Добірка наукової літератури з теми "Freezer plant"

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Статті в журналах з теми "Freezer plant":

1

Quamme, H. A., H. M. Mathers, and R. T. Brownlee. "A procedure for converting an ultra-low temperature freezer for freezing biological material." Canadian Journal of Plant Science 71, no. 4 (October 1, 1991): 1281–83. http://dx.doi.org/10.4141/cjps91-179.

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A plan for a precise temperature-controlled freezing chamber for studying plant freezing responses to temperatures between 0° and −70 °C is described. The chamber is especially useful for conducting biological freezes requiring slow freeze-thaw rates and rapid response times. Key words: Ultra-low temperature freezer, controlled freezing chamber
2

Parthasarathy, M. V., Carole Daugherty, and T. Müller. "Jet freezing of cells and tissues with and without cryoprotectants." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 106–7. http://dx.doi.org/10.1017/s0424820100146370.

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For the past several years cryofixation/freeze-substitution techniques have become valuable alternatives to chemical fixation of biological specimens. The superiority of cryofixation in preserving labile cell structures has been documented in several studies. Commercially available jet freezers and the BAL-TEC HPM010 high pressure freezer have extended high quality cryofixation from monolayer cells to cells relatively deep inside tissues. High pressure freezing can theoretically freeze biological materials of 0.5 mm thickness without the use of cryoprotectants and propane jet freezing is reported to freeze biological samples up to 40 μm in thickness without cryoprotection. Although high pressure freezing is the obvious method of choice for freezing large biological samples, its high cost combined with its apparent inability to consistently preserve microfilaments in some plant cells has prompted us to explore the capability of jet freezing to yield well frozen samples with and without cryoprotectants.We used the commercially available jet freezer JFD 030 (BAL-TEC) to obtain our results. Tightly pelleted cells sandwiched between 0.1 mm thick copper specimen carriers normally froze well without any cryoprotectants, after propane jet freezing (Figs. 1-2).
3

Ding, Biao, Robert Turgeon, and M. V. Parthasarathy. "Cytoskeleton in tobacco plant cells after propane jet freezing and freeze substitution." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 3 (August 12, 1990): 704–5. http://dx.doi.org/10.1017/s0424820100161072.

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Microfilaments in plant cells are very labile and in some cells difficult to preserve by chemical fixation. Single microfilaments are even more labile and are rarely preserved. Cryofixation is so far the best means to preserve these labile cellular components for electron microscopy. However, previous studies only dealt with single plant cells because of the shallow depth of good freezing limited by the technique (plunge freezing). Here we report our results of preserving cytoskeleton in plant leaf and root cells using propane jet freezing and freeze substitution.Tobacco (Nicotiana tabacum L. var. Maryland Mammoth) plants were grown under greenhouse conditions. A developing leaf was cut from a two-month old plant and immersed in a 0.2 M sucrose solution containing 20 mM MES, 20 mM CaCl2 and 20 mM KCl. Samples of 1 mm2 were cut out of the leaf and incubated for 10 to 30 minutes. The leaf samples were then frozen in a commercial propane jet-freezer (Model MF7200, KMC, Tucson, Arizona).
4

Turner, J. M., K. K. Tanino, and C. Stushnoff. "Evaluation of low temperature hardiness of strawberry plants under field and controlled conditions." Canadian Journal of Plant Science 73, no. 4 (October 1, 1993): 1123–25. http://dx.doi.org/10.4141/cjps93-151.

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When acclimated strawberry plants (Fragaria × ananassa Duch. ’Redcoat’) from the field were placed in a programmable freezer, mother strawberry crowns were as hardy or hardier than daughter crowns when frozen to −11 °C. However, under field conditions, daughter plants expressed consistently greater hardiness than mother plants. Mulching had no effect on daughter plant survival, whereas enhanced mother plant survival was observed. Field-growth habit of mother crowns may be the important factor for consistent winter survival under prairie conditions. A simple scoring system was developed to predict survival of strawberry plants. Key words. Fragaria × ananassa Duch., strawberry, crowns, low temperature hardiness
5

Tiryaki, Iskender, and Mustafa Topu. "A Novel Method to Overcome Coat-Imposed Seed Dormancy in Lupinus albus L. and Trifolium pratense L." Journal of Botany 2014 (August 3, 2014): 1–6. http://dx.doi.org/10.1155/2014/647469.

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We have developed a novel method to overcome coat-imposed seed dormancy in legume plants. Seeds of Lupinus albus L. and Trifolium pratense L. were stored in a freezer at −80°C for a period of time and then immediately treated with or without hot water at 90°C for 5 seconds. Germination tests were carried out in darkness at 20±1.0°C with four replications in a completely randomized design. Final germination percentage (FGP), germination rate, and synchrony of seeds were evaluated. The results showed that new approach of freeze-thaw scarification provided high percentage of germinations in white lupin (84.16%) and red clover (74.50%) seeds while control seeds had FGPs of 3.3% and 26.0%, respectively. The immediate thawing of frozen seeds in hot water for 5 seconds was found not only an effective and reliable but also the quickest seed treatment method to prevail against coat-imposed seed dormancy in legume species and may become operationally applicable to other plant species.
6

Davis, Anthony S., and Martin-Michel Gauthier. "Portable refrigerator | freezer provides stable temperature for plant material collection." Native Plants Journal 9, no. 1 (April 2008): 40–44. http://dx.doi.org/10.2979/npj.2008.9.1.40.

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7

Brochmann, Christian, and Anne K. Brysting. "The Arctic – an evolutionary freezer?" Plant Ecology & Diversity 1, no. 2 (November 24, 2008): 181–95. http://dx.doi.org/10.1080/17550870802331904.

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8

Hanaa, H., and E. Ali. "Agronomic performance of seven pea (Pisum sativum) genotypes with five sowing dates in sandy soil." Acta Agronomica Hungarica 59, no. 4 (December 1, 2011): 337–47. http://dx.doi.org/10.1556/aagr.59.2011.4.5.

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A field experiment was conducted at the Agriculture Faculty Farm of Sebha University during the 2007/2008 and 2008/2009 winter seasons to study the agronomic performance of seven pea genotypes with different sowing dates in sandy soil. The experiment was laid out in a randomized complete block design (RCBD) using a split-plot arrangement with three replicates. The five sowing dates (30 October, 15 November, 30 November, 15 December and 30 December) were assigned to the main plots, while the seven pea genotypes (Ambassador, Pollon, MG130256, G22765-2c, 89-P-109-11, No. 252, Victory Freezer and Master B) were allocated to the sub-plots. The sowing dates had a significant effect on all the studied traits except seed protein content in both seasons. Early sowing (15 November) was better than the other sowing dates for all the traits except 100-seed weight. There were significant differences between the pea genotypes for all the traits in the two growing seasons. The Victory Freezer genotype surpassed the other genotypes for all traits except number of branches plant-1 in the second season, 100-seed weight and seed protein content. The highest values for number of branches plant−1 in the second season and for seed protein content were obtained for the G22765-2c genotype, while the maximum values of 100-seed weight were recorded for the MG130256 genotype. A significant interaction between sowing dates and pea genotypes was detected for the length of the period from emergence to initial flowering, number of pods plant−1, seed yield plant−1 and seed yield ha-1 in both seasons. The longest period from emergence to initial flowering was obtained for the Victory Freezer pea variety sown on 30 November, while the highest values of pods plant−1, seed yield plant−1 and seed yield ha−1 were gained by sowing the Victory Freezer pea genotype on 15 November.
9

Cruz, Juliana Cristina Sodário, Nilton Luiz de Souza, Carlos Roberto Padovani, and Edson Luiz Furtado. "Preservação do inóculo de Plasmodiophora brassicae utilizando o método de congelamento." Summa Phytopathologica 35, no. 1 (February 2009): 57–59. http://dx.doi.org/10.1590/s0100-54052009000100010.

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A preservação das estruturas de resistência de Plasmodiophora brassicae, em condições laboratoriais, é dificultada pelo fato de se tratar de um parasita obrigatório. O método de congelamento, utilizando freezer, comum foi testado com o objetivo de viabilizar a sobrevivência e a preservação de suas características infectivas. Raízes de diferentes brássicas, naturalmente infectadas por P. brassicae, contendo sintomas típicos de hérnia, de uma mesma propriedade localizada no município de Pardinho, Estado de São Paulo, foram coletadas em diferentes épocas e imediatamente congeladas, em freezer, a aproximadamente -20ºC. Os tratamentos foram divididos da seguinte maneira: T1: hérnias congeladas por 389 dias (rúcula); T2: hérnias congeladas por 242 dias (brócolis); T3: hérnias congeladas por 21 dias (couve chinesa) e T4: testemunha (sem inóculo). Os testes de patogenicidade, após diferentes períodos de armazenamento, foram realizados em condições de casa de vegetação (25±2ºC). Cada planta de uma variedade suscetível de couve-chinesa (Pak choi) foi inoculada com 2mL da suspensão de esporos de cada tratamento, na concentração de 10(7) esporos.mL-1. Cada tratamento contou com seis repetições distribuídas em blocos ao acaso. Passadas cinco semanas após a inoculação, as raízes das plantas foram lavadas e avaliadas. Houve diferença significativa entre os tratamentos. Os materiais congelados, entre 21 a 242 dias preservaram suas características infectivas, mostrando que o método de congelamento em freezer, nesse período, pode ser uma boa opção para a preservação das estruturas de resistência deste patógeno.
10

Hawkins, C. D. B., M. J. Aston, and M. I. Whitecross. "Aphid-induced changes in growth indices of three leguminous plants: unrestricted infestation." Canadian Journal of Botany 63, no. 12 (December 1, 1985): 2454–59. http://dx.doi.org/10.1139/b85-351.

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The effects of various densities of cowpea aphids (Aphis craccivora Koch) and pea aphids (Acyrthosiphon pisum Harris), both Homoptera: Aphididae, on the growth of cowpea (Vigna unguiculata (L.) Walp. cv. Caloona), broad bean (Vicia faba L. cv. Aquadulce), and garden pea (Pisum sativum L. cv. Victory Freezer) seedlings were investigated. Within 10 days of infestation, aphid feeding significantly reduced plant dry weights and mean relative growth rates for the six plant–aphid combinations. In all cases except one, the mean unit leaf or net assimilation rate was also significantly reduced within 10 days. The mean leaf area ratio was the same for infested and control plants. The aphid-induced changes in host plants appear to be due to changes in photosynthesis, respiration, and translocate removal from the phloem over the 10-day period. Changes in the growth patterns of the host plant within this period are similar, but the underlying physiological effects could vary among particular plant–aphid combinations.

Дисертації з теми "Freezer plant":

1

Byass, Louise Jane. "Characterization of plant anti-freeze proteins." Thesis, University of York, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310913.

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2

Ausmeel, Erik, and Botvid Gannholm. "Dataanalys av en ny avfrostningsrutin på en kyl- och frysanläggning : En studie gjord hos Freezing Food Småland Öland AB." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-105008.

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Den här rapporten handlar om en ändring i livsmedelsföretaget Freezing Food Småland Öland AB:s avfrostningsrutin för deras förångare i frysrummet. Ändringen gick ut på att avfrostningstiden och maxtemperaturen sänktes samt att tiden mellan avfrostningarna nu sker varannan i stället för varje natt. Syftet var att undersöka om ändringen av rutinen hade bidragit till en minskad energiförbrukning i förhållande till innan ändringen gjordes genom att också granska andra faktorer än själva avfrostningen som kunde tänkas påverka energiförbrukningen. Metoden gick ut på att insamla och analysera stora datamängder tillhandahållna av företaget för att sedan reducera dem till hanterbara siffror. Även data för lokala utomhustemperaturer samlades in. Med hjälp av detta beräknades medelvärden för en given tidsperiod för energiförbrukning, lagerhållning och utomhustemperatur. Resultatet visade en sänkning av energiförbrukningen, hur stor andel som berodde på avfrostningens ändrade rutiner lämnade undersökningen obesvarat. Utomhustemperaturen bör ha minskat effektbehovet, samtidigt bör lagerhållningen ökat den. Slutsatsen blev att mer tid behövde passera och en ny undersökning behöver framställas efter att avfrostningsrutinen ändrades för att möjliggöra en säkrare bedömning.
This report is about a change in the food company Freezing Food Småland Öland AB’s defrosting routine for their evaporators in the freezer warehouse. The change was that the defrosting time and maximum temperature were reduced and that the time between defrostings now takes place every other night instead of every night. The aim was to examine whether the change in the routine had contributed to a reduction in energy consumption compared to before the change was made by also examining factors other than defrosting itself that might affect energy consumption. The method was to collect and analyze large amounts of data provided by the company and then reduce them to manageable figures. Data for local outdoor temperatures were also collected. This calculated averages for a given time period for energy consumption, warehousing and outdoor temperature. The results showed a decrease in energy consumption, the proportion due to the change in defrosting procedures left the investigation unanswered. The outdoor temperature should have reduced the power requirement, at the same time the storage should have increased it. It was concluded that more time needed to pass,and a new study needed to be produced after the defrosting routine was changed to allow for a safer assessment.
3

Schuch, Ursula K., Jack J. Kelly, and Steve Priebe. "Damage on Ornamental Landscape Plants Resulting from the January 2007 Freeze in Arizona." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2008. http://hdl.handle.net/10150/216641.

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Severe freezing temperatures during January 2007 caused temporary and permanent damage in several species of ornamental landscape plants. The damage was exacerbated by three consecutive nights of frost and freezing temperatures lasting between 7and 14 hours each day. Observations of frost damage and recovery in Phoenix and Tucson were recorded.
4

Johnson, Matthew B. "Summary of the February Freeze and Effects on Plants in DELEP's Tucson Fields." University of Arizona (Tucson, AZ), 2011. http://hdl.handle.net/10150/556785.

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5

Obasa, Kehinde Christopher. "Ecology and management of large patch of zoysiagrass, caused by Rhizoctonia solani AG 2-2 LP." Diss., Kansas State University, 2012. http://hdl.handle.net/2097/13608.

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Doctor of Philosophy
Department of Plant Pathology
Megan Kennelly
Large patch, caused by the fungus Rhizoctonia solani anastomosis group (AG) 2-2 LP, is the most common and severe disease of zoysiagrass (Zoysia spp). Despite the importance of this disease, few studies have examined pathogen biology, cultivar susceptibility, cultural controls, and chemical controls. The objectives of this dissertation were: (1) Characterize large patch isolates based on anastomosis pairing, in-vitro mycelial growth rates, nuclear counts, virulence, PCR, and amplified fragment length polymorphism (AFLP); (2) Determine the effects of cultivation (aerification, verticutting, and sand topdressing) on disease severity; (3) Evaluate different fall and spring applications of the fungicides flutolanil, azoxystrobin, and triticonazole; (4) Evaluate the susceptibility of fifteen new zoysiagrass germplasm lines from parental crosses including Z. japonica, Z. matrella, and Z. pacifica. All the R. solani isolates from large patch-infected zoysiagrass from Kansas belonged to AG 2-2 LP. Variations were observed among the isolates in their average number of nuclei per cell, mycelial growth rates and virulence. There was also variation in the amplified fragment length polymorphism (AFLP) DNA fingerprints, suggesting possible underlying genetic differences of biological significance among members of AG 2-2 LP. Cultivation did not affect soil moisture or temperature. Cultivation also did not reduce patch sizes, nor influence turf recovery rate from large patch. From 2009 to 2011, spring and fall N fertility was consistently associated with lower percentages of diseased turf in both cultivated and non-cultivated plots at Manhattan and Haysville. In general, two fall applications of fungicide did not reduce disease compared to one fall application. Fungicides applied in the fall when thatch temperatures ranged from 17.8oC to 23.2oC reduced disease compared to untreated controls. Early spring applications reduced disease compared to later spring applications. In germplasm screening studies, all progeny had similar disease levels compared to Meyer in the growth chamber, but only 6 consistently had disease levels as low as Meyer in the field. Growth chamber results did not correlate to field results.
6

Verrelli, D. I. "Drinking water treatment sludge production and dewaterabilityф". D. I. Verrelli, 2008. http://repository.unimelb.edu.au/10187/3521.

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The provision of clean drinking water typically involves treatment processes to remove contaminants. The conventional process involves coagulation with hydrolysing metal salts, typically of aluminium (‘alum’) or trivalent iron (‘ferric’). Along with the product water this also produces a waste by-product, or sludge. The fact of increasing sludge production — due to higher levels of treatment and greater volume of water supply — conflicts with modern demands for environmental best practice, leading to higher financial costs. A further issue is the significant quantity of water that is held up in the sludge, and wasted.
One means of dealing with these problems is to dewater the sludge further. This reduces the volume of waste to be disposed of. The consistency is also improved (e.g. for the purpose of landfilling). And a significant amount of water can be recovered. The efficiency, and efficacy, of this process depends on the dewaterability of the sludge.In fact, good dewaterability is vital to the operation of conventional drinking water treatment plants (WTP’s). The usual process of separating the particulates, formed from a blend of contaminants and coagulated precipitate, relies on ‘clarification’ and ‘thickening’, which are essentially settling operations of solid–liquid separation.WTP operators — and researchers — do attempt to measure sludge dewaterability, but usually rely on empirical characterisation techniques that do not tell the full story and can even mislead. Understanding of the physical and chemical nature of the sludge is also surprisingly rudimentary, considering the long history of these processes.
The present work begins by reviewing the current state of knowledge on raw water and sludge composition, with special focus on solid aluminium and iron phases and on fractal aggregate structure. Next the theory of dewatering is examined, with the adopted phenomenological theory contrasted with empirical techniques and other theories.The foundation for subsequent analyses is laid by experimental work which establishes the solid phase density of WTP sludges. Additionally, alum sludges are found to contain pseudoböhmite, while 2-line ferrihydrite and goethite are identified in ferric sludges.
A key hypothesis is that dewaterability is partly determined by the treatment conditions. To investigate this, numerous WTP sludges were studied that had been generated under diverse conditions: some plant samples were obtained, and the remainder were generated in the laboratory (results were consistent). Dewaterability was characterised for each sludge in concentration ranges relevant to settling, centrifugation and filtration using models developed by LANDMAN and WHITE inter alia; it is expressed in terms of both equilibrium and kinetic parameters, py(φ) and R(φ) respectively.This work confirmed that dewaterability is significantly influenced by treatment conditions.The strongest correlations were observed when varying coagulation pH and coagulant dose. At high doses precipitated coagulant controls the sludge behaviour, and dewaterability is poor. Dewaterability deteriorates as pH is increased for high-dose alum sludges; other sludges are less sensitive to pH. These findings can be linked to the faster coagulation dynamics prevailing at high coagulant and alkali dose.Alum and ferric sludges in general had comparable dewaterabilities, and the characteristics of a magnesium sludge were similar too.Small effects on dewaterability were observed in response to variations in raw water organic content and shearing. Polymer flocculation and conditioning appeared mainly to affect dewaterability at low sludge concentrations. Ageing did not produce clear changes in dewaterability.Dense, compact particles are known to dewater better than ‘fluffy’ aggregates or flocs usually encountered in drinking water treatment. This explains the superior dewaterability of a sludge containing powdered activated carbon (PAC). Even greater improvements were observed following a cycle of sludge freezing and thawing for a wide range of WTP sludges.
Further aspects considered in the present work include deviations from simplifying assumptions that are usually made. Specifically: investigation of long-time dewatering behaviour, wall effects, non-isotropic stresses, and reversibility of dewatering (or ‘elasticity’).Several other results and conclusions, of both theoretical and experimental nature, are presented on topics of subsidiary or peripheral interest that are nonetheless important for establishing a reliable basis for research in this area.
This work has proposed links between industrial drinking water coagulation conditions, sludge dewaterability from settling to filtration, and the microstructure of the aggregates making up that sludge. This information can be used when considering the operation or design of a WTP in order to optimise sludge dewaterability, within the constraints of producing drinking water of acceptable quality.
7

Lin, Yung-Shun, and 林郁舜. "Study on Cultiration of Green Bean Sprouts with Freezer Container as Plant Factory." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/52220305048550252243.

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碩士
國立屏東科技大學
生物機電工程系所
101
In early stage, greenhouse and plant factories are mostly firmly fixed to the floor. Unable to move, to be moved it must be carried out throughout the greenhouse or plant factory dismantled, and then re-build on new regional. Resulting many greenhouse and plant factory unsuitable, to be replaced location was a problem. The purpose of the study is remodel a cultivation facility systems on the refrigerated containers. Containers in the freezer for sprouts cultivation experiments. Suitable for the cultivation of bean sprouts in the freezer container production, because bean sprouts cultivation without illumination. The results show that cultivation facilities systems, helping many areas not suitable for cultivation of vegetables. That can take advantage of this system to cultivate bean sprouts solve problems.
8

Yang, Jhe-an, and 楊喆安. "Environmental Control Plant Box Mushrooms Cultivation and Application of Vacuum Freeze Drying." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/e25t3g.

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碩士
國立勤益科技大學
冷凍空調系
106
Mushrooms have been one of extensively edible food, the drug effect and ingredients have been validated in related academic theses. Different mushrooms are characterized by rich fibers and low heat content. This study aims to build ideal conditions, looks for the optimal growth temperature and humidity for different mushrooms, and checks which variables influence the growth of mushrooms most significantly, so as to establish the optimal growth curve. The mushroom spawn-run temperature is set as 24℃~26℃, the humidity is 60%~70%, the spawn-run takes about 45 days. When the hyphae spread over the cultivation waste bag completely, meaning the spawn-run is finished. This experiment uses 18℃, RH80%~90% and 20℃, RH80%~90% to compare the growth temperatures. The common ground is that the mushroom will not grow out 2 days~3 days before the spawn-run is completed, but there is fast growth stage, the duration is 12 days~13 days, the optimal growth height at 18℃ (mushroom cap not turned up) is about 18cm, the optimal growth height at 20℃ is about 15cm, meaning low temperature growth can prolong the almond abalone mushroom growth time, the length is increased. The moisture content becomes stable in 5HR of vacuum drying and vacuum freeze drying experiments, the moisture content is 10%~15%, the minimum value is 3.8%. According to the experimental results, the minced forms have the lowest moisture content, which are 0.2cm, 0.4cm, 0.6cm and 0.8cm. According to this experiment, the minced dry area accounts for the largest proportion of volume, so the moisture content after drying is lower. Therefore, the dry area accounts for larger proportion of volume (1/cm), the moisture content is more likely to be lower.
9

Chu, Shao-ting, and 褚紹廷. "Environmental Control Plant Box Okra Cultivation and Application of Vacuum Freeze Drying." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/wtqa4q.

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Анотація:
碩士
國立勤益科技大學
冷凍空調系
106
Human body has an organ which is called pancreas. One function of pancreas is to secrete insulin to reduce blood sugar. When the pancreas fails to control the blood sugar within normal range, the diabetes is induced. The mucilage and abundant soluble dietary fiber of okra can prevent the carbohydrate in intestinal tract from being digested, so as to reduce the absorption of glucose. Added to this, the mucous membrane of okra can protect the gastric wall, and the calcium content and absorptivity are higher than milk. This study uses intelligent environmental control planting system to plant okra, an environment suitable for planting okra is built, protecting crops against superheat or supercool, and protecting plants from cold damage, disease and insect damage. This study uses vacuum freeze drying method to dry okra, the moisture content after drying is recorded, and the methods to increase drying rate and shorten drying time are found out of different experimental methods. According to the vacuum freeze drying experiment, when the whole okra fruit is dried, the moisture content is as high as 69.3%, cut up into 1 cm piece, the moisture content is 11.3%, and cut up into 0.6 cm piece, the moisture content is 12.1%. The results show that the vacuum freeze drying after slicing can reduce the moisture content greatly. The same drying experiment is conducted at the okra prefreezing temperature -30℃ and prefreezing temperature -20℃. The okra at prefreezing temperature -30℃ has higher moisture content, meaning the final moisture content is poor if the prefreezing temperature is lower than the eutectic point too much. In the case of the same total drying time, the experimental results show that the end temperature heat drying has great effect on okra. The longer the end temperature heat drying distribution time is, the lower is the moisture content. Because it is difficult to remove the bound water in okra tissues during sublimation drying.
10

Arora, Rajeev. "Studies of membrane perturbations following a freeze-thaw cycle in herbaceous plant species." 1990. http://catalog.hathitrust.org/api/volumes/oclc/22698579.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1990.
Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Книги з теми "Freezer plant":

1

Potter, Brian E. A climatology of late-spring freezes in the Northeastern United States. St. Paul, Minn: U.S. Dept. of Agriculture, Forest Service, North Central Research Station, 1999.

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Potter, Brian E. A climatology of late-spring freezes in the Northeastern United States. St. Paul, Minn: U.S. Dept. of Agriculture, Forest Service, North Central Research Station, 1999.

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3

Potter, Brian E. A climatology of late-spring freezes in the Northeastern United States. St. Paul, Minn: U.S. Dept. of Agriculture, Forest Service, North Central Research Station, 1999.

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4

Yin, Weilun, and Mingpu Zhai. Nan fang di wen yu xue bing dong de lin ye zai hai yu fang zhi dui ce yan jiu. 8th ed. Beijing: Zhongguo huan jing ke xue chu ban she, 2010.

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5

Art, Freer Gallery of. Islamic metalwork in the Freer Gallery of Art. Washington, D.C: The Gallery, Smithsonian Institution, 1985.

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6

Clarke, Andrew. Freezing. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199551668.003.0006.

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Freezing is a widespread ecological challenge, affecting organisms in over half the terrestrial environment as well as both polar seas. With very few exceptions, if a cell freezes internally, it dies. Polar teleost fish in shallow waters avoid freezing by synthesising a range of protein or glycoprotein antifreezes. Terrestrial organisms are faced with a far greater thermal challenge, and exhibit a more complex array of responses. Unicellular organisms survive freezing temperatures by preventing ice nucleating within the cytosol, and tolerating the cellular dehydration and membrane disruption that follows from ice forming in the external environment. Multicellular organisms survive freezing temperatures by manipulating the composition of the extracellular body fluids. Terrestrial organisms may freeze at high subzero temperatures, often promoted by ice nucleating proteins, and small molecular mass cryoprotectants (often sugars and polyols) moderate the osmotic stress on cells. A range of chaperone proteins (dehydrins, LEA proteins) help maintain the integrity of membranes and macromolecules. Thermal hysteresis (antifreeze) proteins prevent damaging recrystallisation of ice. In some cases arthropods and higher plants prevent freezing in their extracellular fluids and survive by supercooling. Vitrification of extracellular water, or of the cell cytosol, may be a more widespread response to very cold temperatures than recognised to date.
7

Schoellkopf, R. S. Power Plant Electrical Reference Series Volume 12: Electric Freeze Protection and Process Heating. Electric Power Research Institute, 1987.

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8

Leap, skip, twist and freeze: Lesson plans for children's creative dance. East Lansing, Mi: Michigan Dance Association, 1986.

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9

Kate, O'Neill, and Michigan Dance Association, eds. Leap, skip, twist and freeze: Lesson plans for children's creative dance. East Lansing: Michigan Dance Association, 1986.

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10

L, Johnson R., Alberta. Oil Sands Reclamation Research Program, and Alberta Conservation and Reclamation Council, eds. Oil sands sludge dewatering by freeze-thaw and evapotranspiration. Edmonton, Alta: Alberta Conservation and Reclamation Council (Reclamation Research Technical Advisory Committee), 1993.

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Частини книг з теми "Freezer plant":

1

Dijkstra, Jeanne, and Cees P. de Jager. "Freeze-Drying." In Practical Plant Virology, 198–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72030-7_38.

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2

Schumacher, Heinz Martin, Martina Westphal, and Elke Heine-Dobbernack. "Cryopreservation of Plant Cell Lines." In Cryopreservation and Freeze-Drying Protocols, 423–29. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-2193-5_21.

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3

Grout, Brian W. W. "Cryopreservation of Plant Cell Suspensions." In Cryopreservation and Freeze-Drying Protocols, 153–61. Totowa, NJ: Humana Press, 2007. http://dx.doi.org/10.1007/978-1-59745-362-2_11.

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4

Senula, Angelika, and Manuela Nagel. "Cryopreservation of Plant Shoot Tips of Potato, Mint, Garlic, and Shallot Using Plant Vitrification Solution 3." In Cryopreservation and Freeze-Drying Protocols, 647–61. New York, NY: Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0783-1_35.

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5

Schumacher, Heinz Martin, Martina Westphal, and Elke Heine-Dobbernack. "Cryopreservation of Plant Cell Lines Using Alginate Encapsulation." In Cryopreservation and Freeze-Drying Protocols, 639–45. New York, NY: Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0783-1_34.

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6

Hoch, H. C. "Preservation of Cell Ultrastructure by Freeze-Substitution." In Electron Microscopy of Plant Pathogens, 1–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-75818-8_1.

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7

Schilling, Silke M., Hany A. M. Sror, Dirk K. Hincha, Jürgen M. Schmitt, and Carsten A. Köhn. "Cryoprotectin, A Cabbage Protein Protecting Thylakoids from Freeze-Thaw Damage." In Plant Cold Hardiness, 195–210. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-0711-6_14.

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8

Hincha, Dirk K., Frank Sieg, and Jürgen M. Schmitt. "Protection of Thylakoid Membranes from Freeze-Thaw Damage by Proteins." In Plant Cold Hardiness, 143–52. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4899-0277-1_13.

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9

Uemura, Matsuo, and Peter L. Steponkus. "Effect of Cold Acclimation on Membrane Lipid Composition and Freeze-Induced Membrane Destablization." In Plant Cold Hardiness, 171–79. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4899-0277-1_15.

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10

Fitzgerald, M. A., D. M. Calder, and R. B. Knox. "Secretory events in the freeze-substituted tapetum of the orchid Pterostylis concinna." In Plant Systematics and Evolution, 53–62. Vienna: Springer Vienna, 1993. http://dx.doi.org/10.1007/978-3-7091-6661-1_5.

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Тези доповідей конференцій з теми "Freezer plant":

1

Mandal, Ashok. "Increasing freezing tolerance in winter cala by reducing deacclimation impact on freeze survival." In ASPB PLANT BIOLOGY 2020. USA: ASPB, 2020. http://dx.doi.org/10.46678/pb.20.1007236.

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2

Song, Yu, Arnesh Das, David A. Lange, Hossein Mosavi, and Kyle Riding. "A Performance-Based Approach to Concrete Freeze-Thaw Durability." In 2018 Joint Rail Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/jrc2018-6167.

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Concrete railroad ties can experience deterioration from freezing and thawing in cold climates typical to many railroads. Materials and manufacturing processes used to make concrete railroad ties can be controlled to give ties a long period of frost immunity. A performance-based criterion for selection of concrete materials and durability requirements would allow plants more flexibility in material selection and improve overall performance in the field. A new performance-based approach is described to concrete freeze-thaw quality control. In order to accommodate implementation, work was performed at a precast concrete railroad tie manufacturing plant to compare currently used concrete freeze-thaw quality control methods to the proposed performance-based method. This comparison is described to illustrate the benefits of this new performance-based approach.
3

Boy, Virginie, Lubana Al-Sayed, Emmanuel Madieta, Emira Mehinagic, and Jean-Louis Lanoisellé. "Pulsed Electric Fields (PEF) as pre-treatment for freeze-drying of plant tissues." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7484.

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The influence of pulsed electric fields (PEF) treatment on freeze-drying for potato and strawberry tissues was investigated. Samples were pre-treated by PEF ( 400 V cm-1) for different treatment times. Freeze-drying was carried out at -17°C and 18.4 Pa or 30 Pa for potato and strawberry tissues, respectively. The effects of PEF pre-treatment was compared with intact samples. The drying time was reduced by 35% for potato and 30% for strawberry. The sample rehydration capacity and the electrolytes released during the rehydration were higher for pre-treated samples. Strawberries texture was characterized by the hardness, the cohesiveness and the springiness.Keywords: Pulsed Electric fields; Freeze-drying; Potato; Strawberry; Textural Properties.
4

Valeriu Iancu, Valeriu, Laura Adriana Bucur, Verginica Schröder, and Manuela Rossemary Apetroaei. "PRELIMINARY STUDIES RELATED TO MICROSCOPY AND THE SEDEM EXPERT SYSTEM PROFILE ON FREEZED-DRIED EXTRACT OF LYTHRI HERBA." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/16.

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"The floral tips of the plant species Lythrum salicaria L. represent a rich source of total polyphenols, among which with the largest share we mention tannins, and this is why this plant material has a standardized monograph in the European Pharmacopoeia 10.0th edition. According to the literature accessed so far, the plant material has antioxidant, anti-inflammatory, hemostatic, antibacterial and antifungal properties, along with modulatory action on carbohydrate metabolism. Powder microscopic examination is an important step in establishing the identity of the plant species used, highlighting elements specific to the aerial part such as spiral vessels of the stem, fragments of the spongy mesophyll with calcium oxalate clusters cells and anomocytic stomata. The application of the SeDeM method on dried plant extracts represents an innovative trend in pharmaceutical technology and contributes to the collection of data in a structured and standardized form. In this paper, the functions and applications of the SeDeM expert system are illustrated upon the freeze-dried extract of Lythri herba for the purpose of easier identification and standardization. Future applications may include obtaining chewable gums or tablets by direct compression."
5

Barresi, Antonello A., and Roberto Pisano. "Process intensification and process control in freeze-drying." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7652.

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Widespread use of advanced process control allows reduction of costs, by reducing drying time and energy consumption. The “control of the freezing stage” (by forced nucleation) also appears to be beneficial to process intensification, as it can impact the product structure and modify the product resistance to mass transfer. An alternative way to increase the drying rate is the use of organic solvents as they can lead to larger solvent crystals, hence lower product resistance to vapor flow. Atmospheric freeze-drying may be a good alternative to vacuum freeze-drying, as a way of increasing process efficiency. A further improvement can be obtained by combining atmospheric or vacuum freeze-drying with new technologies. A further step towards process intensification is given by continuous plants, as this allows a dramatic increase in throughput and product quality uniformity. Keywords: freeze-drying; process intensification; controlled nucleation; continuous process.
6

Maywald, P. V., and D. K. Beale. "Development of a Freejet Capability for Evaluating Inlet-Engine Compatibility." In ASME 1991 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/91-gt-401.

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The Arnold Engineering Development Center (AEDC) is installing a freejet test capability into the Aero-propulsion Systems Test Facility (ASTF). The freejet will provide the capability for ground determination of turbine engine and aircraft inlet compatibility by utilizing full-scale inlets and engines as test articles in a simulated flight environment. The details of the design, installation, and projected testing capability are described for a 57 ft2 supersonic nozzle and a 77 ft2 subsonic nozzle. Support systems for mechanically pitching and yawing the freejet nozzles are also reported as well as the test cell hardware for capturing the freejet nozzle flow. The plans for demonstrating the freejet capability prior to its initial operational date are explained. The technology development efforts to validate and utilize the freejet test capabilities are also described.
7

Kelly, Bruce, Henry Price, Doug Brosseau, and David Kearney. "Adopting Nitrate/Nitrite Salt Mixtures as the Heat Transport Fluid in Parabolic Trough Power Plants." In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36172.

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The present generation of commercial parabolic trough solar power plant uses a synthetic oil as the heat transport fluid in the collector field. The plants are currently operating at the upper temperature limit of the fluid, and further improvements in the solar-to-electric conversion efficiency are likely to be incremental. In contrast, adoption of a nitrate salt, or a nitrate/nitrite salt, mixture as the heat transport fluid would allow the collector field outlet temperature to increase by 50 to 100 °C, which translates into an increase in the gross Rankine cycle efficiency from the present 37.5 percent to new values in the range of 40 to 41 percent. Further, the low cost and the low vapor pressure of the candidate salt mixtures allow the heat transport fluid to also act as the storage medium in a thermal storage system. Using a salt mixture in the collector field should reduce the unit cost of thermal storage by approximately half compared to the current indirect designs. The principal, and far from minor, liability of the candidate salt mixtures are freezing points in the range of 120 °C to 220 °C. As a consequence, all salt components, including the collector field, will require some form of electric heating for freeze protection. Further, collector designs will need to be demonstrated, or developed, which are tolerant of a limited number of freeze/thaw cycles. The candidate salts are also corrosive to the current ball joint sealing materials. This paper outlines the problems which need to be solved before a commercial salt project could reasonably be considered by a project developer, the elements of a test and demonstration program to solve the problems, and the contributions which will be necessary from the salt component vendors, the project developers, and the financial community.
8

Seshadri, Parthasarathy, and Zakiul Kabir. "Steady State and Transient Modeling of a PEM Fuel Cell Power Plant for Transportation Applications." In ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2005. http://dx.doi.org/10.1115/fuelcell2005-74108.

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UTC Fuel Cells recently developed a freeze capable fuel cell power plant for automotive applications. Steady state and dynamic system models were developed for design and performance characterization. The results of the power plant performance testing indicate very good agreement with these models. Testing showed that the power plant achieves stable performance at all power levels including low power holds. UTC Fuel Cells’ cell stack technology enables operation of the power plant at near-ambient pressure. Additionally the low system pressure drop allows the power plant to achieve very high electrical efficiencies at all power levels. The peak efficiency is about 58% at approximately 20% of rated power. Since the power plant does not require compressors, the auxiliary power requirement and acoustic noise level for the system are also low. The cell stack’s capability of internal water management and ability to operate at low reactant stoichiometric ratio result in a very stable and predictable transient capability to ramp up from low power to rated power in < 2 sec and also to step down from rated power to low power levels instantaneously in a stable manner.
9

Keough, David A. "Citrus Processing Wastewater Treatment: Technology for the Next Millennium." In ASME 1999 Citrus Engineering Conference. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/cec1999-4506.

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The citrus processing industry has endured a variety of changes over the past 30 years. These changes included an expansion of the citrus crop through the 1980’s until the freezes. Then the industry endured through several rebuilding years until new groves planted farther south came into production. Plans for a record harvest this season were thwarted once again by Mother Nature. Paper published with permission.
10

Warren, Ted, Larry Morris, and John McPhearson. "Rapid H2 Purge With CO2 for Safer Plant Operations: Test Run Results." In ASME 2016 Power Conference collocated with the ASME 2016 10th International Conference on Energy Sustainability and the ASME 2016 14th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/power2016-59257.

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Hydrogen cooled generators need to undergo carbon dioxide (CO2) purging before being placed into service and when taken offline. This process typically takes 4 to 12 hours, and can take as long as 36 hours in extreme cases, to fully and safely purge a generator. Reducing the volume of hydrogen gas in these generators is essential for reducing the risks of explosions. If these purge times could be shortened, improvements in safety, shorter outages, and increased production could be realized. This paper describes plant testing of a CO2 Fast Degas purging system for hydrogen cooled generators. Results from eight test runs at two different plants are presented in tabular and graphical form. Mean reduction from pure hydrogen to less than 4% hydrogen was 39.8 minutes, while maintaining CO2 temperatures above 80°F (27°C). This eliminates the possibility of CO2 freeze up, and reduces the stress on the piping and the detrimental effects on the generator from extreme temperature swings that occur when CO2 is de-pressurized. These rapid purge rates were accomplished while maintaining the generator pressure within a set range. In order to achieve the minimum purge time, it is critical that mixing of the two gases be minimized during the purge operation. By utilizing the slope of the graphs provided, the system was optimized to minimize purge times to reach safe levels. Tests were performed on both purging operations, replacing hydrogen with CO2 and replacing air with CO2. Samples to analyze the generator gas purity were taken from the vent line using multiple thermal conductivity purity instruments to assure accurate results. The system was tested in both automatic and semi-automatic modes of operation. The fast degas system was found to significantly reduce generator purge times, reducing down time, and improve operator efficiency, positively affecting the overall safety profile of the plant.

Звіти організацій з теми "Freezer plant":

1

HEARD, F. J. Thermal Analysis for T Plant Process Cell Freeze Potential & Over Filled Large Diameter Containers. Office of Scientific and Technical Information (OSTI), July 2002. http://dx.doi.org/10.2172/807989.

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2

Task 21 - Evaluation of Artificial Freeze Crystallization and Natural Freeze-Thaw Processes for the Treatment of Contaminated Groundwater at the Strachan Gas Plant in Alberta, Canada - Sour Gas Remediation Technology R{ampersand}D. Office of Scientific and Technical Information (OSTI), March 1997. http://dx.doi.org/10.2172/637784.

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