite and phosphate ions increased. For the first time, the presence of the toxins microcystin and anatoxin-a was recorded in the lake.

scholarly journals Rice husk derived Aminated Silica for the efficient adsorption of different gases

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Rashed S. Bakdash ◽  
Isam. H. Aljundi ◽  
Chanbasha Basheer ◽  
Ismail Abdulazeez
Keyword(s):  
Rice Husk ◽  
Energy Gap ◽  
Chemical Properties ◽  
Separation Capacity ◽  
Physical And Chemical ◽  
First Time ◽  
Different Gases ◽  
Homo Lumo ◽  
Consequent Increase ◽  
And Chemical Properties

Abstract In this present work, we successfully prepared aminated silica (ASiO2) from rice husk ash (RHA) and functionalized with 3-aminopropyltriethoxysilane (APTES). Physical and chemical properties of the synthesized material were investigated by various techniques SEM–EDX, XPS, FTIR, TGA. The surface area of RHA was 223 m2/g, while for ASiO2 was 101 m2/g. Molecular level DFT calculations revealed that the functionalization of ASiO2 resulted in a significant decrease in the HOMO–LUMO energy gap, a reduction in hardness, and a consequent increase in charge transfer characteristics. The adsorption behavior at low pressure (1 atm.) of aminated silica on different gases CO2, CH4, H2, and N2 at temperatures 77, 273, 298 K was studied. The adsorption of hydrogen was reported for the first time on aminated silica with an excellent adsorption capacity of 1.2 mmol/g. The ASiO2 exhibited excellent performance in terms of gas separation in binary mixtures of CO2/CH4, CO2/N2 and CO2/H2 at 273, and 298 K, respectively. The catalyst further exhibits high stability during three cycles with less than 10% variation in the separation capacity.

NEW CONSIDERATIONS IN ORGANOGERMANIUM-SULPHUR CHEMISTRY

1963 ◽  
Vol 41 (5) ◽  
pp. 1276-1280 ◽  
Author(s):  
Malcolm C. Henry ◽  
Wenzel E. Davidson
Keyword(s):  
Chemical Properties ◽  
Group Iv ◽  
Physical And Chemical Properties ◽  
Sulphur Compounds ◽  
New Compounds ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

The successful synthesis of sodium triphenylgermanethiol (1), (C6H5)3GeSNa, and disodium diphenylgermanedithiol, (C6H5)2Ge(SNa)2, have made it possible to carry out reactions with RX type compounds yielding a variety of organogermanium-sulphur compounds. In addition, triphenylgermanethiol, (C6H5)3GeSH, has been synthesized for the first time. Reactions of these compounds are related to analogous group IV element compounds. Physical and chemical properties of these new compounds are also discussed.

scholarly journals Anatomical characterization, physical, and chemical properties of wood of Quercus macdougallii Martínez, endemic species of the Sierra Juárez of Oaxaca, Mexico

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5975-5998
Author(s):  
Faustino Ruiz-Aquino ◽  
Lizbeth Luna-Bautista ◽  
Aremi E. Luna-Bautista ◽  
Wenceslao Santiago-García ◽  
Luis F. Pintor-Ibarra ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Physical Properties ◽  
Endemic Species ◽  
Basic Density ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Cellulose Pulp ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

The anatomical characteristics and the physical and chemical properties of wood of Quercus macdougallii Martínez are presented for the first time. Q. macdougallii Martínez is an endemic species of the Sierra Juarez of Oaxaca. The microscopic characteristics were described in preparations of typical cuts and dissociated material. The physical properties were evaluated according to the ASTM D 143-94 standard in sapwood and heartwood specimens. The measurable elements and physical properties were classified according to the mean. With the measurable elements, the paper pulp quality index was determined. In sapwood and heartwood, the basic chemical composition was determined. The wood of Q. macdougallii presented a pronounced grain, a thick texture, and a straight thread. Fibers, fibrotracheids, uniseriate, multiseriate, and aggregate rays were found. Basic density 0.55 g cm-3 in sapwood and 0.61 g cm-3 in heartwood is classified as moderately heavy and heavy, respectively. The saturation point of the fiber is classified as high. Based on its physical properties, Q. macdougallii wood can be used in the manufacture of furniture, veneer, floors, tool handles, and construction. Based on the pulp quality indices and chemical composition, this wood could be used to obtain cellulose pulp for paper.

ENZYMES OF MARINE ALGAE: II. ISOLATION AND IDENTIFICATION OF 3-HYDROXYTYRAMINE AS THE PHENOLASE SUBSTRATE IN MONOSTROMA FUSCUM

1966 ◽  
Vol 44 (5) ◽  
pp. 605-608 ◽  
Author(s):  
R. D. Tocher ◽  
J. S. Craigie
Keyword(s):  
Green Alga ◽  
Marine Algae ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Natural Substrate ◽  
Fresh Weight ◽  
Isolation And Identification ◽  
Physical And Chemical ◽  
First Time ◽  
And Chemical Properties

3-Hydroxytyramine (dopamine; 3, 4-dihydroxyphenylethylamine) is reported for the first time as an algal constituent. It was isolated and crystallized in approximately 0.3% of the fresh weight of the green alga, Monostroma fuscum. The identity was established by the comparison of its physical and chemical properties with those of an authentic specimen. 3-Hydroxytyramine is the principal phenol and the natural substrate for phenolase in this organism.

Sila-Pharmaka, 16. Mitt. [1]. Sila-Analoga von Nifedipin-ähnlichen 4-Aryl-2.6-dimethyl-1.4-dihydropyridin-3.5-dicarbonsäure-dialkylestern, I. / Sila-Drugs, 16th Communication [1]. Sila-Analogues of Nifedipine-Like Dialkyl 4-Aryl-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylates, I.

1980 ◽  
Vol 35 (4) ◽  
pp. 494-501 ◽  
Author(s):  
R. Tacke ◽  
A. Bentlage ◽  
R. Towart ◽  
H. Meyer ◽  
F. Bossert ◽  
...  
Keyword(s):  
Mass Spectroscopy ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
H Nmr ◽  
Physical And Chemical ◽  
Antihypertensive Properties ◽  
First Time ◽  
And Chemical Properties

The nifedipine-like 1,4-dihydropyridines 10a and 11a as well as their sila-analogues 10b, 10c, and 11b were synthesized for the first time. 10a, 10b, 10c, 11 a , 11b , and their precursors 8a, 8b, 9a, and 9b were characterized by their physical and chemical properties, and their structures confirmed by analyses, 1H NMR and mass spectroscopy. The antispasmodic, vasodilating, and antihypertensive properties of 10a, 10b, 10c, 11a, and 11b were compared.

scholarly journals Spider silk of Linothele fallax and Linothele megatheloides (Mygalomorphae, Dipluridae) does not affect the growth of bacteria

Biologia ◽  
2020 ◽  
Vol 75 (10) ◽  
pp. 1679-1683 ◽  
Author(s):  
Paweł Szymkowiak ◽  
Maryia Tsiareshyna ◽  
Ryszard Koczura
Keyword(s):  
Spider Silk ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Chemical Properties ◽  
Nerve Grafts ◽  
Mueller Hinton ◽  
Physical And Chemical ◽  
First Time ◽  
Mueller Hinton Broth ◽  
And Chemical Properties

Abstract Due to physical and chemical properties as well as biocompatibility, spider silk has a great potential for use in medicine and biotechnology. It is applicable in the regeneration of the skin and nerve grafts. In this work, antibacterial property of spider silk was investigated. This feature would be especially useful for the application of spider threads in medicine. Silk of the spiders Linothele fallax (Mello-Leitão, 1926) and Linothele megatheloides Paz & Raven, 1990 was tested on Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Enterococcus faecalis. Prior to inoculation, thesilk was weighed, sterilized with hydrogen peroxide and the effect of the silk on bacteria was tested in Mueller-Hinton broth. A lack of antibacterial properties of the silk of L. fallax and L. megatheloides was observed. The results on antimicrobial properties of silk of mygalomorph spiders are published for the first time.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

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