scholarly journals Self-assemblies of lecithin and α-tocopherol as gelators of lipid material

RSC Advances ◽  
2014 ◽  
Vol 4 (5) ◽  
pp. 2466-2473 ◽  
Author(s):  
Constantinos V. Nikiforidis ◽  
Elke Scholten
Keyword(s):  
Lipid Material

CONVERSION OF PROTHROMBIN TO AUTOPROTHROMBIN II

1956 ◽  
Vol 34 (6) ◽  
pp. 1199-1209 ◽  
Author(s):  
John A. Penner ◽  
F. Duckert ◽  
Shirley A. Johnson ◽  
Walter H. Seegers
Keyword(s):  
Absorption Spectrum ◽  
Calcium Ions ◽  
Infrared Absorption Spectrum ◽  
Heterogeneous Mixture ◽  
Absorption Bands ◽  
Platelet Factor ◽  
Lipid Material ◽  
Single Substance ◽  
Absorption Pattern ◽  
Generation Test

With thromboplastin, Ac-globulin, and calcium ions, purified prothrombin converts to biothrombin. This derivative of prothrombin is also obtained with purified platelet factor 3, Ac-globulin, calcium ions, and autoprothrombin II. Need for the latter substance by platelet factor 3 is one marked distinction that can be made between thromboplastin and platelet factor 3. Thromboplastin does not require a cofactor such as platelet cofactor I or autoprothrombin II. Ether extracts of dry brain or of purified platelet factor 3 or of whole platelets yield lipid material. The lipids obtained in this manner are active in a modified Biggs and Douglas thromboplastin generation test; but in contrast to the original thromboplastin or purified platelet factor 3 from which they are obtained do not activate purified prothrombin to thrombin. The lipid material is thus distinctly different from thromboplastin or from platelet factor 3. The lipid is also active in the conversion of prothrombin to autoprothrombin II when purified prothrombin is the substrate or when the prothrombin is in the original plasma or whole blood. Extraction of purified platelet factor 3 leaves a protein residue and it is believed that platelet factor 3 is a lipoprotein. The infrared absorption spectrum of the lipid obtained from purified platelet factor 3 shows strong absorption bands. From the general absorption pattern, we infer that the lipid is not a heterogeneous mixture, but most likely a single substance or consists of several that are nearly alike. Platelet factor 3 lipid(s) is most likely a cephalin-like compound.

scholarly journals Loss of lipid material during the dehulling of oilseeds with different structural characteristics

2015 ◽  
Vol 52 (12) ◽  
pp. 7934-7943 ◽  
Author(s):  
A. K. de Figueiredo ◽  
L. M. Rodríguez ◽  
M. Fernández ◽  
I. C. Riccobene ◽  
S. M. Nolasco
Keyword(s):  
Structural Characteristics ◽  
Lipid Material

scholarly journals Studies of the loss of viability of bacterial aerosols: III. Factors affecting death rates of certain non-pathogens

1958 ◽  
Vol 56 (3) ◽  
pp. 389-403 ◽  
Author(s):  
Ronald M. Ferry ◽  
William F. Brown ◽  
Edwin B. Damon
Keyword(s):  
Petroleum Ether ◽  
Chemical Structure ◽  
Ambient Medium ◽  
Death Rates ◽  
Factors Affecting ◽  
Lipid Material ◽  
Quantitative Studies ◽  
Bacterial Aerosols ◽  
Micro Organisms ◽  
Physical And Chemical

1. Additional quantitative studies of the survival of micro-organisms in aerosols are reported.2. Substitution of nitrogen for oxygen in the ambient medium decreases k′2, the rate of secondary loss of viability ofM. candidus, Esch. coliandS. marcescens, by 30–50%.3. The rate of primary decay (k′1) ofEsch. colidoes not appear to be affected by a similar change of atmosphere.4. The rate of secondary decay, k′2, ofM. candidusappears to increase two-to three-fold for 10°C. increments in temperature.5. Treatment of suspensions ofEsch. coliwith petroleum ether alone or containing lipid material increases k′1in aerosols generated from such suspensions.6. Treatment ofMyco. phleiwith petroleum ether appears to lower resistance to subsequent sonic irradiation.These observations are consistent with the hypothesis that differences in the physical and chemical structure of micro-organisms are reflected in constants k′1, k′2and b.We gratefully acknowledge the effective interest of two former assistants, T. Grant Maple and Eugene Mills, as well as the careful, effective, and conscientious work of our technical assistants, Ann Barr, Nora Galins, Cynthia Hartwig, Grace C. Leigh, Elizabeth Neidhardt, Paulette Slaney and Martha Szerslip, who have at different times helped secure the data presented here. Mrs Joseph J. Ecker deserves special thanks for care in the preparation of the manuscript.

STEROIDS AND OTHER LIPIDS OF PREGNANT COW'S URINE

1959 ◽  
Vol 18 (1) ◽  
pp. 32-45 ◽  
Author(s):  
W. KLYNE ◽  
A. A. WRIGHT
Keyword(s):  
Phenolic Fraction ◽  
Human Pregnancy ◽  
Lipid Material ◽  
Urinary Steroids ◽  
Pregnancy Urine ◽  
The Common ◽  
Steroid Excretion

SUMMARY 1. Pregnant cow's urine was hydrolysed with acid, and the lipid material obtained was submitted to the fractionation procedures customary in the study of urinary steroids. 2. Oestrone (0·3 mg/1.) and oestradiol-17α (0·1 mg/1.) were isolated from the phenolic fraction. Oestradiol-17β could not be detected. 3. The heterocyclic phenol equol isoflavan-7:4′-diol) was also isolated (6 mg/1.). 4. The neutral non-ketonic fraction contained 5β-androstane-3α: 17α-diol (0·2 mg/1.) and 5α-androstane-3β:17α-diol. A very small quantity of material resembling 5β-pregnane-3α:20α-diol (the common 'pregnanediol' of human pregnancy urine) was isolated but not satisfactorily identified. 5. The volatile part of this fraction contained two tetrahydroionanediols A and B. 6. The neutral non-volatile ketonic fraction was small (0·6 mg/1.). Three α-17-oxosteroids were tentatively identified. 7. The results are discussed in relation to the routes of steroid excretion in cows, and in relation to the determination of steroids in animal urines.

The Lipids of Sea-Urchin Semen

1953 ◽  
Vol 30 (4) ◽  
pp. 561-566
Author(s):  
A. CARDIN ◽  
M. L. MEARA
Keyword(s):  
Fatty Acids ◽  
Free Fatty Acids ◽  
Sea Urchin ◽  
Marine Animal ◽  
Animal Fat ◽  
Lipid Material ◽  
Phosphorus Containing ◽  
Unsaponifiable Material

1. The specimen of sea-urchin semen examined contained 0.95% lipid material consisting of 13.6% neutral fat, 32.9% free fatty acids, 26.0% phospholipids, 9.2% sterols and 18.3% other unsaponifiable material. 2. The component fatty acids of the non-phosphorus-containing lipids have been computed to be: palmitic 10.1, unsaturated C16 2.1 (-3.0), C18 30.4 (-4.9), C20 45.1 (-7.0), C22 12.3 (-6.5)%, w/w, this being a composition which can be regarded as typical of a marine animal fat. 3. The N : P ratio of the phospholipids indicated the presence of mono- and diaminophosphatides and possibly the presence of non-phosphorus-containing lipoproteins. 4. Adequate reserves of non-phosphorus-containing lipids are present in the spermatozoa, in addition to phospholipids to serve as a source of energy required for movement.

Influence of thionin on the structure of a bilayer and on the intermembrane exchange of lipid material

1994 ◽  
Vol 30 (1) ◽  
pp. 68-72
Author(s):  
S. O. Kolusheva ◽  
B. A. Salakhutdinov ◽  
T. F. Aripov ◽  
L. P. Vernon
Keyword(s):  
Lipid Material

A Lipid Material in Bone and Teeth in Experimental Chronic Fluorosis

Nature ◽  
1957 ◽  
Vol 180 (4592) ◽  
pp. 926-926 ◽  
Author(s):  
GERTRUD LINDEMANN
Keyword(s):  
Lipid Material ◽  
Chronic Fluorosis

The Lipid Composition of Rabies Virus

1973 ◽  
Vol 28 (1-2) ◽  
pp. 90-93 ◽  
Author(s):  
H. Diringers ◽  
H.-P. Kulas ◽  
L. G. Schneider ◽  
H. D. Schlumberger
Keyword(s):  
Neutral Lipid ◽  
Host Cell ◽  
Rabies Virus ◽  
Polar Lipid ◽  
Lipid Composition ◽  
Polar Lipids ◽  
Molar Ratio ◽  
Virus Preparation ◽  
Lipid Material

The lipid composition of the Flury HEP strain of rabies virus grown in BHK 21/C 13 cells was determined. The dried purified virus preparation contains 5.5 % neutral and 19.5 % polar lipids. Cholesterol was found to be the major neutral lipid. Phopholipids constitute 11.2 %; and glycolipids represent 4.6 % of the virus mass. The residual 3.7 % of extracted polar lipid material could not be accounted for by any known lipids. Phosphatidylethanolamine, phosphatidylcholine and sphingomyelin are the main constituents of the viral phospholipids. Hema- toside is the only ganglioside and the main glycolipid present in the virus. The glycolipids of the host cell and the virus are identical. The molar ratio of sphingolipids to glycerophospho-lipids is 0.8.

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