scholarly journals Isolation and characterization of an endo-β-galactosidase from Bacteroides fragilis

1983 ◽  
Vol 213 (2) ◽  
pp. 485-494 ◽  
Author(s):  
P Scudder ◽  
K Uemura ◽  
J Dolby ◽  
M N Fukuda ◽  
T Feizi
Keyword(s):  
Bacteroides Fragilis ◽  
High Yield ◽  
Keratan Sulphate ◽  
Common Structure ◽  
Isolation And Characterization ◽  
The Common ◽  
Beta Galactosidase

Six strains of Bacteroides fragilis were examined and all found to produce endo-beta-galactosidase, an enzyme that hydrolyses internal β-galactosidic linkages of oligosaccharides belonging to the poly-N-acetyl-lactosamine series, with the common structure GlcNAc β 1 leads to 3Gal β 1 leads to 4GlcNAc/Glc. The enzyme was produced without the addition of an inducer such as keratan sulphate. It was purified 7000-fold from the culture supernatant and obtained with a yield 4-10-fold greater than from sources described previously. The specificity of the enzyme towards bovine corneal keratan sulphate, milk oligosaccharides and the glycolipids lacto-N-neotetraosylceramide and lacto-N-tetraosylceramide closely resembled that of the endo-beta-galactosidase isolated from Escherichia freundii. A novel observation was that both enzymes hydrolysed the type 2 sequence, Gal β 1 leads to 4GlcNAc β 1 leads to 3Gal β 1 leads to 4Glc, at about twice the rate of the type 1 isomer, Gal β 1 leads to 3GlcNAc β 1 leads to 3Gal β 1 leads to 4Glc. Because of the ease of purification of the enzyme and high yield in the absence of contaminating glycosidases and proteinases, Bacteroides fragilis is a valuable source of endo-beta-galactosidase for the structural analysis of carbohydrate chains.

scholarly journals Isolation and characterization of sulphated oligosaccharides released from bovine corneal keratan sulphate by the action of endo-beta-galactosidase

1986 ◽  
Vol 157 (2) ◽  
pp. 365-373 ◽  
Author(s):  
Peter SCUDDER ◽  
Ping W. TANG ◽  
Elizabeth F. HOUNSELL ◽  
Huseyin MEHMET ◽  
Ten FEIZI ◽  
...  
Keyword(s):  
Keratan Sulphate ◽  
Isolation And Characterization ◽  
Beta Galactosidase

Isolation and characterization of oleochemical compounds from watermelon seed

2020 ◽  
Vol 10 (4) ◽  
pp. 79-82
Author(s):  
Madhubhushan M ◽  
Seshaiah S ◽  
Chandrudu J ◽  
Sagar R ◽  
Akila CR
Keyword(s):  
Cutting Tool ◽  
Citrullus Lanatus ◽  
Fatty Esters ◽  
Mineral Oils ◽  
Light Yellow ◽  
Isolation And Characterization ◽  
The Common ◽  
Set Up ◽  
Natural Gradation

The common watermelon item (Citrullus lanatus) seeds were gained from castoffs verdant nourishments for use by decorating, sun ventilation and pulverizing. Light yellow-toned oil was gotten by dissolvable withdrawal using oil atmosphere and the going with traits were gotten using oil ether: pH, refractive rundown, thickness, dissolvable miscibility, coagulating temperature, fire nature, express gravity, streak point and warmth of consuming. With a shallow level of unsaturation, stepped level of smoothness, and proximity of raised degree of the sensible proportion of free unsaturated fats. The low assessment of the solidifying temperature of the oil offered a hint that the oil can be managed in various areas paying little heed to the qualification in temperature. The following level of linoleic destructive of the oil offers a hint of natural gradation of solidarity. Fatty esters are increasing expanding significance as a biodegradable swap for mineral oils. In some request regions, for example, cutting tool oil, gearbox, pressure-driven oils, and greases for raw petroleum creation, the oleochemical items are set up. Nonetheless, certain particular wellsprings of fatty esters are hitherto to be abused for this comparative reason. This exploration subsequently tests into one of the less used wellsprings of fatty esters in watermelon. The oil from the kernels demonstrations a top-notch yield presents significant utilitarian gatherings for change and thus was utilized to set up an assortment of oleochemicals which demonstrated excellence materials in contrast with the routinely utilized oils feed frameworks for oleochemicals after portrayal. The photopolymers acquired indicated piercing vinyl protons for consistent polymerize.

Sick day advice for people with diabetes

2021 ◽  
Vol 32 (Sup3) ◽  
pp. S10-S13
Author(s):  
Martha Stewart
Keyword(s):  
Type 2 Diabetes ◽  
Diabetes Management ◽  
Glucose Levels ◽  
Emergency Hospital Admission ◽  
Intercurrent Illness ◽  
Martha Stewart ◽  
The Common ◽  
Tract Infections

In this article Martha Stewart discusses how illness affects diabetes management and outlines the ‘sick-day advice’ that should be shared with people living with type 1 and type 2 diabetes Intercurrent illness can cause glucose levels to rise in people with diabetes mellitus. These illnesses include the common cold, diarrhoea and vomiting, urinary tract infections and COVID-19. If diabetes is not managed well during illness it can escalate and result in more serious conditions, such as diabetic ketoacidosis (DKA) and hyperosmolar hyperglycaemic state (HHS), which would require emergency hospital admission. This article discusses how illness affects diabetes management and outlines the ‘sick-day advice’ that should be shared with people living with type 1 and type 2 diabetes.

Isolation and characterization of novel tachykinins from the posterior salivary gland of the common octopus Octopus vulgaris

Peptides ◽  
2003 ◽  
Vol 24 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Atsuhiro Kanda ◽  
Eiko Iwakoshi-Ukena ◽  
Kyoko Takuwa-Kuroda ◽  
Hiroyuki Minakata
Keyword(s):  
Salivary Gland ◽  
Octopus Vulgaris ◽  
Isolation And Characterization ◽  
The Common ◽  
Common Octopus

Characterization of damage and biotic factors associated with the decline of Eucalyptus wandoo in southwest Western Australia

2005 ◽  
Vol 35 (11) ◽  
pp. 2589-2602 ◽  
Author(s):  
Ryan J Hooper ◽  
K Sivasithamparam
Keyword(s):  
Western Australia ◽  
Partial Harvest ◽  
Foliage Density ◽  
Density Ratios ◽  
The Relationship ◽  
Mixed Age ◽  
Eucalyptus Wandoo

Crown decline of wandoo, Eucalyptus wandoo, in southwest Western Australia has escalated over the last 10 years, so very few unaffected stands remain. To assess the canopy-damage characteristics of trees in decline a destructive, partial-harvest method was used to sample branches in natural mixed-age stands. Necrosis of common cankers was closely associated with type-1 borer damage, characterized by "longitudinal" gallery structure on declining trees only. Cankers were found to be consistently more severe on declining trees, with decay regions affecting a greater proportion of sapwood tissue. Several infestations causing type-1 borer damage that varied in age were found on declining branches, providing evidence of cyclical damage events. Type-2 borer damage characterized by "ring-barking" gallery structure caused extensive damage in canopies, but was not always associated with decline. Interactions between foliage density and canker score showed that 17.8% and 63.1% of the variability in foliage-density ratios was accounted for in declining intermediate-health and unhealthy classes, respectively. The relationship was negligible for the healthy class (9.9%), providing strong evidence that cankers are causing foliage loss in declining canopies. Evidence suggests that an interaction between type-1 borer infestations and decay-causing fungi is responsible for the decline in E. wandoo wandoo canopies.

scholarly journals The Blue Copper-Containing Nitrite Reductase fromAlcaligenes xylosoxidans: Cloning of the nirAGene and Characterization of the Recombinant Enzyme

1999 ◽  
Vol 181 (8) ◽  
pp. 2323-2329 ◽  
Author(s):  
Miguel Prudêncio ◽  
Robert R. Eady ◽  
Gary Sawers
Keyword(s):  
Amino Acid ◽  
Nitrite Reductase ◽  
Recombinant Enzyme ◽  
Leader Peptide ◽  
Resonance Spectroscopy ◽  
Gene Encoding ◽  
Blue Copper

ABSTRACT The nirA gene encoding the blue dissimilatory nitrite reductase from Alcaligenes xylosoxidans has been cloned and sequenced. To our knowledge, this is the first report of the characterization of a gene encoding a blue copper-containing nitrite reductase. The deduced amino acid sequence exhibits a high degree of similarity to other copper-containing nitrite reductases from various bacterial sources. The full-length protein included a 24-amino-acid leader peptide. The nirA gene was overexpressed inEscherichia coli and was shown to be exported to the periplasm. Purification was achieved in a single step, and analysis of the recombinant Nir enzyme revealed that cleavage of the signal peptide occurred at a position identical to that for the native enzyme isolated from A. xylosoxidans. The recombinant Nir isolated directly was blue and trimeric and, on the basis of electron paramagnetic resonance spectroscopy and metal analysis, possessed only type 1 copper centers. This type 2-depleted enzyme preparation also had a low nitrite reductase enzyme activity. Incubation of the periplasmic fraction with copper sulfate prior to purification resulted in the isolation of an enzyme with a full complement of type 1 and type 2 copper centers and a high specific activity. The kinetic properties of the recombinant enzyme were indistinguishable from those of the native nitrite reductase isolated from A. xylosoxidans. This rapid isolation procedure will greatly facilitate genetic and biochemical characterization of both wild-type and mutant derivatives of this protein.

scholarly journals Genetic Risk Scores for Diabetes Diagnosis and Precision Medicine

2019 ◽  
Vol 40 (6) ◽  
pp. 1500-1520 ◽  
Author(s):  
Miriam S Udler ◽  
Mark I McCarthy ◽  
Jose C Florez ◽  
Anubha Mahajan
Keyword(s):  
Risk Scores ◽  
Diabetes Diagnosis ◽  
Physiological Mechanisms ◽  
Risk Variants ◽  
Polygenic Scores ◽  
Disease Predisposition ◽  
Dna Sequence Variants

Abstract During the last decade, there have been substantial advances in the identification and characterization of DNA sequence variants associated with individual predisposition to type 1 and type 2 diabetes. As well as providing insights into the molecular, cellular, and physiological mechanisms involved in disease pathogenesis, these risk variants, when combined into a polygenic score, capture information on individual patterns of disease predisposition that have the potential to influence clinical management. In this review, we describe the various opportunities that polygenic scores provide: to predict diabetes risk, to support differential diagnosis, and to understand phenotypic and clinical heterogeneity. We also describe the challenges that will need to be overcome if this potential is to be fully realized.

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