On the physiology of a fungus symbiotic with orchids

1975 ◽  
Vol 53 (2) ◽  
pp. 144-155 ◽  
Author(s):  
Gaëtan Harvais ◽  
Ain Raitsakas
Keyword(s):  
Glutamic Acid ◽  
Aspartic Acid ◽  
Growth Phase ◽  
Culture Media ◽  
Dry Weight ◽  
Active Growth ◽  
Mycorrhizal Associations ◽  
The Media ◽  
Aeration Conditions ◽  
Ethanol Extracts

A fungus (Rs10) symbiotic with orchids was grown in axenic liquid-still culture on mineral–sugar media. Dextrose was limiting at 1% and 2%, with mycelium dry weights directly proportional to the amount of sugar in the medium, but not at 3%. Sucrose gave similar results and was converted into reducing sugars, in the medium, in excess of utilization. With 3% sugar growth was not much better than with 2%, and daily dry weight values were more variable after the active growth phase. With 1% and 2% dextrose in the media, and 10, 20, and 30 ml/flask, dry weight was not affected by the different aeration conditions. Inocula failed to grow on media with pH 3.0, but growth seemed normal with pH 4.5. Ninhydrin-positive substances were not released in the culture media but were found in ethanol extracts of the mycelium. They were more abundant during the active growth phase and on media with 1% vs. 2% dextrose; with less sugar, high levels were maintained for longer periods. They consisted mainly of glutamic acid, glutamine, and aspartic acid, with some fluctuations in concentration related to growth phase. Metabolism seemed different on media with ammonium + nitrate vs. nitrate alone as nitrogen source. The hyphal wall contained chitin.Protocorms of Dactylorhiza purpurella (an orchid with which Rs10 is symbiotic) were grown on eight nutrient media with one amino acid in each, until only the latter were depleted. The best results were with glutamic acid, ornithine, and arginine, followed by aspartic acid and glycine. Alanine, serine, and lysine were toxic. N-acetyl-D-glucosamine derived from chitin was drip-fed to other cultures. It was ineffective at low and toxic at high concentrations.Implications of the results relating to mycorrhizal associations are briefly discussed.

scholarly journals STUDIES ON PNEUMOCOCCUS GROWTH INHIBITION

1924 ◽  
Vol 39 (2) ◽  
pp. 219-244 ◽  
Author(s):  
Oswald H. Robertson ◽  
Richard H. P. Sia
Keyword(s):  
Growth Phase ◽  
Whole Blood ◽  
Culture Media ◽  
The Other ◽  
Natural Immunity ◽  
Active Growth ◽  
Similar Action ◽  
Inhibition Of Growth ◽  
A New Technique ◽  
Do So

Somewhat discordant results which have been reported by others who have investigated the property of the whole blood of resistant animals to cause inhibition of growth or death of pneumococci have led us to investigate this matter and to develop a new technique in which the conditions as they are present in the animal body are more nearly imitated. The observations already made have rendered it probable that phagocytosis plays some rôle in any destructive power for pneumococcus which whole blood possesses. We have, therefore, employed mixtures of serum and leucocytes in our tests, since when blood is coagulated the conditions become highly artificial. Furthermore, in order to imitate more nearly the conditions in the circulating blood the mixtures have been constantly, though gently, agitated. For this purpose a specially devised apparatus has been employed. The mixtures of serum and leucocytes have been inoculated with varying numbers of pneumococci in the active growth phase and after varying intervals of time the tubes containing the mixtures of serum, leucocytes, and bacteria have been opened, examined microscopically, and cultures made. Employing this technique it has been found that the growth of pneumococci having low virulence for cats is markedly inhibited in mixtures of cat serum and cat leucocytes. It was impossible to recover pneumococci from the tubes showing no apparent growth, either when the contents were transplanted into various kinds of culture media, or when the contents were injected into mice of a variety highly susceptible to pneumococcus infection. 10,000 times the number of pneumococci sufficient ordinarily to kill a mouse failed to do so after a 24 hour sojourn in the cat serum-leucocyte mixture. Mixtures of dog serum and leucocytes exert a similar action. The serum and leucocytes of animals susceptible to pneumococcus infection (rabbits and guinea pigs,) on the other hand, failed to injure pneumococci even in extremely small quantities. These results indicate that the blood of resistant animals, at least of the dog and cat, possesses destructive properties for pneumococci, and that this destructive power is not possessed by the blood of certain susceptible animals. The experiments suggest that natural immunity depends chiefly, if not entirely, upon this property. The leucocytes play an active part in this process, but whether the destruction of the pneumococci occurs entirely within the leucocytes or not is not determined. That the serum also plays a part is shown by the fact that when the serum of resistant animals was inactivated before being used in the serum-leucocyte mixture, the growth of even very small numbers of pneumococci was not prevented. Further experiments with cat serum and leucocytes were carried out to determine the optimum rate and time of agitation, the amount of serum and leucocytes required, and also the period of incubation necessary for the inhibition of growth and death of the pneumococci to occur.

The production of extracellular amino acids by rumen bacteria

1978 ◽  
Vol 24 (10) ◽  
pp. 1236-1241 ◽  
Author(s):  
I. L. Stevenson
Keyword(s):  
Amino Acids ◽  
Glutamic Acid ◽  
Aspartic Acid ◽  
Free Amino Acids ◽  
Free Amino ◽  
Volatile Fatty Acids ◽  
Basal Medium ◽  
Culture Fluid ◽  
Rumen Bacteria ◽  
Active Growth

One hundred and sixteen freshly isolated rumen bacteria and 10 laboratory strains were studied for the production and excretion of free amino acids during growth in a basal medium containing glucose, cellobiose, and soluble starch as the energy sources, (NH4)2SO4 as the prime nitrogen source, volatile fatty acids, hemin, vitamins, Na2CO3, and cysteine as the reducing agent. Amino acid analyses of 48-h culture fluids of the isolates indicated the presence of alanine, glutamic acid, valine, aspartic acid, glycine, serine, lysine, methionine, leucine, isoleucine, threonine, histidine, arginine, phenylalanine, and tyrosine. Most isolates excreted some free amino acids. Alanine, glutamic acid, valine, aspartic acid, and glycine were found in the greatest concentrations with some isolates accumulating between 50 and 295 μg/ml of one or more of these compounds. Concentrations of the remaining amino acids rarely exceeded 20 μg/ml of culture fluid. Growth studies demonstrated that the amino acids were excreted during active growth of the bacteria and ceased shortly after growth became limited.

Investigation by NMR of metabolic routes to bacterial γ-poly(glutamic acid) using 13C-labeled citrate and glutamate as media carbon sources

1995 ◽  
Vol 41 (10) ◽  
pp. 902-909 ◽  
Author(s):  
Anne-Marie Cromwick ◽  
Richard A. Gross
Keyword(s):  
Citric Acid ◽  
Glutamic Acid ◽  
Bacillus Licheniformis ◽  
Culture Media ◽  
Carbon Sources ◽  
Enrichment Factors ◽  
Carbon Skeleton ◽  
Repeat Units ◽  
The Media ◽  
Multiple Recycling

Bacillus licheniformis ATCC 9945A produces γ-poly(glutamic acid) (γ-PGA) when using glutamate, citrate, and glycerol in combination as media carbon sources. Also, various aspects of B. licheniformis cellular physiology are affected by the concentration of Mn(II) salts in culture media. Thus, the metabolism of carbon sources into γ-PGA as a function of MnSO4 concentration was studied by enriching the media with either L-[1,2-13C]glutamic acid (NH2—2CH(1COOH)—(CH2)2-COOH) or [1,5-13C]citric acid (HOO1C—CH2—C(OH)(COOH)—CH2—5COOH) at two media MnSO4 concentrations (615 and 0 μM). Enrichment factors (EF) from 13C-NMR spectra were calculated from the ratio of peak intensities from 13C-enriched γ-PGA divided by the ratio of peak intensities for nonenriched γ-PGA. EF values were than used to determine the percentage of repeat units that were formed from glutamate and citrate. The percentage of repeat units formed from provided glutamate at the 0 and 615 μM Mn(II) media concentrations was 89 ± 14 and 67 ± 11%, respectively. These respective products have 51 ± 9 and 39 ± 11% of their repeat units formed with apparent retention of the glutamate carbon skeleton. Also, enrichment of γ-PGA repeat units at C-1 was found to be lower than C-2 at both Mn(II) levels. Thus, provided glutamate was used to a large extent for polymer formation with both retention of the carbon skeleton as well as decarboxylation at C-1. Provided citrate was also used as a source of carbon to form repeat units. At the 0 and 615 μM media Mn(II) levels, 9 ± 4 and 19 ± 5% of repeat units were formed from citrate. It is believed that citrate is metabolized to γ-PGA by entry into the citric acid cycle and formation of α-ketoglutarate. Analysis of products from cultivations where both glutamate and citrate were 13C enriched indicated that citrate and glutamate carbon source metabolism to γ-PGA occurs via independent pathways to common monomer precursors without multiple recycling of these carbon sources through catabolic and anabolic pathways.Key words: γ-poly(glutamic acid), metabolism, manganese, Bacillus licheniformis, nuclear magnetic resonance.

scholarly journals Response of Sweet Basil (Ocimum Basilicum L.) to Spray of Aspartic and Glutamic Acids, and Their Effect on Its Growth and Its Volatile Oil Content

2021 ◽  
Vol 923 (1) ◽  
pp. 012020
Author(s):  
Qasim Ajel Al-Zyadi
Keyword(s):  
Essential Oil ◽  
Glutamic Acid ◽  
Plant Height ◽  
Aspartic Acid ◽  
Oil Content ◽  
Dry Weight ◽  
Growing Season ◽  
Volatile Oil ◽  
Ocimum Basilicum ◽  
Sweet Basil

Abstract Experiment was conducted in fields of Agriculture College, Al-Muthanna University, during the growing season 2020, to study the response of sweet basil (Ocimum basilicum L.) to spraying three concentrations of aspartic acid (0, 75 and 150 mg.L−1) and with three concentrations of glutamic acid (0, 75 and 150 mg.L−1), and their impact on its growth and essential oil content. Results showed that the basil plants that have been sprayed with aspartic acid at a concentration (150 mg.L−1) significantly superior in plant height, fresh and dry weight of shoot, percentage and yield of volatile oil (45.61cm, 19.70 gm.plant−1, 1.80 gm.plant−1, 1.75 % and 31.48 μL.plant−1) respectively. Results also showed the significant effect of spraying glutamic acid at a concentration (150 mg.L−1), which gave highest values in plant height, fresh and dry weight of shoot, percentage and yield of volatile oil (48.67 cm., 20.28 gm.plant−1, 1.83 gm.plant−1, 1.56 % and 29.08 μL.plant−1) respectively.

The value of 21 amino acids as nitrogen sources for Phytophthora cactorum and P. heveae

1971 ◽  
Vol 17 (10) ◽  
pp. 1319-1325 ◽  
Author(s):  
J. A. Leal ◽  
M. E. Gallegly ◽  
V. G. Lilly
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Glutamic Acid ◽  
Aspartic Acid ◽  
Culture Media ◽  
Nitrogen Sources ◽  
Ammonium Nitrogen ◽  
Phytophthora Cactorum ◽  
Ph Values

The value of 21 amino acids as nitrogen sources for Phytophthora cactorum (Leb. and Cohn) Schroet. and P. heveae Thompson has been studied using the dry weights of mycelium, changes in the pH values of the culture media, and the accumulation of ammonium nitrogen in the culture media as the criteria. Two concentrations of each amino acid were used to furnish 106 and 424 mg N/liter. The three parameters mutually supported each other in dividing the amino acids into two groups, poor and good.The following amino acids were poor sources of nitrogen for both species: L-hydroxyproline, L-isoleucine, L-leucine, L-lysine, L-methionine, and L-tryptophan. L-Phenylalanine was a good amino acid for P. cactorum, and a poor amino acid for P. heveae. L-Cysteine and L-valine were good sources of nitrogen for P. heveae, but poor nitrogen sources for P. cactorum. The following amino acids were good sources of nitrogen for both species: L-α-alanine, L-arginine, L-asparagine, L-aspartic acid, L-glutamine, L-glutamic acid, glycine, L-histidine, L-proline, L-serine, L-threonine, and L-tyrosine.

scholarly journals The Effectiveness of Nutrient Culture Solutions with Agar Addition as An Evaluation Media of Rice Under Iron Toxicity Conditions

BIOEDUSCIENCE ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 24-29
Author(s):  
Turhadi ◽  
Miftahuddin ◽  
Hamim ◽  
Munif Ghulamahdi
Keyword(s):  
Culture Media ◽  
Dry Weight ◽  
Culture Solution ◽  
Growth Responses ◽  
Shoot Dry Weight ◽  
Agar Solution ◽  
Nutrient Culture ◽  
Half Strength ◽  
The Media ◽  
Fe Toxicity

Background: Evaluation of the tolerance level of rice to iron (Fe) toxicity stress can be done using a hydroponic system in a nutrient culture solution under a controlled condition. This study aimed to obtain a nutrient culture solution that effective as a medium for evaluating the response of rice under Fe toxicity stress condition. Methods: This experiment was carried out by comparing the effectiveness of three kinds of nutrient culture media, namely Yoshida’s Half-Strength solution (HSY), Yoshida’s Half-Strength + 0.2% agar solution (HSYA), and Yoshida’s Full-Strength + 0.2% agar solution (FSYA) using two rice genotypes, Inpara 5 (sensitive to Fe toxicity) and Mahsuri (tolerant to Fe toxicity). Leaf bronzing level, plant dry weight, and pH of nutrient culture media were observed in this experiment. Results: The results showed that the stress response as represented by the bronzing score in Inpara 5 leaves was known to be higher than that of Mahsuri in the three nutrient culture media. The decrease of root and shoot dry weight in Inpara 5 was higher than that of Mahsuri. In addition, the decrease in the pH of nutrient culture solution media without an agar addition (HSY) occurred faster than the media with the agar addition (HSYA and FSYA). Conclusion: The HSYA and FSYA media exhibited a similar pattern of pH declining but causing significant differences in growth responses between Inpara 5 and Mashuri indicating the HSYA medium is considered more efficient compared to the FSYA medium because it only requires a smaller amount of agar.

The biochemical composition of Cylindrotheca closterium (Ehrenb.) Rayman net Levin, as a source of biologically active substances in cumulative cultivation

2021 ◽  
pp. 1-9
Author(s):  
Svetlana N. Zheleznova ◽  
Ruslan G. Gevorgiz
Keyword(s):  
Fatty Acids ◽  
Stationary Phase ◽  
Growth Phase ◽  
Dry Weight ◽  
Biologically Active ◽  
Exponential Growth Phase ◽  
Total Lipids ◽  
Active Growth ◽  
Cylindrotheca Closterium ◽  
Dry Biomass

In this work, we studied the biochemical characteristics of the diatom Cylindrotheca closterium in the cumulative mode of cultivation in different phases of growth. According to our data, in the exponential growth phase, C. closterium biomass is characterized by a minimum lipid content of 3% of dry biomass and a maximum carbohydrates content of 23% of dry weight. During the transition of C. closterium culture to the stationary growth phase, as in the case of a representative of diatoms, a rather high accumulation of total lipids is observed – to 28% dry weight, while the carbohydrates content decreases to 7%. At the end of the stationary phase (21st day of cultivation), the content of fatty acids is 50% of total lipids or 12.5% of dry weight. A certain relationship between the concentrations of fucoxanthin, total lipids and polyunsaturated fatty acids (PUFA) in the biomass of C. сlosterium diatom was recorded. During active growth in the exponential phase, the concentration of fucoxanthin was 0.5–1 mg∙g-1 dry weight. During the tranition of the culture to the stationary phase of growth, the concentration of fucoxanthin reached 7±0.2 mg∙g-1 dry biomass. At the end of the stationary phase, the concentration of fucoxanthin reached its maximum value of 20 mg∙g-1 dry weight.

MEDIA SOCIALIZATION OF PERSONALITY IN THE CONTEXT OF INMUTATION IN THE MASS MEDIA

2021 ◽  
pp. 104-109
Author(s):  
Chernysh O.O.
Keyword(s):  
Mass Media ◽  
Negative Impact ◽  
Effective Interaction ◽  
Individual Characteristics ◽  
Media Culture ◽  
Active Growth ◽  
Media Space ◽  
The Media ◽  
The Individual

The urgency of the researched problem is connected with the growing role of mass media in modern conditions leads to change of values and transformation of identity of the person. The active growth of the role of the media, their influence on the formation and development of personality leads to the concept of “media socialization” and immutation in the media. The aim of the study is to outline the possibilities of the process of media socialization in the context of immutation in the media. The methods of our research are: analysis of pedagogical, psychological, literature, synthesis, comparison, generalization. The article analyzes the views of domestic and foreign scientists on the problem of immutation in the media and the transformation of the information space. In the context of the mass nature of the immutation of society, the concept of “media socialization” becomes relevant, which is the basis for reducing the negative impact of the media on the individual.The author identifies the lack of a thorough study of the concept of “media socialization” in modern scientific thought. Thus, media socialization is associated with the transformation of traditional means of socialization, and is to assimilate and reproduce the social experience of mankind with the help of new media.The article analyzes the essence of the concepts “media space”, “mass media” and “immutation”. The influence of mass media on the formation and development of the modern personality is described in detail.The study concluded that it is necessary to form a media culture of the individual, to establish safe and effective interaction of young people with the modern media system, the formation of media awareness, media literacy and media competence in accordance with age and individual characteristics for successful media socialization. The role of state bodies in solving the problem of media socialization of the individual was also determined. It is determined that the process of formation of media culture in youth should take place at the level of traditional institutions of socialization of the individual.The author sees the prospect of further research in a detailed analysis and study of the potential of educational institutions as an institution and a means of counteracting the mass nature of the immutation of society.Key words: immutation, media socialization, mass media, media space, information.

Eliminating Thrips in Microshoot Cultures

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 506d-506
Author(s):  
Robert R. Tripepi ◽  
Holly J. Schwager ◽  
Mary W. George ◽  
Joseph P. McCaffrey
Keyword(s):  
Betula Pendula ◽  
Culture Media ◽  
Dry Weight ◽  
Thrips Tabaci ◽  
Shoot Cultures ◽  
Onion Thrips ◽  
Ulmus Americana ◽  
Shoot Height ◽  
Tissue Culture Media ◽  
Plant Tissue Cultures

Two insecticides, acephate or azadirachtin, were added to tissue culture media to determine their effectiveness in controlling onion thrips (Thrips tabaci Lindeman.) and to determine if these insecticides could damage the plant shoot cultures. To test for insecticide phytotoxicity, microshoots from European birch (Betula pendula), American elm (Ulmus americana), `Pink Arola' chrysanthemum (Dendranthema grandiflora), `America' rhododendron (Rhododendron catawbiense), `Golden Emblem' rose (Rosa hybrida), and `Gala' apple (Malus domestica) were placed in 130-ml baby food jars containing 25 ml of medium supplemented with 6.5, 13, or 26 mg/l Orthene® (contained acephate) or 0.55, 1.1, or 2.2 ml/l Azatin® (contained azadirachtin). Control jars lacked insecticide. To test for thrips control, 13 mg/l Orthene® or 0.55 ml/l Azatin® was added to Murashige and Skoog medium, and 10 thrips were placed on `Gala' apple microshoots in each jar. Jars were sealed with plastic wrap. In both studies, microshoot dry weight and heights were determined. In the second study, the total number of thrips per jar was also determined 3 weeks after inoculation. Microshoots on Orthene®-treated media lacked phytotoxicity symptoms, regardless of the concentration used. In contrast, Azatin® hindered plant growth, decreasing shoot height or dry weight by up to 85% depending on the species. Both insecticides prevented thrips populations from increasing, since less than 10 thrips were found in jars with insecticide-treated medium. Control jars, however, contained an average of almost 70 thrips per jar. This study demonstrated that both Orthene® and Azatin® were effective for eradicating thrips from plant tissue cultures, but Orthene® should probably be used because Azatin® was phytotoxic to all species tested.

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