scholarly journals Storage of Calophyllum brasiliense Cambess. seeds

2016 ◽  
Vol 77 (3) ◽  
pp. 431-436 ◽  
Author(s):  
F. C. Nery ◽  
D. O. Prudente ◽  
A. A. Alvarenga ◽  
R. Paiva ◽  
M. C. Nery
Keyword(s):  
Environmental Conditions ◽  
Room Temperature ◽  
Timber Industry ◽  
Freezer Storage ◽  
Rational Use ◽  
Calophyllum Brasiliense ◽  
Medicinal Properties ◽  
Cold Chamber

Abstract Calophyllum brasiliense is a species native to Brazil and has potential for use in the timber industry, in the reforestation of degraded areas, besides having medicinal properties. Its propagation is mainly by seeds which, depending on their recalcitrant characteristics, leads to difficulty in conservation, due to changes in its physiological potential during storage. Aiming to contribute to the expansion of its cultivation, rational use and conservation, the objective of this study was to investigate the behavior of C. brasiliense seeds during storage. Different packings (paper, aluminum and polyethylene) and environmental conditions (room temperature and cold chamber) were quarterly tested over 12 months, by evaluating germination viability and vigor. Based on the results, it was concluded that packaging in polyethylene and freezer storage provided the best conditions for the conservation of seeds, keeping them viable for a period of nine months.

scholarly journals Temperature Effects on Optical Trapping Stability

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 954
Author(s):  
Dasheng Lu ◽  
Francisco Gámez ◽  
Patricia Haro-González
Keyword(s):  
Brownian Motion ◽  
Environmental Conditions ◽  
Temperature Effects ◽  
Room Temperature ◽  
Optical Trapping ◽  
State Of The Art ◽  
Thermal Sensing ◽  
The Stability ◽  
Object Of Study ◽  
Optically Trapped

In recent years, optically trapped luminescent particles have emerged as a reliable probe for contactless thermal sensing because of the dependence of their luminescence on environmental conditions. Although the temperature effect in the optical trapping stability has not always been the object of study, the optical trapping of micro/nanoparticles above room temperature is hindered by disturbances caused by temperature increments of even a few degrees in the Brownian motion that may lead to the release of the particle from the trap. In this report, we summarize recent experimental results on thermal sensing experiments in which micro/nanoparticles are used as probes with the aim of providing the contemporary state of the art about temperature effects in the stability of potential trapping processes.

scholarly journals Pre-harvest application of salicylic acid influence physicochemical and quality characteristics of ‘Chimarrita’ peaches during cold storage

2019 ◽  
pp. 46
Author(s):  
Jakellinye Miranda ◽  
Suélen Braga de Andrade, Andressa Vighi Schiavon ◽  
Pedro Luis Panisson Kaltbach Lemos ◽  
Cláudia Simone Madruga Lima ◽  
Marcelo Barbosa Malgarim
Keyword(s):  
Salicylic Acid ◽  
Shelf Life ◽  
Cold Storage ◽  
Room Temperature ◽  
Soluble Solids ◽  
Acid Solutions ◽  
Post Harvest ◽  
Hue Angle ◽  
Cold Chamber

Peach is a climacteric highly-perishable fruit whose post-harvest preservation relies largely on cold storage. The combination of the last with other technologies allows to extend the shelf life of this product. One alternative is the utilization of salicylic acid, a natural compound involved in many physiological phenomena such as resistance against diseases and ripening. Considering these facts, the objective of the present work was to evaluate the effect of pre-harvest application of salicylic acid solutions on the quality of ‘Chimarrita’ peaches during post-harvest cold storage. The experiment was conducted at the Federal University of Pelotas/RS, in the campus of Capão do Leão/RS - Brazil. The application of salicylic acid solutions was performed by direct pulverization on the fruits, 30 days prior to harvest. The concentrations were: 0,0 (control); 1,0; 1,5; and 2,0 mM. After harvest, the fruits were stored in a cold chamber at 1,0 ± 0,5°C and 85-90% RH, for 30 days. The analyses were performed at the following cold storage periods (plus 2 days at room temperature of 20°C to all treatments, in order to simulate commercialization conditions): 10 (+2) days; 20 (+2) days; e 30 (+2) days. The variables evaluated were: mass loss (%); flesh firmness (N); DA index; color (L, a*, b* and hue angle); wooliness incidence (%); rot incidence (%); total soluble solids (°Brix); pH; titrable acidity (% of organic acids); and ratio. The salicylic acid doses and/or the cold storage periods had significant effects on all the evaluated parameters. For most of the parameters analyzed, the intermediate dosis of 1mM (and also 1,5mM) of salicilic acid showed the most promising results. Therefore, the application of salicylic acid solutions 30 days prior to harvest is a technique which can be combined to cold storage in order to shift the quality and the shelf-life of ‘Chimarrita’ peaches.

scholarly journals Germination of Croton urucurana L. seeds exposed to different storage temperatures and pre-germinative treatments

2012 ◽  
Vol 84 (1) ◽  
pp. 191-200 ◽  
Author(s):  
Silvana P.Q. Scalon ◽  
Rosilda M. Mussury ◽  
Andréa A. Lima
Keyword(s):  
Electrical Conductivity ◽  
Gibberellic Acid ◽  
Room Temperature ◽  
Germination Speed ◽  
Cold Chamber ◽  
Storage Temperatures

The present work evaluated the germinability and vigor of Croton urucurana seeds. 1) Seeds were sorted by color (caramel, gray and black) and were subjected to seven different pre-germination treatments followed by incubation at 20ºC, 25°C or 20/30°C. 2) Seeds were stored in cold chambers or at room temperature for up to 300 days and were subsequently incubated at 20/30ºC in a germination chamber or under greenhouse conditions. Only gray seeds showed significant germination rates. The highest first count percentages of total germination and the highest germination speed indices were observed in control seeds and in those which were treated with water or 200 mg. L-1 gibberellic acid for 12 hours. Seeds stored under refrigeration showed the highest values for all of the characteristics examined, as well as less electrical conductivity of the imbibing solution. Seedlings were more vigorous when seeds were stored for 300 days in a cold chamber. The seedlings production can be increased by incubating the seeds at alternating temperatures (20/30°C). The seeds do not need pre-germination treatments.

SERS Observation of the Adsorption Behavior of O2, H2O, and SO2 on Silver Powder Surfaces at Nearly Real Environmental Conditions

1989 ◽  
Vol 43 (2) ◽  
pp. 239-245 ◽  
Author(s):  
Hideyuki Matsuta ◽  
Kichinosuke Hirokawa
Keyword(s):  
Environmental Conditions ◽  
Atomic Oxygen ◽  
Room Temperature ◽  
Silver Powder ◽  
Surface Species ◽  
Superoxide Ion ◽  
Surface Enhanced ◽  
High Partial Pressure ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The interaction of O2, H2O, and SO2 on silver powder prepared from the reduction of AgNO3 by NaBH4 was studied by surface-enhanced Raman scattering (SERS) at room temperature. The presence of H2O of about 103 Pa and O2 of about 104-105 Pa was necessary for observation of SERS peaks of SO32− and SO42−. The superoxide ion O2- was observed under high partial pressure for O2 conditions. SERS peaks of atomic oxygen, superoxide ion O2-, SO32−, and SO42− disappeared on evacuation. SERS peaks of surface species such as Ag2O did not disappear on evacuation.

Hygroscopic Swelling Behavior of 3D Printed Parts due to Changes in Environmental Conditions

2016 ◽  
Author(s):  
Ju-young Park ◽  
Sangho Ha ◽  
Eunju Park ◽  
Daeil Kwon ◽  
Namhun Kim
Keyword(s):  
Relative Humidity ◽  
Environmental Conditions ◽  
Room Temperature ◽  
Selective Laser Sintering ◽  
Swelling Behavior ◽  
Hygroscopic Swelling ◽  
Dimension Change ◽  
Nylon 12 ◽  
3D Printed ◽  
Local Weather

Selective laser sintering (SLS) printers have been used for rapid prototyping, and the prototypes of part assemblies have been reported to expand or shrink over time. This paper examines the hygroscopic swelling behavior of 3D printed parts from SLS printers. A total of 10 hexahedron samples were produced using nylon-12, which is a common material used for prototyping. Half of the samples were exposed to a high temperature to reduce the moisture content, and the rest were left at a room temperature. In the meantime, 13 dimensions of each sample were measured periodically along with the local weather records including relative humidity in order to track the hygroscopic swelling behavior of the samples. The results showed that the deformation was mostly occurred to the dimensions parallel to the sintering layers. Also, changes in these dimensions were found to have a high correlation with the relative humidity regardless of temperature conditions. These results imply that changes in environmental conditions such as relative humidity result in the deformation of 3D printed parts after production. The high correlation between dimension change and relative humidity also indicates the layup orientation is a decisive factor to predict the deformation of 3D printed parts. Thus, unexpected deformation of 3D printed parts can be avoided by optimizing the parts design considering the layup orientation and by controlling the environmental conditions.

scholarly journals The Viability ofBact. coliandBact. aerogenesin Water. A Method for the Rapid Enumeration of these Organisms

1935 ◽  
Vol 35 (3) ◽  
pp. 437-448 ◽  
Author(s):  
A. E. Platt
Keyword(s):  
River Water ◽  
Rapid Method ◽  
Environmental Conditions ◽  
Low Temperatures ◽  
Room Temperature ◽  
Sterile Water ◽  
Raw Water ◽  
Direct Plating ◽  
Rapid Enumeration ◽  
Different Temperatures

1. The survival of coliform organisms was studied in river water, either raw or sterilised, kept at different temperatures.2. For determining the coliform count and the differentialcoli-aerogenescount in sterilised river water, direct plating of the water on agar, with subsequent study of a number of colonies picked at random, was used. For raw river water the rapid method described by Wilson and his colleagues (1935) was used, which obviates the necessity of plating and of colonial examination.3. WhenBact. coliandBact. aerogeneswere held in stored river water, which was protected from agitation, they underwent a gradual decrease in numbers and finally disappeared. At 37°C. they died out rapidly, but survived for a much longer time at temperatures in the neighbourhood of 0°C. They were able to survive longer in sterile water than in raw water.4. Observations, however, made on water kept at room temperature and subjected to gentle aeration showed that not only did the organisms not die out, but that they actually multiplied, so that their numbers were considerably higher at the end of two months than at the beginning of the experiment.5. In raw river water coliform bacilli survived longer at room temperature when kept in the dark than in daylight.6. On the whole,aerogenes1proved more resistant thanBact. colito the environmental conditions provided. This was particularly noticeable in samples kept at room temperature (18°C.). In samples of raw water kept at 37°C.aerogenesproved slightly more resistant thancoli, while at 0–2°C. the reverse was true.7. The general conclusion seems to be that, except at very low temperatures,aerogenesis likely to survive longer in raw river water thanBact. coli.8. This conclusion is clearly of importance in the interpretation of thecoli-aerogenesresults in water analysis.

scholarly journals Sensitivity of shotcrete Brazilian discs coated with thin spray-on liners to environmental conditions

2021 ◽  
Vol 121 (7) ◽  
Author(s):  
M.J. Kanda ◽  
T.R. Stacey
Keyword(s):  
High Temperature ◽  
Environmental Conditions ◽  
Laboratory Testing ◽  
Laboratory Tests ◽  
Room Temperature ◽  
Mining Industry ◽  
High Humidity ◽  
Rock Support ◽  
Strength Enhancement ◽  
Indirect Tensile

SYNOPSIS Thin spray-on liners (TSLs) have been used as sealants and rock support in tunnels for over 25 years. Laboratory tests have indicated satisfactory properties that can provide adequate strength, adhesion, toughness, and elasticity as part of rock support systems in mining excavations. These characteristics are, however, not always demonstrated in practice, when mine environmental conditions do not correspond with laboratory environmental conditions. The shortcomings of TSLs experienced in the mining industry have raised concerns, resulting in scepticism from some operators regarding their utilization. The research described in this paper aims to investigate TSL performance in environmental conditions similar to those experienced in mines. Brazilian indirect tensile (BIT) specimens were prepared from precast shotcrete and coated with TSLs. The specimens were then exposed to different environmental conditions for up to 112 days before BIT testing under various conditions: laboratory room temperature and humidity; saturated room temperature; and combined saturated and high temperature (50°C). Additional uncoated shotcrete and TSL BIT specimens were prepared for comparison purposes. The results of the BIT tests showed that environmental conditions have a significant influence on the tensile strength enhancement of shotcrete by TSLs. Water-based TSLs are most likely to be suitable for high humidity environments, although their performance decreases at higher temperatures. Numerical modelling of TSL-coated BIT samples confirms the potential limitations of designing TSL support based only on laboratory testing carried out under room conditions. Keywords: thin spray-on liner, Brazilian indirect tensile (BIT) test, TSL performance, environmental conditions, humidity, high temperature.

scholarly journals Fotoblastismo e temperaturas na germinação de sementes de celosias

2018 ◽  
Vol 24 (4) ◽  
pp. 408-414
Author(s):  
Janine Farias Menegaes ◽  
Geovana Facco Barbieri ◽  
Rogério Antônio Bellé ◽  
Ubirajara Russi Nunes
Keyword(s):  
Moisture Content ◽  
Environmental Conditions ◽  
Laboratory Tests ◽  
Average Moisture Content ◽  
Limiting Factor ◽  
Thermal Range ◽  
Celosia Argentea ◽  
Different Temperatures ◽  
Presence And Absence ◽  
Cold Chamber

Germination is the result of the triggering of various processes occurred in the seed, which are influenced by the environmental conditions, especially light and temperature. In this way, the objective of the present study was to evaluate the influence of different temperatures and photoblastic on the germination of cockscomb seeds. The experiment was carried out in a completely randomizeddesign, with a 2 x 5 factorial scheme (two lighting regimes and five temperatures), with four replicates of 50 seeds, for two species of cockscomb (Celosia argentea L. and C. cristata L.). The lighting regimes were with absence (dark continuous) and the presence of light (photoperiod of 24 h), and temperatures were constant at 15, 20, 25, 30 and 35 ºC. The seed lots of the two species of cockscomb were cultivated in 2012 and stored in a cold chamber (15 ºC and 40% RH), with an average moisture content of 11% and a mean germination of 98%. The results of the laboratory tests indicated that the two species of cockscomb presented fast germination in average 2.5 and 4.5 days for the regimes with presence and absence of illumination, respectively, characterizing as neutral photoblastic species. However, it was observed that the temperature is a limiting factor for the germination of the two species of cockscomb, having its optimal thermal range between 20 and 30 ºC.

scholarly journals Problems of use and conservation of soil of Lviv region

2013 ◽  
pp. 292-303
Author(s):  
S. Pozniak ◽  
V. Haskevich ◽  
M. Pshevlotsky ◽  
O. Teleguz
Keyword(s):  
Key Words ◽  
Environmental Conditions ◽  
Power Plants ◽  
Wind Erosion ◽  
The Other ◽  
Soil Protection ◽  
Agricultural Crops ◽  
Ecological State ◽  
Ecological Situation ◽  
Rational Use

The article analyzes the agro-ecological situation and problems of soil use in Lviv region. It is established that the conduct of agriculture is often not the landscape and environmental conditions of the area and agro-ecological conditions of cultivation of agricultural crops. In soils have become widespread degradation processes, such as water and wind erosion, acidification, dehumidification, the depletion of elements of the other power plants. The measures of rational use and protection of soils are proposed. Key words: Lviv region, soil, agro-ecological state of, degradation, soil protection.

scholarly journals Conditioning in the promotion and uniformization of Umbu seed germination

2018 ◽  
Vol 40 (1) ◽  
Author(s):  
Renato Teo Barros ◽  
Cibele Chalita Martins ◽  
Francisco Elder Carlos Bezerra Pereira ◽  
Givanildo Zildo da Silva
Keyword(s):  
Electrical Conductivity ◽  
Seed Germination ◽  
Water Content ◽  
Environmental Conditions ◽  
Seed Quality ◽  
Germination Rate ◽  
Ambient Conditions ◽  
Germination Test ◽  
Mean Germination Time ◽  
Cold Chamber

Abstract Seed dormancy may decrease during storage and some environmental conditions may accelerate this process. The aim of this work was to determine efficient techniques to condition umbu seeds in order to promote and standardize their germination. Seeds were stored for 180 days in paper bags kept in five ambient conditions: laboratory (25 ºC and 55% RH); warm oven (40 °C and 53% RH); hot oven (50 °C and 49% RH); dry chamber (18 °C and 65% RH) and cold chamber (10 °C and 65% RH). Seed quality was evaluated every 60 days by means of the following tests and determinations: water content; germination test (25 °C and 55% RH, weekly evaluated up to 91 days after sowing); first count test (14 days); germination rate index; mean germination time and electrical conductivity. The conditioning of umbu seeds in laboratory, or in warm oven (40 ºC) used efficient techniques to promote and standardize germination; under these conditions, after six months of storage, germination increased from 31% to 84 and 74%, respectively.

Sign in / Sign up

Export Citation Format

Share Document