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Search Results: 1 - 10 of 1385 matches for " Oswaldo "
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Seca da semente de café ao sol
Bacchi, Oswaldo;
Bragantia , 1955, DOI: 10.1590/S0006-87051955000100022
Abstract: in this paper the author deals with the question related to the coffee seed drying, with special attention to the effect of the sun radiations on seed viability. based on the results obtained, the following conclusions were drawn : (a) the sun rays have no specific influence on the viability of hulled coffee seed ; their effect is indirect and related to loss of moisture by the seed. (b) coffee seed can be dried in the sunlight without loss of viability if the water content does not drop under 8% to 9%. below this critical level seed germination falls rapidly. (c) the moisture content of coffee seed dried ?in the sun may fall to about 7% in a short time with the consequent injury to viability. (d) under most conditions in the state of s?o paulo, dehydration of coffee seed carried out in the shade is never injurious to viability because the final water content in such seed always remain well above the critical minimum.
O branqueamento dos gr?os de café
Bacchi, Oswaldo;
Bragantia , 1962, DOI: 10.1590/S0006-87051962000100028
Abstract: same time after being milled and stored, green coffee becomes normally subject to a phenomenon of discoloration or whitishness of the grains, which causes a considerable loss of its commercial value. in the present paper, which is the first to be published on this question, are reported the results of various experiments carried out in order to investigate the cause of this phenomenon and the influence of some factors on its manifestation. according to these results it may be clearly concluded that the injuries to the grains, such as those which normally result from their mechanical milling, are the indirect cause of the coffee discoloration. among the studied extrinsic factors, the relative humidity of air showed to be the most effective of them. the higher the air humidiry, especially on levels above 80%, the more rapid and intense was the manifestation of the phenomenon.
Estudos s?bre a conserva??o de sementes. II - Citros
Bacchi, Oswaldo;
Bragantia , 1958, DOI: 10.1590/S0006-87051958000100011
Abstract: seeds of rangpur lime and sweet orange, the two species most used as rootstocks in the state of s?o paulo, brazil, were stored under different conditions in order to find out the best for the conservation of their viability. it was found that seeds of both species remained viable longest when stored at 2-3°c in closed (not sealed) containers with very humid air. under these conditions, rangpur lime and sweet orange seeds could be kept successfully for 14 and 11 months, respectively. the importance of moisture content and temperature effects on the viability of these seeds is shown. it is likely, however, that other factors may be involved, such as growth of fungi and bacteria, rate and temperature of drying, and gaseous exchange as has been suggested by other workers.
Estudos s?bre a conserva??o de sementes. IV - Café
Bacchi, Oswaldo;
Bragantia , 1958, DOI: 10.1590/S0006-87051958000100020
Abstract: freshly harvested seeds of coffee (coffea arabica l. var. typica cramer) were air dried and sun-dried at different levels of moisture content and stored in open and sealed containers at room temperature. moisture determination and germination tests were made on the "fresh" seeds and at different intervals during the storage period. based on the results obtained, the following conclusions were drawn: 1) the process of drying did not interfere with the seed viability. 2) the longevity of the seeds kept in sealed containers was inversely proportional to the seed moisture content. seeds containing about 20%, 13%, and 10% of water continued viable for 4, 8, and 21 months, respectively. 3) independent of the initial moisture content, the seeds placed in open containers had approximately the same longevity of about 8 to 10 months. this was probably due to the very rapid dehydration of the moist seeds because of their small quantity. these results do not agree with those found by several authors, who are unanimous to affirm that coffee seeds are injured by slight or moderate drying in the air.
Equilíbrio higroscópico das sementes de café, fumo e várias hortali?as
Bacchi, Oswaldo;
Bragantia , 1959, DOI: 10.1590/S0006-87051959000100015
Abstract: this paper deals with the determination, of the hygroscopic equilibrium of coffee, tobacco, and vegetable seeds corresponding to relative humidities of their environment varying from 10% to 90%. judging by the relatively low dry weights of all the samples held at 90% relative humidity, there seems to be no doubt that the high moisture content obtained for these samples were partly due to a decrease in seed dry matter. the rate of change in moisture with change in humidity differed greatly among the various kinds of seeds. coffee and garden beans gained 0.18% in moisture with increase of 1% in humidity, while lettuce and tobacco gained half that amount.
Estudos s?bre a conserva??o de sementes. IX- Ingá
Bacchi, Oswaldo;
Bragantia , 1961, DOI: 10.1590/S0006-87051961000100035
Abstract: like other seeds of various economic crops, those of inga edulis lose their vitality in a few days when exposed to the air. storage of these short-lived seeds under different conditions of moisture content, temperature, and carbon dioxide accumulation has given the following information: 1. seeds lose their viability when the water content is reduced to 35% or less. 2. temperature seems not to be effective unless on the rale to which this critical point dessication is attained. 3. the rapid loss of vitality of seeds kept in airtight containers is probably due to the carbon dioxide accumulation. here also the temperature seems to act indirectly, modifyng the rate of respiration of the seeds.
Estudos s?bre a conserva??o de sementes. III - Trigo
Bacchi, Oswaldo;
Bragantia , 1958, DOI: 10.1590/S0006-87051958000100015
Abstract: freshly harvested seeds of garnet-63 wheat (triticum aestivum l.) were adjusted to four different moisture contents and stored in sealed containers at room temperature. germination better than 92% was obtained after seeds containing 7.8, 9.2 and 11.1 % of moisture content were stored during 30 months. complete viability for 12 months was obtained for seeds with the natural 13.1% of moisture content; marked decrease in the percentage of germination was observed when those seeds were stored longer. for stored seeds with 15.2% of moisture content, the germination was reduced to 64% after 2 months, and to 0% 6 months later. seeds with the natural 13.1% of moisture content, and stored in open container at room temperature, after 6 and 8 months germinated 80 and 62% respectively. under these storage conditions the moisture content of the seeds varied betwen 10.5 and 15.9% during the 12-month period of the experiment.
Novos ensaios s?bre a seca das sementes de café ao sol
Bacchi, Oswaldo;
Bragantia , 1956, DOI: 10.1590/S0006-87051956000100008
Abstract: including iioveral experiments on coffee seed drying carried out in the shade, in the sun, and by chemical dehydration, the present work was undertaken in order to clear up doubtful points in the literature, especially those related to trie viability of applying the sun drying process to this kind of seed. considering the complete confirmation of the results prior obtained by the a., it may be stated that the coffee seed can be dried in the sunlight without loss of vitality if the water content does not drop under 8% to 9%. below tins critical level seed germination falls rapidly even when dehydrated by chemicals at room temperature.
Observa??es citológicas em Coffea: VII - A macrosporogênese na variedade "monosperma"
Bacchi, Oswaldo;
Bragantia , 1941, DOI: 10.1590/S0006-87051941000600003
Abstract: this article deals with the observations made in the ovule and development of the macrogametophyte in coffea arabica l. var. monosperma. the young ovule is normally constituted by a rudimentary nucellus surrounded by a single and well developed integument. no irregularities are found until the beginning of the first meiotic division in the ma-crosporocyte which is situated inside the nucellus. the two meiotic divisions are very abnormal and during this process, 44,4 % of the otherwise normal macrospores degenerate. only. a few normal macrospores are formed. the functional macrospore is not always the chalazal one as in the normal coffee varieties. irregularities occur also in the subseguent divisions in the formation of the embryo sac. degeneration then increased from 44,4 to 82,0%. only one complete embryo sac has been found among the 87 examined ovules. during the formation of the embryo sac, even when complete degeneration occurs, the ovule increases in volume due to the multiplication of the integument cells. from the moment in which the embryo sac should be formed (two days after the flower opening) this increase in volume stops. a total desorganization of the ovule occurs around 105 days after the opening of the flower.
Sociabilidades e valores: um olhar sobre a família árabe mu?ulmana em S?o Paulo
Truzzi, Oswaldo;
Dados , 2008, DOI: 10.1590/S0011-52582008000100002
Abstract: this study explores the sociability and family values of muslim arabs in s?o paulo, brazil, based primarily on 10 interviews with individuals of different age groups, socioeconomic strata, and genders. with christian arab families as the counterpoint, the article contextualizes the arrival of these immigrants and discusses and investigates the family dilemmas and practices permeated by a strong patriarchal trait and the challenges faced by this religious minority. the article concludes that the group?s ethnicity and religiosity tend to be continuously reshaped as the group grows and reproduces in local society, reacts to the stereotypes attributed to it, and interacts more intensely with this same society through the new generations born in s?o paulo.
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