A xanthine-negative, melibiose-positive species of Streptomyces

1977 ◽  
Vol 23 (2) ◽  
pp. 212-214
Author(s):  
A. Bakerspigel
Keyword(s):  
Unusual Strain ◽  
Produce Acid

The organism VH/CN-71 which had been isolated from a growth in a cat and described initially as an "unusual strain of Nocardia" is a streptomycete. This organism can also produce acid from melibiose although it is unable to decompose xanthine. Its sporophores are short, hooked, curved, or open-looped with extended spirals. Present data suggest that VH/CN-71 may belong to the "flavus" series of Streptomyces.

scholarly journals A Multidisciplinary Approach for the Assessment of Origin, Fate and Ecotoxicity of Metal(loid)s from Legacy Coal Mine Tailings

Toxics ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 164
Author(s):  
Honorine Gauthier-Manuel ◽  
Diane Radola ◽  
Flavien Choulet ◽  
Martine Buatier ◽  
Raphaël Vauthier ◽  
...  
Keyword(s):  
Coal Mine ◽  
Mine Tailings ◽  
Mine Drainage ◽  
Mineral Resources ◽  
Subcellular Fractionation ◽  
Mining Operations ◽  
Biological Responses ◽  
Receiving Waters ◽  
Coal Tailings ◽  
Produce Acid

Over the course of history, the development of human societies implied the exploitation of mineral resources which generated huge amounts of mining wastes leading to substantial environmental contamination by various metal(loid)s. This is especially the case of coal mine tailings which, subjected to weathering reactions, produce acid mine drainage (AMD), a recurring ecological issue related to current and past mining activities. In this study, we aimed to determine the origin, the fate and the ecotoxicity of metal(loid)s leached from a historical coal tailing heap to the Beuveroux river (Franche-Comté, France) using a combination of mineralogical, chemical and biological approaches. In the constitutive materials of the tailings, we identified galena, tetrahedrite and bournonite as metal-rich minerals and their weathering has led to massive contamination of the water and suspended particles of the river bordering the heap. The ecotoxicity of the AMD has been assessed using Chironomus riparius larvae encaged in the field during a one-month biomonitoring campaign. The larvae showed lethal and sub-lethal (growth and emergence inhibition and delay) impairments at the AMD tributary and near downstream stations. Metal bioaccumulation and subcellular fractionation in the larvae tissues revealed a strong bioavailability of, notably, As, Pb and Tl explaining the observed biological responses. Thus, more than 70 years after the end of mining operations, the coal tailings remain a chronic source of contamination and environmental risks in AMD effluent receiving waters.

THE PREDOMINANT BACTERIA IN NATURAL ZOOGLOEAL COLONIES: I. ISOLATION AND IDENTIFICATION

1967 ◽  
Vol 13 (12) ◽  
pp. 1671-1682 ◽  
Author(s):  
Richard F. Unz ◽  
Norman C. Dondero
Keyword(s):  
Waste Water ◽  
Single Cell ◽  
Agar Medium ◽  
Isolation And Identification ◽  
Group I ◽  
Yeast Autolysate ◽  
Conventional Methods ◽  
Group Ii ◽  
Produce Acid

Direct, single-cell isolations of bacteria, primarily from natural, branching, waste water zoogloeas, were made by micromanipulation. Isolations were also made by conventional methods. Direct isolates were classified, chiefly with regard to zoogloea formation, into two groups designated group I (zoogloea-forming) and group II (nonzoogloea-forming). Casitone – glycerol – yeast autolysate agar medium was best for the isolation of group I bacteria. Group I isolates reduced nitrate to gas, possessed urease and catalase, and gave positive oxidase reactions. They were generally able to hydrolyze gelatin but, with one exception, did not produce acid from carbohydrates, and none produced H2S, indole, or acetylmethylcarbinol or utilized Koser citrate. Group II strains were usually more diverse on differential tests and could be distinguished from group I strains. Group I strains were characterized as Zoogloea strains and were found to be the predominant bacteria in natural, branching, zoogloeal colonies.

Linseed Oil Paint as Ionomer: Synthesis and Characterization

2004 ◽  
Vol 852 ◽  
Author(s):  
Charles S. Tumosa ◽  
David Erhardt ◽  
Marion F. Mecklenburg ◽  
Xingfang Su
Keyword(s):  
Physical Properties ◽  
Polymer Chain ◽  
Linseed Oil ◽  
Chemical Properties ◽  
Synthesis And Characterization ◽  
High Susceptibility ◽  
Low Strength ◽  
Produce Acid

ABSTRACTAs linseed oil ages, hydrolysis and oxidation produce acid groups on the polymer chain that may lead to ionomeric behavior. The effect of these changes is difficult to determine in old paints because of the lack of records of environmental and treatment histories that can alter the physical properties significantly. A series of paints were made that have chemical properties similar to those of aged paints and that mimic old paints. Their properties seem to show flexibility as well as coherency but low strength and a high susceptibility to solvents.

Evaluation of methods for the rapid identification of Neisseria gonorrhoeae in a routine clinical laboratory

1976 ◽  
Vol 4 (1) ◽  
pp. 19-21
Author(s):  
H M Pollock
Keyword(s):  
Neisseria Gonorrhoeae ◽  
Clinical Laboratory ◽  
Fluorescent Antibody ◽  
Rapid Identification ◽  
Reliable Identification ◽  
Initial Trial ◽  
Carbohydrate Degradation ◽  
Routine Clinical Laboratory ◽  
Evaluation Of Methods ◽  
Produce Acid

Of 78 isolates of Neisseria gonorrhoeae, 21 failed to grow and produce acid in unsupplemented cystine-Trypticase agar (CTA); whereas positive reactions were obtained by using serum-supplemented CTA and fluorescent antibody (FA). An additional 290 strains of Neisseria were evaluated by FA and by a rapid carbohydrate degradation technique (RF). There was agreement between the two methods 92% of the time on the initial trial and 99% of the time with repeats on discrepancies. The RF and FA tests provided rapid and reliable identification of N. gonorrhoeae, alleviating the problems of CTA due to lack of growth and need for overnight incubation.

scholarly journals Relationship between Oral Hygiene and Dietary Behaviour and Dental Caries Status in Primary School Children

2018 ◽  
Vol 13 (3) ◽  
pp. 411-416 ◽  
Author(s):  
Sara M Mohamed Nbaia ◽  
Ari Yuniastuti ◽  
Dyah Rini Indriyanti
Keyword(s):  
Dental Caries ◽  
Primary School ◽  
School Children ◽  
Oral Hygiene ◽  
Descriptive Analysis ◽  
Dietary Behavior ◽  
Dietary Behaviour ◽  
Primary School Children ◽  
Analysis Method ◽  
Produce Acid

Tooth decay can be caused by bacteria that live in the mouth. These bacteria feed on food leftovers in the teeth and produce acid. This acid destroys the enamel layer, dentine layer, and pulp. The purpose of this study is to analyze the risk factors of dental caries in primary school children. The subjects of this study were 77 students of SD Sendangmulyo 1 Semarang. We used questionnaires, diagnoses, and interviews for data collection. For data analysis, we used descriptive analysis method. The results showed that the most common dental caries risk factor in primary school children was sugar consumption. Up to 72% of children agreed to bring packed meal, 90.7% were used to have a breakfast, 80% used to clean their mouth every day, 70.7% clean their mouth after meals, 64% brush their teeth after eating candy, and 89.3 % brush their teeth before going to bed. There is a relationship between oral hygiene and dietary behavior and dental caries status of primary school children. In conclusion, there is a relationship between oral hygiene and dietary behavior and dental caries status of primary school children.

scholarly journals Unusual strain glassy phase in Fe doped Ni2Mn1.5In0.5

2018 ◽  
Vol 112 (2) ◽  
pp. 022409 ◽  
Author(s):  
R. Nevgi ◽  
K. R. Priolkar
Keyword(s):  
Glassy Phase ◽  
Unusual Strain

An Unusual Strain of Alfalfa Mosaic Virus Detected in Crotalaria L. Germplasm

2006 ◽  
Vol 5 (3) ◽  
pp. 397-400 ◽  
Author(s):  
A.G. Gillaspie, Jr. . ◽  
N.A. Barkley . ◽  
J.B. Morris .
Keyword(s):  
Mosaic Virus ◽  
Alfalfa Mosaic Virus ◽  
Unusual Strain

scholarly journals Tuning friction to a superlubric state via in-plane straining

2019 ◽  
Vol 116 (49) ◽  
pp. 24452-24456 ◽  
Author(s):  
Shuai Zhang ◽  
Yuan Hou ◽  
Suzhi Li ◽  
Luqi Liu ◽  
Zhong Zhang ◽  
...  
Keyword(s):  
Atomic Scale ◽  
Atomistic Simulations ◽  
Contact Interface ◽  
Frictional Behavior ◽  
Flexible Materials ◽  
On Demand ◽  
Scale Structures ◽  
Unusual Strain ◽  
Strain Dependent ◽  
Additional Channel

Controlling, and in many cases minimizing, friction is a goal that has long been pursued in history. From the classic Amontons–Coulomb law to the recent nanoscale experiments, the steady-state friction is found to be an inherent property of a sliding interface, which typically cannot be altered on demand. In this work, we show that the friction on a graphene sheet can be tuned reversibly by simple mechanical straining. In particular, by applying a tensile strain (up to 0.60%), we are able to achieve a superlubric state (coefficient of friction nearly 0.001) on a suspended graphene. Our atomistic simulations together with atomically resolved friction images reveal that the in-plane strain effectively modulates the flexibility of graphene. Consequently, the local pinning capability of the contact interface is changed, resulting in the unusual strain-dependent frictional behavior. This work demonstrates that the deformability of atomic-scale structures can provide an additional channel of regulating the friction of contact interfaces involving configurationally flexible materials.

Sign in / Sign up

Export Citation Format

Share Document