Nucleic acid content in relation to cell size in the mature larval salivary gland of Drosophila melanogaster

1952 ◽  
Vol 36 (1) ◽  
pp. 97-113 ◽  
Author(s):  
Elizabeth K. Patterson ◽  
Marjorie E. Dackerman
Keyword(s):  
Drosophila Melanogaster ◽  
Salivary Gland ◽  
Nucleic Acid ◽  
Cell Size ◽  
Acid Content ◽  
Nucleic Acid Content ◽  
Larval Salivary Gland

scholarly journals Variations of bacterial-specific activity with cell size and nucleic acid content assessed by flow cytometry

2002 ◽  
Vol 28 ◽  
pp. 131-140 ◽  
Author(s):  
P Lebaron ◽  
P Servais ◽  
AC Baudoux ◽  
M Bourrain ◽  
C Courties ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Nucleic Acid ◽  
Cell Size ◽  
Acid Content ◽  
Specific Activity ◽  
Nucleic Acid Content

Influence of the RNA content on oogenesis in the bobbed mutants of Drosophila melanogaster

Development ◽  
1971 ◽  
Vol 25 (2) ◽  
pp. 237-246
Author(s):  
Jag Mohan
Keyword(s):  
Drosophila Melanogaster ◽  
Nucleic Acid ◽  
Acid Content ◽  
Nucleic Acid Content ◽  
Wild Type ◽  
Dna And Rna ◽  
Stage Of Development ◽  
Rna Content ◽  
Egg Chambers ◽  
Total Dna

Developing egg chambers of Drosophila melanogaster (wild-type and bobbed mutants) have been examined for their nucleic acid content by cytophotometric methods. No differences were observed in the total DNA and RNA content of the egg chambers at all stages between the bobbed mutants and the wild type. It is shown that the process of oogenesis in bobbed females is prolonged, and that this prolongation occurs at all the stages of oocyte development. Since the ovaries of the bobbed females synthesize less rRNA per unit time, it is likely that this prolongation allows the egg chambers of the bobbed females to normalize their RNA content. When they achieve a given RNA content, they proceed to the next stage of development.

scholarly journals Characterization of the Population of the Sulfur-Oxidizing Symbiont of Codakia orbicularis (Bivalvia, Lucinidae) by Single-Cell Analyses

2007 ◽  
Vol 73 (7) ◽  
pp. 2101-2109 ◽  
Author(s):  
Audrey Caro ◽  
Olivier Gros ◽  
Patrice Got ◽  
Rutger De Wit ◽  
Marc Troussellier
Keyword(s):  
Nucleic Acid ◽  
Single Cell ◽  
Cell Size ◽  
Acid Content ◽  
Size Analysis ◽  
Nucleic Acid Content ◽  
Tropical Environments ◽  
Multiple Copies ◽  
Sulfur Oxidizing ◽  
Light Side

ABSTRACT We investigated the characteristics of the sulfur-oxidizing symbiont hosted in the gills of Codakia orbicularis, a bivalve living in shallow marine tropical environments. Special attention was paid to describing the heterogeneity of the population by using single-cell approaches including flow cytometry (FCM) and different microscopic techniques and by analyzing a cell size fractionation experiment. Up to seven different subpopulations were distinguished by FCM based on nucleic acid content and light side scattering of the cells. The cell size analysis of symbionts showed that the symbiotic population was very heterogeneous in size, i.e., ranging from 0.5 to 5 μm in length, with variable amounts of intracellular sulfur. The side-scatter signal analyzed by FCM, which is often taken as a proxy of cell size, was greatly influenced by the sulfur content of the symbionts. FCM revealed an important heterogeneity in the relative nucleic acid content among the subclasses. The larger cells contained exceptionally high levels of nucleic acids, suggesting that these cells contained multiple copies of their genome, i.e., ranging from one copy for the smaller cells to more than four copies for the larger cells. The proportion of respiring symbionts (5-cyano-2,3-ditolyl-terazolium chloride positive) in the bacteriocytes of Codakia revealed that around 80% of the symbionts hosted by Codakia maintain respiratory activity throughout the year. These data allowed us to gain insight into the functioning of the symbionts within the host and to propose some hypotheses on how the growth of the symbionts is controlled by the host.

scholarly journals THE RIBONUCLEIC ACID AND DEOXYRIBONUCLEIC ACID CONTENT OF MONONUCLEAR LEUKOCYTES OF DIFFERENT SIZES STUDIED BY ULTRAVIOLET CYTOPHOTOMETRY

1973 ◽  
Vol 21 (7) ◽  
pp. 628-633 ◽  
Author(s):  
ALFREDO MARIANO GARCIA ◽  
PATRICIA A. N. SULLIVAN
Keyword(s):  
Nucleic Acid ◽  
Cell Size ◽  
Dna Content ◽  
Random Error ◽  
Acid Content ◽  
Deoxyribonucleic Acid ◽  
Nucleic Acid Content ◽  
Mononuclear Leukocytes ◽  
Total Nucleic Acid ◽  
Dna And Rna

Rat mononuclears (lymphocytes and monocytes) were studied for total nucleic acid content by means of ultraviolet cytophotometry. Another set was treated with ribonuclease, and deoxyribonucleic acid (DNA) was measured using the same technique. It was found that total nucleic acid content (DNA and RNA) increases linearly with cell size from about 20 units in lymphocytes having 5 µ in diameter up to around 30 units in cells having 12-14 µ in diameter; this is to say, an almost 50% increase for a 6-7-fold enlargement. After ribonuclease treatment, however, the value of the integrated extinction (DNA) tends to remain constant for different cell sizes. A 650% variation in area is accompanied by a DNA change of less than 6%. The differences between treated and nontreated cells are nonsignificant for populations having up to 7.0-7.5 µ in diameter, which implies that small lymphocytes either have a negligible amount of RNA or that the instrument is not sensitive enough to detect it (less than 7% of the DNA content, this figure being the random error of our technique). These differences become highly significant for mononuclears having 8 µ or more in diameter. Therefore, while DNA tends to be constant and independent from cell size, RNA content tends to be harmoniously inconstant, since it is correlated with cell (and nuclear) size and degree of chromatin diffusion.

Cytogenetic Pathways in Beetle Speciation

1962 ◽  
Vol 94 (9) ◽  
pp. 941-955 ◽  
Author(s):  
Stanley G. Smith
Keyword(s):  
Salivary Gland ◽  
Nucleic Acid ◽  
Acid Content ◽  
Chromosome Morphology ◽  
Evolutionary Change ◽  
Nucleic Acid Content ◽  
Cytological Analysis ◽  
Animal Kingdom ◽  
General Review ◽  
The Past

Investigations carried out over the past 50 years have made it abundantly clear that the chromosome, besides being a medium of evolutionary change, has an evolution of its own. In the animal kingdom, this has been elegantly proved by the extensive research on Drosophila (for a general review see Patterson and Stone, 1952), made possible largely by its possession of giant salivary gland chromosomes; by cytological analysis of hybrid rodents in the genus Gerbillus (Wahrman and Zahavi, 1958) and newts of the genus Triturus (White, 1946; Spurway and Callan, 1950; Callan and Spurway, 1951); by investigations carried out on various Orthoptera, facilitated by the clarity of meiosis in interracial (White, 1957a), interspecific (Klingstedt, 1939), and “intergeneric” (Helwig, 1955) hybrids; and by studies on the mantid genus Ameles (Wahrman and O'Brien, 1956), through the credibility derived from cytophotometric measurement of desoxyribose nucleic acid content. Much of the evidence adduced elsewhere, for example, Manna and Smith's (1959) survey of the bark weevil genus Pissodes, was based on comparative chromosome morphology, but, as will become evident later, our reasoning in this particular instance has so far proved correct.

Flow-microfluorometric analysis of Escherichia coli, Rhizobium meliloti, and Rhizobium japonicum at different stages of the growth cycle

1977 ◽  
Vol 23 (9) ◽  
pp. 1165-1169 ◽  
Author(s):  
Alan S. Paau ◽  
Joe R. Cowles ◽  
James Oro
Keyword(s):  
Escherichia Coli ◽  
Nucleic Acid ◽  
Stationary Phase ◽  
Cell Size ◽  
Acid Content ◽  
Rhizobium Meliloti ◽  
Growth Cycle ◽  
Rhizobium Japonicum ◽  
Nucleic Acid Content ◽  
E Coli

The applicability of flow-microfluorometry (FMF) to the study of bacterial samples was investigated on cultures of Rhizobium meliloti, Rhizobium japonicum, and Escherichia coli using fluorescent and light-scattering signals. This technique which analyzes individual bacterial cells in a population was used to monitor the relative change in nucleic acid content and cell size during the growth cycle of the three microorganisms which were known to have different growth rates.Early log-phase E. coli cells contained at least eightfold more nucleic acid and were significantly larger than the stationary-phase cells. Cultures of early log-phase R. meliloti cells contained three to four-fold more nucleic acid and were slightly larger than cells in the stationary phase. Rhizobium japonicum had very little change in either parameter. In general, the amount of change in both cell size and nucleic acid content upon initiation of log-phase growth was related to the overall growth rate of the organisms, with E. coli experiencing the greatest change and R. japonicum the least. Results obtained by FMF analyses, therefore, were consistent with observations reported by earlier workers. Cultures of R. meliloti also were used to demonstrate that the intensity of the fluorescent signals was sensitive to digestion by DNase and RNase and to prolonged storage and fixation. The potential use of FMF in the study of microorganisms is discussed.

Application of Ogur & Rosen's Method for the Determination of Nucleic Acid Content of Bacteria

1957 ◽  
Vol 12 (2) ◽  
pp. 125-129 ◽  
Author(s):  
Nobuyasu KAWASAKI ◽  
Ichiro TAKI ◽  
Chiaki WATANABE ◽  
Kiyoshi MATOBA ◽  
Mokichiro NISHIO ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Acid Content ◽  
Nucleic Acid Content

scholarly journals Using flow cytometry and light-induced fluorescence technique to characterizethe variability and characteristics of bioaerosols in springtime at Metro Atlanta, Georgia

2018 ◽  
Author(s):  
Arnaldo Negron ◽  
Natasha DeLeon-Rodriguez ◽  
Samantha M. Waters ◽  
Luke D. Ziemba ◽  
Bruce Anderson ◽  
...  
Keyword(s):  
Flow Cytometry ◽  
Nucleic Acid ◽  
Acid Content ◽  
Fungal Spores ◽  
Epifluorescence Microscopy ◽  
Nucleic Acid Content ◽  
Rain Event ◽  
Bacterial Cells ◽  
Sampling System ◽  
Spores And Pollen

Abstract. The abundance and speciation of primary biological aerosol particles (PBAP) is important for understanding their impacts on human health, cloud formation and ecosystems. Towards this, we have developed a protocol for quantifying PBAP collected from large volumes of air with a portable wet-walled cyclone bioaerosol sampler. A flow cytometry (FCM) protocol was then developed to quantify and characterize the PBAP populations from the sampler, which were confirmed against epifluorescence microscopy. The sampling system and FCM analysis were used to study PBAP in Atlanta, GA over a two-month period and showed clearly defined populations of DNA-containing particles: Low Nucleic Acid-content particles (bioLNA), High Nucleic Acid-content particles (HNA) being fungal spores and pollen. We find that daily-average springtime PBAP concentration (1 to 5 μm diameter) ranged between 1.4 × 104 and 1.1 × 105 m−3. The BioLNA population dominated PBAP during dry days (72 ± 18 %); HNA dominated the PBAP during humid days and following rain events, where HNA (e.g., wet-ejected fungal spores) comprised up to 92 % of the PBAP number. Concurrent measurements with a Wideband Integrated Bioaerosol Sensor (WIBS-4A) showed that FBAP and total FCM counts are similar; HNA (from FCM) significantly correlated with ABC type FBAP concentrations throughout the sampling period (and for the same particle size range, 1–5 μm diameter). However, the FCM bioLNA population, possibly containing bacterial cells, did not correlate to any FBAP type. The lack of correlation of any WIBS FBAP type with the bioLNA suggest bacterial cells may be more difficult to detect with autofluorescence than previously thought. Ιdentification of bacterial cells even in the FCM (bioLNA population) is challenging, given that the fluorescence level of stained cells at times may be comparable to that seen from abiotic particles. HNA and ABC displayed highest concentration on a humid and warm day after a rain event (4/14), suggesting that both populations correspond to wet-ejected fungal spores. Overall, information from both instruments combined reveals a highly dynamic airborne bioaerosol community over Atlanta, with a considerable presence of fungal spores during humid days, and a bioLNA population dominating bioaerosol community during dry days.

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