Germination and growth of the tree Handroanthus chrysanthus (Bignoniaceae) under nursery conditions

Introduction: Selective logging of forests has significantly diminished the densities of Handroanthus chrysantha Jacq. in Colombia. Therefore, there is a need for studies that contribute to its management. Objective: We aimed to evaluate seed germination and the growth of seedlings under nursery conditions. Methods: Four pre-germinative, four organic substrates and two luminosity conditions were tested. We used a random multifactorial experimental design composed of 32 controlled factors. The main components were immersion of seeds in water at room temperature at different times, combinations of organic substrates and exposure of the factors to shade and sun. Results: We recorded 395 and 290 germinated seeds, corresponding to 51 and 38% of the total sown under shade and sun, respectively. The factors with the best germination values were immersion for 24 hours with alluvial sand and immersion for 24 hours with river sand of mixed with ant soil (2:1) under shade and, without immersion with alluvial sand+ground of ant 2:1 and immersion for 24 hours with chicken manure+ant soil 2:1 under sun. The highest growth in height, vigour and survival was observed in seedlings exposed to full sunlight in any of the combinations of organic substrates. Conclusion: The propagation of H. chrysantha should germinate the seeds under shadow and then expose them to the sun to stimulate their growth..

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Electron Microscopy of Human Gallstones

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100065523 ◽

1971 ◽

Vol 29 ◽

pp. 296-297

Author(s):

C. Wolpers ◽

R. Blaschke

Keyword(s):

Electron Microscopy ◽

Room Temperature ◽

Bile Pigment ◽

X Ray Diffraction ◽

Triclinic Crystal System ◽

X Ray ◽

Follow Up Study ◽

Infra Red ◽

Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

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Room Temperature Aerobic Peroxidation of Organic Substrates Catalyzed by Cobalt(III) Alkylperoxo Complexes

Journal of the American Chemical Society ◽

10.1021/jacs.1c07158 ◽

2021 ◽

Author(s):

Yunzhou Chen ◽

Huatian Shi ◽

Chi-Sing Lee ◽

Shek-Man Yiu ◽

Wai-Lun Man ◽

...

Keyword(s):

Room Temperature ◽

Organic Substrates

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Responses of quinoa (Chenopodium quinoa Willd.) seeds stored under different germination temperatures

Acta Scientiarum Agronomy ◽

10.4025/actasciagron.v39i1.30989 ◽

2017 ◽

Vol 39 (1) ◽

pp. 83 ◽

Cited By ~ 5

Author(s):

Andressa Strenske ◽

Edmar Soares de Vasconcelos ◽

Vanessa Aline Egewarth ◽

Neusa Francisca Michelon Herzog ◽

Marlene De Matos Malavasi

Keyword(s):

Room Temperature ◽

Storage Time ◽

Chenopodium Quinoa ◽

Seed Vigor ◽

Continuous Darkness ◽

Experimental Conditions ◽

Growing Seasons ◽

Germinating Seeds ◽

Germinated Seeds ◽

Plot Design

In this experiment, we assessed the germination and vigor of quinoa seeds packed in paper bags and stored at room temperature for 36, 85, 119, 146, 177 and 270 days. The seeds were harvested under experimental conditions in Marechal Candido Rondon, Paraná, during the 2012/13 growing seasons. Four replicates of 100 seeds each were established for each storage time, and the seeds were evaluated, on paper, based on the BOD under the following experimental temperature conditions: alternating temperatures of 20 and 30°C and a constant temperature of 25°C. The seeds from both treatments were subject to seven-hour photoperiods and 25°C under continuous darkness. The germinated seeds were counted daily for eight days after sowing, and we evaluated the percentages of normal and abnormal seedlings and the germination index. The experimental design was completely randomized using a split-plot design. Increasing the storage time decreased the percentage of germinated seeds and seed vigor due to the increased number of abnormal seedlings. Over the 430-day study period, quinoa seed germination completely declined under the experimental conditions. The final number of germinating seeds should be evaluated 7 days after the beginning of the germination test.

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Isolation and Characterization of Rhizosphere Bacteria and their Effect on Germination of Rice Seeds and Growth of Seedlings

Journal of Bio-Science ◽

10.3329/jbs.v15i0.2206 ◽

1970 ◽

Vol 15 ◽

pp. 77-82 ◽

Cited By ~ 2

Author(s):

Shamima Nasrin ◽

MA Rahman

Keyword(s):

Mineral Nutrients ◽

Soil Microflora ◽

Rhizosphere Bacteria ◽

Rice Seedlings ◽

Root Zones ◽

Isolation And Characterization ◽

Rice Seeds ◽

Germination And Growth ◽

Growth Of Seedlings

Rhizosphere bacteria were isolated from root zones from rice fields. These were cultured in laboratory conditions and investigated the effects on germination and growth of rice seedlings. They inhabit around the roots and live on root exude and benefit the plants by altering the solubility and availability of mineral nutrients and protecting the roots from invasion of pathogens by creating an antibiotic barrier around the root. It has been found that rhizosphere bacteria have no effect on germination of rice seeds. Both the rhizosphere bacteria and the Agrobacterium have been found to produce better growth of rice seedlings in pot cultures but later is less effective than the former. Rhizosphere bacteria are mixtures of many e.g. Actimomyces, Proteobacteria, Pseudomonas etc. but Agrobacterium sp is single. Key words: Rhizosphere, Bacteria, Symbiosis, Soil microflora, Non-leguminous plants. doi: 10.3329/jbs.v15i0.2206 J. bio-sci. 15: 77-82, 2007

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Interactive effect of salinity, SAR and boron on the germination and growth of seedlings of some paddy (Oryza sativa) varieties

Plant and Soil ◽

10.1007/bf00264177 ◽

1973 ◽

Vol 39 (3) ◽

pp. 603-609 ◽

Cited By ~ 4

Author(s):

K. V. Paliwal ◽

K. K. Mehta

Keyword(s):

Oryza Sativa ◽

Interactive Effect ◽

Germination And Growth ◽

Growth Of Seedlings

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Solid State Rechargeable Li-Ion Batteries Prepared at Room Temperature over Flexible Organic Substrates: Performance and Limitations

ECS Meeting Abstracts ◽

10.1149/ma2016-01/2/233 ◽

2016 ◽

Keyword(s):

Solid State ◽

Room Temperature ◽

Organic Substrates ◽

Li Ion Batteries ◽

Li Ion

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THE INFLUENCE OF THE EXTRACT OF SOME CROPS AND SOIL RESIDUES ON GERMINATION AND GROWTH

Canadian Journal of Plant Science ◽

10.4141/cjps60-024 ◽

1960 ◽

Vol 40 (1) ◽

pp. 188-197 ◽

Cited By ~ 38

Author(s):

K. F. Nielsen ◽

W. B. Woods ◽

T. F. Cuddy

Keyword(s):

Seed Germination ◽

Root Length ◽

Deionized Water ◽

The Other ◽

Percentage Germination ◽

Soil Extracts ◽

Field Crops ◽

Time Required ◽

Germination And Growth ◽

Germinated Seeds

Six plant species were germinated in sand wetted with water extracts of tissues of five field crops and three soils. Deionized water was used as a check f he study was conducted using standard seed germination techniques.Alter 7 to 10 days all of the germinated seeds were harvested and measurements made of the shoot and root lengths.Alfalfa extract caused the greatest reduction in shoot and root length as well as m percentage germination. It caused the greatest increase in the time required for germination. Timothy extract was not quite as harmful as the alfalfa. Extracts of oats, corn and potatoes were still less harmful with potato extract causing the least effect.The soil extracts generally had very little effect when compared with deionized water.Plant species showed marked differences in tolerance to the extracts alfalfa being the most resistant and timothy the least.Where water alone was used rate of germination and per cent germination were as high or higher than with the other extracts, but the root and shoot lengths were not always the greatest.

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A study of the reaction of protoporphyrin IX with human globin

Biochemical Journal ◽

10.1042/bj1370319 ◽

1974 ◽

Vol 137 (2) ◽

pp. 319-329 ◽

Cited By ~ 14

Author(s):

Amyra Treffry ◽

Stanley Ainsworth

Keyword(s):

Species Distribution ◽

Human Blood ◽

Chromatographic Separation ◽

Gel Electrophoresis ◽

Room Temperature ◽

Protoporphyrin Ix ◽

Freeze Dried ◽

Tryptophan Residues ◽

Main Components ◽

Effect Of Light

The present paper reports an investigation of the reaction of protoporphyrin IX with globin prepared from the HbA0 component of human blood. The porphyringlobin produced is always heterogeneous; however, when globin is used immediately after preparation, its affinity for porphyrin is higher and the product less heterogeneous than when the globin has been frozen or freeze-dried. The affinity of globin for haemin is less affected by its history. With freshly prepared globin, reconstitution at room temperature provides a different distribution of porphyringlobin species than reconstitution at 4°C. Further changes in the species distribution of cold-reconstituted samples may be observed by gel electrophoresis when the samples are aged for 24h at room temperature. Chromatographic separation of such porphyringlobin samples on CM-Sephadex generally revealed five species with two in predominating amounts. It was consistently observed that over a period of 18 days, the faster moving of the two main components decreased in amount whereas the slower-moving component correspondingly increased. However, when the main components are separated, they remain homogeneous over the same length of time. The effect of light on porphyringlobin was also investigated. It was shown that porphyringlobin is photo-oxidized: as a result the porphyrin is destroyed together with most of the histidine, methionine and all of the tryptophan residues of the protein.

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