Determination of spectrum and different temperature of spontaneous chemiluminescence in rice seeds during early imbibition

2005 ◽  
Author(s):  
WenLi Chen ◽  
Da Xing ◽  
Roeland Van Wijk
Keyword(s):  
Spontaneous Chemiluminescence ◽  
Rice Seeds

scholarly journals Rice seeds vigor through image processing of seedlings

2019 ◽  
Vol 49 (8) ◽  
Author(s):  
André Pich Brunes ◽  
Ádamo de Souza Araújo ◽  
Letícia Winke Dias ◽  
Júlio Antoniolli ◽  
Gizele Ingrid Gadotti ◽  
...  
Keyword(s):  
Image Processing ◽  
Processing System ◽  
Rice Seedling ◽  
Seed Vigor ◽  
Shoot Length ◽  
Root And Shoot Length ◽  
Rice Seeds ◽  
Length And Area ◽  
Potential Use

ABSTRACT: The aim of this paper was to verify the viability of digital image processing in the measurement of rice seedling and its potential use as seed vigor test. The experiment took place at the Laboratório Didático de Análise de Sementes, located in Capão do Leão (RS), using seeds of eight rice cultivars: Irga 424, Puitá Inta CL, BRS Esmeralda, SCS 116, Guri Inta CL, BRS Pampa, BRSGO Serra Dourada and Olimar. An image processing system (IPS) was used to measure length and area of shoot and root as an index of seed vigor in rice seeds. The experiment design was completely randomized with five replications. The evaluated variables were root and shoot length in graded ruler and by image, root and shoot area, and field emergence. Results obtained with the IPS were correlated with other quality tests though the Pearson tests. Determination of shoot length and leaf area of the seedlings obtained through IPS is effective for assessing the vigor of rice seeds.

scholarly journals OXYGEN-DEPENDENT PHAGOCYTOSIS OF BLOOD MONOCYTES IN CHILDREN WITH HELICOBACTER PYLORI-ASSOCIATED GASTRIC AND DUODENAL EROSIONS AND ULCER

2018 ◽  
Vol 8 (2) ◽  
pp. 157-163 ◽  
Author(s):  
O. A. Kolenchukova ◽  
I. N. Gvozdev ◽  
N. N. Gorbachova ◽  
I. S. Litvinova
Keyword(s):  
Helicobacter Pylori ◽  
Oxygen Free Radicals ◽  
Area Under The Curve ◽  
Duodenal Mucosa ◽  
Blood Monocytes ◽  
Peroxide Oxidation ◽  
Active Forms Of Oxygen ◽  
Spontaneous Chemiluminescence ◽  
H Pylori

The aim of the research is to study oxygen-dependent phagocytosis of blood monocytes in children with gastric and duodenal erosions  and ulcers by chemiluminescence analysis. The subjects of the  research were blood monocytes, extracted from blood in 44 children  with gastric and duodenal erosions and ulcers in the ages from 11 to  18 years. Microscopic tests for the bioptats of gastric mucosa of  both standard regions and edges of ulcer defects had resulted in the  determination of 2 groups of the patients with gastric and duodenal  erosions and ulcers. The 1st group was represented by Helicobacter  pylori high dissemination. As for the 2nd group, the patients showed  low bacterization. The tests for luminol-dependent hemiluminescence of blood monocytes in patients with H. pylorihigh  dissemination of gastric and duodenal mucosa demonstrated the  significant increase of the intensity and the growth of areas both  under the curve of spontaneous response and under the curve in the  zimozan-induced process as compared to the monocyte activity  in the group with low dissemination. Following the lucigenin- dependent chemiluminescence reactions in the group with H. pylori  high dissemination we had found significant increase of the time of  approaching the peak in both spontaneous response and zimozan- induced processes while the activation index was higher in  comparison with phagocyte activities of monocytes in the group with  low dissemination. Further stage of the research was to identify CagA-positive strains of H. pylori in the children with gastric and  duodenal erosions and ulcers. Studying chemiluminescence activity  of blood lymphocytes in the patients with anti-CagA antibodies we found the true increase of the time of reaching the peak, the  intensity and the area under the curve in spontaneous process in  luminol-dependent response and the time of reaching intensity peak  and the intensity of spontaneous chemiluminescence reaction,  lucigenin being an activator. So we marked the increase of the  activity of oxygen-dependent phagocytosis of blood monocytes in  children with H. pylori associated with gastric and duodenal erosions  and ulcers related to H. pylori increased bacterization. The growth of  H. pylori dissemination results in the higher stage of stomach  mucosa inflammation. Therefore active phagocytes generate more  intensively the formation of active forms of oxygen, free radicals and the products of peroxide oxidation. CagA-positive strains of H. pylori, as a rule, are associated with the higher level of inflammatory  activity than  CagA-negative ones. As a result of such influence the  functional activity of monocytes increases, because they are  «professional » phagocytes. The ability to perform phagocytosis is better expressed in them as compared to other leukocytes.

scholarly journals Determination of laminar burning velocity of methane/air flames in sub atmospheric environments

2021 ◽  
pp. 50-62
Author(s):  
Arley Cardona Vargas ◽  
Carlos E. Arrieta ◽  
Hernando Alexander Yepes Tumay ◽  
Camilo Echeverri-Uribe ◽  
Andrés Amell
Keyword(s):  
Energy Demand ◽  
Burning Velocity ◽  
Reynolds Numbers ◽  
Equivalence Relations ◽  
Laminar Burning Velocity ◽  
Oxidation Of Methane ◽  
Spontaneous Chemiluminescence ◽  
Polluting Emissions ◽  
The City

The global energy demand enhances the environmental and operational benefits of natural gas as an energy alternative, due to its composition, mainly methane (CH4), it has low polluting emissions and benefits in energy and combustion systems. In the present work, the laminar burning velocity of methane was determined numerically and experimentally at two pressure conditions, 0.85 atm and 0.98 atm, corresponding to the city of Medellín and Caucasia, respectively, located in Colombia. The environmental conditions were 0.85 atm, 0.98 atm, and 295±1 K. The simulations and experimental measurements were carried out for different equivalence relations. Experimental laminar burning velocities were determined using the burner method and spontaneous chemiluminescence technique, flames were generated using burners with contoured rectangular ports to maintain laminar Reynolds numbers for the equivalence ratios under study and to reduce the effects of stretch and curvature in the direction of the burner's axis. In general, the laminar burning velocity fits well with the numerical results. With the results obtained, a correlation is proposed that relates the laminar burning velocity with the effects of pressure, in the form SL=aPb, where a and b are model constants. Sensitivity analysis was performed using the GRI-Mech 3.0 mechanism which showed that the most sensitive reaction was H+O2=O+OH (R38). Additionally, it was found that the reactions H+CH3 (+M)=CH4 (+M) (R52), 2CH3 (+M)=C2H6 (+M) (R158), and O+CH3=H+CH2O (R10) dominate the consumption of CH3 which is an important radical in the oxidation of methane, this analysis is carried out for equivalence ratios of 0.8 and 1.0, and atmospheric pressures of 0.85 atm and 0.98 atm

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

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