Cleavage of carbohydrate-peptide linkage by hydrolases of achlamydate slug Arion subfuscus

1965 ◽  
Vol 14 (10) ◽  
pp. 1883-1883
Author(s):  
E. D. Kaverzneva
Keyword(s):  
Peptide Linkage ◽  
Arion Subfuscus

scholarly journals The nature of the carbohydrate-peptide linkage region in glycoproteins from the cellulosomes of Clostridium thermocellum and Bacteroides cellulosolvens.

1993 ◽  
Vol 268 (36) ◽  
pp. 26956-26960
Author(s):  
G J Gerwig ◽  
J P Kamerling ◽  
J F Vliegenthart ◽  
E Morag ◽  
R Lamed ◽  
...  
Keyword(s):  
Clostridium Thermocellum ◽  
Linkage Region ◽  
Peptide Linkage

Interaction of hydrated electrons with the peptide linkage

1974 ◽  
Vol 78 (12) ◽  
pp. 1193-1196 ◽  
Author(s):  
P. S. Rao ◽  
E. Hayon
Keyword(s):  
Peptide Linkage ◽  
Hydrated Electrons

THE EFFECT OF LOW TEMPERATURE ON THE ASCORBIC ACID CONTENT OF THE OVOTESTIS OF THE SLUG, ARION SUBFUSCUS (DRAPARNAUD)

1957 ◽  
Vol 35 (5) ◽  
pp. 609-613
Author(s):  
D. Pelluet
Keyword(s):  
Ascorbic Acid ◽  
Low Temperature ◽  
Acid Content ◽  
Ascorbic Acid Content ◽  
Arion Subfuscus ◽  
Initial Decrease

The amount of ascorbic acid in the slug Arion subfuscus has been estimated quantitatively at laboratory temperatures and at 0°–2 °C. The results show that the effect of the exposure to the low temperature reduces the amount-present in the ovotestis significantly. In general, the amount of ascorbic acid in the cold treated animals does not exceed that of the controls. This result does not agree with the cytological appearance of the ovotestis exposed to the same conditions, in which the cold treated animals show an increased number of granules of ascorbic acid after an initial decrease.

Structural Studies on N-(2,4,6-Trimethylphenyl)-methyl/ chloro-acetamides, 2,4,6-(CH3)3C6H2NH-CO-CH3–yXy (X = CH3 or Cl and y = 0, 1, 2)

2006 ◽  
Vol 61 (10-11) ◽  
pp. 588-594 ◽  
Author(s):  
Basavalinganadoddy Thimme Gowda ◽  
Jozef Kožíšek ◽  
Hartmut Fuess
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Structural Data ◽  
The Other ◽  
Side Chain ◽  
Structural Studies ◽  
Asymmetric Unit ◽  
Lattice Constants ◽  
Peptide Linkage ◽  
The Mean

TMPAThe effect of substitutions in the ring and in the side chain on the crystal structure of N- (2,4,6-trimethylphenyl)-methyl/chloro-acetamides of the configuration 2,4,6-(CH3)3C6H2NH-COCH3− yXy (X = CH3 or Cl and y = 0,1, 2) has been studied by determining the crystal structures of N-(2,4,6-trimethylphenyl)-acetamide, 2,4,6-(CH3)3C6H2NH-CO-CH3 (); N-(2,4,6- trimethylphenyl)-2-methylacetamide, 2,4,6-(CH3)3C6H2NH-CO-CH2-CH3 (TMPMA); N-(2,4,6- trimethylphenyl)-2,2-dimethylacetamide, 2,4,6-(CH3)3C6H2NH-CO-CH(CH3)2 (TMPDMA) and N-(2,4,6-trimethylphenyl)-2,2-dichloroacetamide, 2,4,6-(CH3)3C6H2NH-CO-CHCl2 (TMPDCA). The crystallographic system, space group, formula units and lattice constants in Å are: TMPA: monoclinic, Pn, Z = 2, a = 8.142(3), b = 8.469(3), c = 8.223(3), β = 113.61(2)◦; TMPMA: monoclinic, P21/n, Z = 8, a = 9.103(1), b = 15.812(2), c = 16.4787(19), α = 89.974(10)◦, β = 96.951(10)◦, γ =89.967(10)◦; TMPDMA: monoclinic, P21/c, Z = 4, a =4.757(1), b= 24.644(4), c =10.785(2), β = 99.647(17)◦; TMPDCA: triclinic, P¯1, Z = 2, a = 4.652(1), b = 11.006(1), c = 12.369(1), α = 82.521(7)◦, β = 83.09(1)◦, γ = 79.84(1)◦. The results are analyzed along with the structural data of N-phenylacetamide, C6H5NH-CO-CH3; N-(2,4,6-trimethylphenyl)-2-chloroacetamide, 2,4,6-(CH3)3C6H2NH-CO-CH2Cl; N-(2,4,6-trichlorophenyl)-acetamide, 2,4,6-Cl3C6H2NH-COCH3; N-(2,4,6-trichlorophenyl)-2-chloroacetamide, 2,4,6-Cl3C6H2NH-CO-CH2Cl; N-(2,4,6-trichlorophenyl)- 2,2-dichloroacetamide, 2,4,6-Cl3C6H2NH-CO-CHCl2 and N-(2,4,6-trichlorophenyl)- 2,2,2-trichloroacetamide, 2,4,6-Cl3C6H2NH-CO-CCl3. TMPA, TMPMA and TMPDCA have one molecule each in their asymmetric units, while TMPDMA has two molecules in its asymmetric unit. Changes in the mean ring distances are smaller on substitution as the effect has to be transmitted through the peptide linkage. The comparison of the other bond parameters reveal that there are significant changes in them on substitution.

Postdispersal Predation of Velvetleaf (Abutilon theophrasti) Seeds

Weed Science ◽  
1996 ◽  
Vol 44 (3) ◽  
pp. 534-539 ◽  
Author(s):  
John Cardina ◽  
Heather M. Norquay ◽  
Benjamin R. Stinner ◽  
David A. McCartney
Keyword(s):  
Late Summer ◽  
Soil Surface ◽  
Predation Rate ◽  
Agrotis Ipsilon ◽  
Seed Density ◽  
No Tillage ◽  
Decay Function ◽  
Seed Loss ◽  
Arion Subfuscus ◽  
Moldboard Plow

Studies were conducted from 1989 to 1993 in continuous no-tillage and moldboard plow corn fields to describe rates of velvetleaf seed predation with time and with seed density, and to identify principal seed predators. Rates of seed loss from the soil surface averaged 1 to 57% day−1and were equivalent in the two tillage systems. Predator populations were the same in no-tillage and moldboard plow fields. The predation rate was generally low in winter months, increased in mid-summer, and declined in late summer. In 2 of the 4 yr, predation increased in October and November. The predation rate was described by an exponential decay function of seed density, with high rates of seed loss at low densities and leveling off to a nearly constant level at densities above 600 seeds m−2. Predation was highest where seed access was not restricted, and exclosures of 6.5 and 1.6 cm2reduced predation up to 15 and 52%, respectively. Mice were important predators in the field. In laboratory feeding studies, the carabid beetleAmara cupreolata, the slugsArion subfuscusandDeroceras reticulatum, and cutworms (Agrotis ipsilon) consumed imbibed velvetleaf seeds.Amara cupreolataand A.subfuscuswere the only predators to damage unimbibed velvetleaf seeds.

scholarly journals Elasticity and energy dissipation in the double network hydrogel adhesive of the slug Arion subfuscus

2019 ◽  
Vol 374 (1784) ◽  
pp. 20190201 ◽  
Author(s):  
T.-M. Fung ◽  
C. Gallego Lazo ◽  
A. M. Smith
Keyword(s):  
Energy Dissipation ◽  
Time Course ◽  
Tensile Tests ◽  
Cyclic Stress ◽  
Mechanical Tests ◽  
Double Network ◽  
Ph Values ◽  
Arion Subfuscus ◽  
Synthetic Adhesives ◽  
Cross Links

The slug Arion subfuscus produces a mucus-based defensive secretion that is remarkably tough. This glue appears to be a double network hydrogel, gaining its toughness through the synergistic actions of two networks of polymers, a relatively stiff network and a relatively deformable network. The double network mechanism has great potential to guide the development of synthetic adhesives. Mechanical tests were performed to analyse key predictions of the mechanism. Stress relaxation tests and tensile tests support the presence of stable cross-links. Cyclic stress–strain tests demonstrate that the glue dissipates a great deal of energy through the failure of these cross-links as sacrificial bonds. Energy dissipation by failure of sacrificial bonds rather than viscous processes is supported by the minimal effect of the time course of the experiments on the measured properties. These sacrificial bonds appear able to reform within minutes after failure. Finally, the glue's stiffness decreases at pH values below 5.5, whereas magnesium and calcium rapidly dissociate from the glue at all pH values tested. Thus, these ions may not be the primary cross-linkers generating the glue's stiffness. This article is part of the theme issue ‘Transdisciplinary approaches to the study of adhesion and adhesives in biological systems’.

FROM OZONE TO THE PEPTIDE LINKAGE

1971 ◽  
pp. 201-204
Author(s):  
S.P. McGlynn ◽  
H.J. Maria ◽  
D. Larson ◽  
C.J. Seliskar
Keyword(s):  
Peptide Linkage
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