Xem 1-20 trên 84 kết quả Plant experiments
  • Potassium (K + ) is the most abundant inorganic cation in plant cells. Unlike animals, plants lack sodium⁄potassium exchangers. Instead, plant cells have developed unique transport systems for K + accumulation and release.

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  • When the price of Ginseng advanced some years ago hundreds engaged in the business who knew little or nothing of farming, plant raising and horticulture. That they largely failed is not to be wondered at. Later many began in a small way and succeeded. Many of these were farmers and gardeners. Others were men who had hunted, trapped and gathered "seng" from boyhood. They therefore knew something of the peculiarities of Ginseng. It is from the experience of these men that this work is largely made up--writings of those who are in the business.

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  • Plants are sessile organisms and as such must have mechanisms to deal with both abiotic and biotic stresses to ensure survival. The term “abiotic stress” includes many stresses caused by environmental conditions such as drought, salinity, UV and extreme temperatures. Due to global climate change it is predicted that abiotic stresses will increase in the near future and have substantial impacts on crop yields (Intergovernmental Panel of Climate Change; http://www.ipcc.ch).

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  • THE EXTENT AND TIMING OF PLANT GROWTH are controlled by the coordinated actions of positive and negative regulators. Some of the most obvious examples of regulated nongrowth are seed and bud dormancy, adaptive features that delay growth until environmental conditions are favorable. For many years, plant physiologists suspected that the phenomena of seed and bud dormancy were caused by inhibitory compounds, and they attempted to extract and isolate such compounds from a variety of plant tissues, especially dormant buds.

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  • All living organisms require food for survival, growth, and reproduction. Most broadly, the term food can be taken to include any kind of nutrient needed by animals, plants, and simpler forms of life, on down to bacteria. This would include, for example, the inorganic substances that 5 plants draw from air and water. The processes that circulate these basic nutrients in the environment are called nutrient cycles, and the processes by which organisms make use of nutrients are collectively known as metabolism.

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  • In Handbook of Water and Wastewater Treatment Plant Operations , the intent of the author is twofold. The Þrst intent is to consolidate the information and experience in waterworks and wastewater treatment plant operations that have evolved as a result of technological advances in the Þeld, and as a result of the concepts and policies promulgated by the environmental laws and the subsequent guidelines.

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  • In November of 2000, The Wall Street Journal asked me to write an opinion piece on Jack Welch’s choice of a successor. The essay, entitled Welch’s Successor is likely to Succeed, included the following proclamation: “Welch has done more to advance the body of knowledge than any of his contemporaries. He created a new business lexicon.” This statement planted the seed for this book...that the very words, terms, and phrases used most often by Jack Welch, 250 in all, could become the basis for a management book....

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  • Generally, a process is defi ned as a sequence of events that transforms the biological materials of food products, via biochemical changes, into stable forms with added value. This can create new products or modify existing ones. Process design refers to the design of food processes and manufacturing methods, while plant design refers to the design of the whole processing plant. The processing of food is no longer as simple or straightforward as in the past. Food process design is an interdisciplinary science that is highly regarded by the food industry.

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  • The employment interview is the most universally used method of selecting employees into a company. At P&G, its primary purpose is to obtain information from candidates to determine whether they are suitable for employment. A secondary purpose is to provide candidates with information about the job and Company so that they can make informed decisions about pursuing employment opportunities at P&G.

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  • Nuclear power approximately supplies a sixth of the world's electricity and considers as the major source of "carbon-free" energy today. With growing concerns aboutglobal warming, it is not surprising that governments and power providers around the world are considering building a substantial number of additional nuclear power plants. These plants have demonstrated remarkable reliability and efficiency with the help of extensive research work and sharing operational practical experience.

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  • Contraceptive use accounts for a substantial portion of the variation in observed fertility rates (others include age of marriage, abortion rates, post- partum amenorrhea and abstinence, and occurrence of marital separations). Although there have been dramatic increases in the use of family planning services, unmet need for family planning remains very high in low-prevalence regions.

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  • 11 Iron Julius von Sachs, the founder of modern water culture experiments, included iron in his first nutrient cultures in 1860, and Eusèbe Gris, in 1844, showed that iron was essential for curing chlorosis in vines.

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  • 19 Silicon Silicon (Si) is the second-most abundant element of the Earth’s surface. Beginning in 1840, numerous laboratory, greenhouse, and field experiments have shown benefits of application of silicon fertilizer for rice (Oryza sativa L.), corn (Zea mays L.), wheat (Triticum aestivum L.).

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  • Textile industry is a leading industry for most countries, such as China, Singapore, UK, Bangladesh, Italy, Turkey etc. But, environmental pollution is one of the main results of this industry. Parralel to usage of huge amounts of water ad chemicals, the textile dyeing and finishing industry is one of the major polluters among industrial sectors, in the scope of volume and the chemical composition of the discharged effluent (Pagga & Brown, 1986).

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  • The last twenty years of the last millennium are characterized by complex automatization of industrial plants. Complex automatization of industrial plants means a switch to factories, automatons, robots and self adaptive optimization systems. The mentioned processes can be intensified by introducing mathematical methods into all physical and chemical processes

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  • This book is intended for both mechanical and electronics engineers (researchers and graduate students) who wish to get some training in smart electronics devices embedded in mechanical systems. The book is partly a textbook and partly a monograph. It is a textbook as it provides a focused interdisciplinary experience for undergraduates that encompass important elements from traditional courses as well as contemporary developments in Mechtronics.

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  • The serious challenge facing the world today, in obtaining enough energy for growing population and in controlling the carbon emission caused by fossil fuel use, calls for nuclear energy as an alternative power source. This book presents research work and technical experience from several power plants and research institutions around the world from practical prospective.

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  • Next, we examine predictability in both benchmark returns and fund risk loadings. Consider the dogmatist who believes in such a predictability structure (PD-2). This investor would experience a nontrivial utility loss of 15.1 basis points per month (1.8%/ year) in December 2002 if forced to hold the optimal portfolio of the ND. The utility loss is even larger over the course of all 276 monthly investments. This loss averages 21.1 (39) basis points per month over expansions (recessions).

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  • Adolescents, currently about 20 percent of the world’s population, have special reproductive health concerns and face risks related to early sexual experience, marriage and fertility. A rise in the age of marriage globally has contributed to declines in adolescent fertility. However, up to 50 percent of women in some countries still marry or enter a union by age 18, with this figure rising to 70 per- cent by age 20. The proportion of young women married or in union by age 20 is closely linked to adolescent fertility and exposure to reproductive health risks....

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  • Academics and students are committed to making a significant contribution to international knowledge and enhancing Dublin’s role as Ireland’s global gate-way. Civic engagement and interaction with industry are emphasised both in the curriculum and in the overall student experience. Collaboration with industry and professional bodies is embedded in many DIT programmes and is integral to how DIT continues to adapt to the ever-quickening pace of change globally.

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