This website uses cookies to ensure you have the best experience. Learn more

Science / Seed Taming / Group Work

548 words - 3 pages

Recalcitrant seeds are not only desiccation-sensitive, but also metabolically active. In contrast, orthodox seeds, owing to their dry state, are metabolically quiescent. Lowering the water content to a level that would preclude germination but facilitate vital metabolism has been suggested as a way to extend the life-span of recalcitrant seeds in hydrated storage. However, Daniel Côme and Françoise Corbineau of the Université Pierre et Marie Curie in Paris, and we, have independently shown that this practice of partial dehydration curtails the seeds' storage life-span.Current work by graduate students Déon Erdey and Sharon Eggers in our laboratory suggests that slight dehydration stimulates the onset of germinative metabolism, thereby ...view middle of the document...

Seed-associated fungi are ubiquitous and pose a prodigious problem: They use seed tissues as their source of nutrition. As a result, the seeds rapidly weaken and die. With graduate student Claudia Calistru and others, we showed that if the seed's fungal load can be reduced or eliminated, then seed storage life-span can be doubled or even quadrupled, depending on the species. Although promising, even this advance is not enough for useful long-term storage of highly recalcitrant seeds.We also have been pursuing another strategy for halting germinative metabolism in order to increase storage times: deep-freezing. There has long been a consensus that achieving and maintaining the deep-frozen state by cryostorage--usually in liquid nitrogen at -196ºC--is the only solution for long-term storage of recalcitrant seeds.But how can this be achieved practically? Recalcitrant seeds--whether coconuts or the "pips" of a litchi, mango, or avocado pear--are generally large. These seeds also are "wet." Such large, hydrated living structures will not be able to withstand the effects of freezing; the ice crystals wreak lethal havoc on cell structures. The challenge for storing recalcitrant seeds, therefore, depends on both the hydration state and on seed size. The answer lies in reducing both.We had already begun to make progress in overcoming the obstacles posed by hydration. We previously had observed that the faster the seeds could be dried, the greater the degree of water loss that recalcitrant seeds would tolerate. But large recalcitrant seeds lose water only slowly even under conditions that hasten dehydration. Generally, therefore, the seed dies when its tissues are still too wet to be frozen.

Other Essays On Science :: Seed Taming :: Group Work

Testing Essay

5352 words - 22 pages December 14, 2012. This work is supported by the CCLI-TUES program of National Science Foundation under grant DUE-0837385 and a grant from the Sponsored Research Program at Middle Tennessee State University. Cen Li, Zhijiang Dong, and Roland H. Untch are with the Department of Computer Science, Middle Tennessee State University, Murfreesboro, TN 37132 USA (e-mail: Cen.Li@mtsu.edu, Zhijiang.Dong@mtsu.edu, Roland.Untch@mtsu.edu). Michael Chasteen

Motivating Others Essay

767 words - 4 pages Running head: MOTIVATING OTHERS PAGE \* MERGEFORMAT 1 MOTIVATING OTHERS PAGE \* MERGEFORMAT 5 Motivating OthersMotivating OthersThe success of any business can always be traced back to motivated employees. From profitability and productivity to innovation and hard work it always leads to employees. An important factor that drives an employee to want his or her job is motivation. Unfortunately, motivating people is not an exact science. Some

Industrial Revolution

1744 words - 7 pages . The America's then introduced potatoes to Great Britain. New farm machines were invented, for example Jethro Tull developed a seed drill which planted seeds in straight rows and farmers began using new iron plows in place of inofitiant wooden plows. In addition to that, the enclosure movement brought wealthy people to farm larger amounts of land, which was very good for the agricultural revolution. This revolution improved peoples diet and

Decolonization Of The British Empire

1975 words - 8 pages , and too near us to be dependent on a foreign state, and too little to be independent." By 1916, Europe was engaged in a war that no one could have predicted the scale of, and the National Services Act which was threatening conscription was soon to be in place. In the same year, the first step towards Irish independence was with the Easter Rising. On April 24, a group of Irish nationalists called the Irish Republican Brotherhood staged a rebellion

What Enzymnes Are?

2561 words - 11 pages groups, that enzymes categorize into and the categorizations into groups are depended on the type of reaction the enzyme catalyses.The first group is the 'oxidoreductases' group. The type of reaction catalysed in this group is the removal or addition of hydrogen atoms, oxygen, or electrons from one molecule to another (oxidation or reduction-or in other words redox reaction.):alcohol dehydrogenaseEthanal + NADH + H+ → ethanol+ NAD+In this

Einstein

1837 words - 8 pages Of all the scientists to emerge from the nineteenth and twentieth centuries there is one whose name is known byalmost all living people. While most of these do not understand this man's work, everyone knows that its impacton the world of science is astonishing. Yes, many have heard of Albert Einstein's General Theory of relativity,but few know about the intriguing life that led this scientist to discover what some have called, 'The

Experimenting With The Globe

7036 words - 29 pages building, so far as the current information allows. What we cannot do so readily is to re-create all the original materials, not just the original staging but the early audiences for whom Shakespeare wrote, and all the languages that he and they shared and we have lost. Besides the machine itself we need to retrieve the meaning of lines like "Then vail your stomachs, for it is no boot" which Kate delivers near the end of The Taming of the Shrew,[3] and

A Report Reflection Of Magazine Distribution Order Picking Report

3428 words - 14 pages : Finding differences between suggested solution and adopted solution 71. 1 Suggested strategy by group 91. 2 Adopted solution by menzies adopted at the time 11PART II: Evaluating Vertical Carousels and Gravity Flow Racking system 13Table of Reference: Table of Figures5Figure 1 External factors chart (e.g. daily throughput) of menzies distribution (1980 VS 2008) 6Figure 2: Structure of the Individual Reflection 8Figure 3 Outlining the 'Group

Impact Of Mass Media In Bangladesh

4181 words - 17 pages Term paper:Title: Impact of Mass media in Bangladesh.Submitted to:Lutfun Nahar LataFaculty, Department of Economics and social science (ESS)BRAC UNIVERSITYSubmitted by:Anita Islam Saiba ID- 14104161Nikita Azmi Hasan ID- 13103007Nusrat Sharif ID- 14104021Index Chapter Page no. 1. Introduction 5 2. Methodology 2.1 Focus Group 6 2.2 Group Size 6 2.3 Data Collection 6 2.4 Data Analysis 2.5 Limitation 7 3

The Aristocracy & Government

1406 words - 6 pages ? What would stop Jefferson from behaving improperly? Russell Kirk said, "There ought to be inequality of condition in the world. For without inequality, there is no class; no manners and no beauty; and then people sink into public and private ugliness." With no separation of class in society, there could be no advancement of science, technology, and the arts. With everyone equal, everyone would have to do the same work to keep themselves alive. The

Robert Frost

3042 words - 13 pages , when it comes to the basic themes of human life there is shirking on his part, though he evades the universal experiences at the price of triviality. A point worthy to be stressed here is that the work of his contemporary writers who are characterized by topical labels became lusterless and outdated as the year passed. Meanwhile Frost's poems retain their freshness, as they are less reliant on contemporary idioms, events and people. Frost knows

Similar Papers

Where's The Happy State: A Comparative Literature Analyzing Freud And Rousseau

1936 words - 8 pages on us and conclude that civilization actually does more harm to society than benefits it, although they disagree on how this occurs. Even though both Freud and Nietzsche believe that civilization is based on the taming of human instinctual life with some form of morality, Freud believes that civilization represses one's own instinct of aggressiveness and attempts to prevent suffering from one's self-guilt, even though it inflicts more self-guilt

Human Cloning Should Not Be Banned

3678 words - 15 pages Untitled Human Cloning Should Not Be Banned�by�Jason Brown Cloning humans has recently become a possibility that seems much more feasible in today's society than it was twenty years ago. The process used in cloning has been practiced on livestock for quite a few years with good results. The techniques have been proven to work, and with the rapid growth of technology in this field, human cloning can one day be very beneficial to

Howard Nemerov Essay

1907 words - 8 pages them together. Denis Donoghue states, '. . . this inner division, under constant pressure of Nemerov's poetic discipline and intelligence, accounts for the power of this writer who has become, more than any other contemporary poet, the spokesman for the existential science- oriented . . . , liberal mind of the twentieth century' (250). This deeply divided personality is evident to readers of his poetry and fiction.In his first published work

"The Genius That Was China" This Essay Is About The Wonderful Technological Developments Of Ancient China And How They Influenced The Development Of The West

1773 words - 8 pages still in the present, although machines do most of the work now. To complement row planting, a device was developed called the seed drill. With this a farmer didn't need to plant seeds by hand, resulting in quicker work and greater acreage. The seed drill would emigrate to Europe as well. While plows were used in all parts of the world the ones in China were much superior. Made of iron the plow had a sturdy, square frame, strong heavy, well