Xem 1-20 trên 52 kết quả Plant leaves
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Do mitochondria play a role in remodelling lace plant leaves during programmed cell death?

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  • Abstract: The impact of salinity on three arboreal mangrove plants, Sonneratia apetala (Sa), S. caseolaris (Sc) and Rhizophora stylosa (Rs), was studied. The three mangrove species were treated with different salinity levels over a three-month period. The response and adaptation of these three mangrove species to salinity were shown to be different. Net photosynthesis rate, stomata conductance and transpiration rate of leaves decreased and soluble sugar content in leaves increased, with salt concentration in all three mangrove species.

    pdf6p nguyenngocsonctu 24-11-2010 63 12   Download

  • SURVIVAL ON LAND POSES SOME SERIOUS CHALLENGES to terrestrial plants, foremost of which is the need to acquire and retain water. In response to these environmental pressures, plants evolved roots and leaves. Roots anchor the plant and absorb water and nutrients; leaves absorb light and exchange gases. As plants increased in size, the roots and leaves became increasingly separated from each other in space. Thus, systems evolved for long-distance transport that allowed the shoot and the root to efficiently exchange products of absorption and assimilation.

    pdf30p anhphuonggl 11-04-2013 37 9   Download

  • As I think I told you, Roger’s reaction to the “Sacrifice Photos” was even stronger and more immediate than mine.

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  • LIFE IN EARTH’S ATMOSPHERE presents a formidable challenge to land plants. On the one hand, the atmosphere is the source of carbon dioxide, which is needed for photosynthesis. Plants therefore need ready access to the atmosphere. On the other hand, the atmosphere is relatively dry and can dehydrate the plant. To meet the contradictory demands of maximizing carbon dioxide uptake while limiting water loss, plants have evolved adaptations to control water loss from leaves, and to replace the water lost to the atmosphere.

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  • Spinous or prickly shrubs or trees. Leaves bipinnate with cordate stipules; leaflets small. Inflorescence globose heads; flowers white. Fruits ligulate or oblong pods, not jointed, think succulent. When dry shrivelled and rugose with wavy sutures.

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  • Tham khảo sách 'wind turbines_1', kỹ thuật - công nghệ, năng lượng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The area of wind energy is a rapidly evolving field and an intensive research and development has taken place in the last few years. Therefore, this book aims to provide an up-to-date comprehensive overview of the current status in the field to the research community. The research works presented in this book are divided into three main groups.

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  • The large amount of water required for the production of plant substance is taken from the soil by the roots. Leaves and stems do not absorb appreciable quantities of water. The scanty rainfall of dry-farm districts or the more abundant precipitation of humid regions must, therefore, be made to enter the soil in such a manner as to be readily available as soil-moisture to the roots at the right periods of plant growth. In humid countries, the rain that falls during the growing season is looked upon, and very properly, as the really effective factor in the production of large...

    pdf27p asus1122 24-10-2012 24 8   Download

  • Macadamia trees (often called the tree people Mac-ca) is one of the crops of high economic value. Macadamia is the common name for nine species of the genus Macadamia, open cross Affairs (Proteaceae) in which two species have commercial value as M. integrifolia Maiden & Betche and M.tetraphylla. L. Johnson. Both species were grown in the eastern coastal regions - South and South East Queensland - Northern New Wales of Australia.

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  • Cho phép nhập theo phiên âm Acacia tree species that grows fast, capable of improving land. The tree has thick foliage good defense capability. Wood is hard core, dark, fine grained, used as timber, timbering, flooring, plywood, pulp, firewood and charcoal. characteristics Tall trees, up to 30 environment. Strong capacity for regeneration. Acacia leaves large, there are four main tendons, leaves Acacia auriculiformis long, slightly curved, narrow and has two main tendons. Acacia hybrid between the two types of intermediate leaves Acacia auriculiformis and Acacia midrib with 3-4.

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  • All plants when carefully burned leave a portion of ash, ranging widely in quantity, averaging about 5 per cent, and often exceeding 10 per cent of the dry weight of the plant. This plant ash represents inorganic substances taken from the soil by the roots. In addition, the nitrogen of plants, averaging about 2 per cent and often amounting to 4 per cent, which, in burning, passes off in gaseous form, is also usually taken from the soil by the plant roots. A comparatively large quantity of the plant is, therefore, drawn directly from the soil. Among the ash...

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  • This translation was undertaken with the especial object of facilitating the study of the native medicinal plants by the numerous medical officers stationed at small posts throughout the Philippines. In order to aid in the recognition of these plants, the botanical descriptions have been revised to the extent of adding, where possible, the size and shape of the plant, English name, length of leaves, color of flowers, etc., in many instances supplying the entire botanical description where it had been omitted on account of general familiarity with the plant.

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  • In order to evaluate the status of damage caused by the stresses on the plants growing process before visible damage is noticed, we have followed the evolution of the Chl content in the plant leaves using the Fr/FFr chlorophyll fluorescence ratio. The absolute emission signal of leaves can vary from sample to sample due to small differences such as excitation and sensing angles of the fluorescence, and the roughness and scattering properties of the leaf surface. Thus, the absolute fluorescence usually varies to a large extent than the fluorescence ratio.

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  • 1.1.Cham after the first year. - 2 times to plant in spring and a time to plant collection. - Last one right after planting 1-2 months (5,6) - Stage 2 on May 11, 12. - Planting trees mile dead - To clean vines, shrubs, planting weeds in ditches. - Turn the soil around the hole with large diameter 40 - 50cm. - Protection of cattle not destroy the trees. Detection of fungal plant remove the diseased leaves, the trees were burned to avoid pulling heavy spread. - Prevention of forest fire by constructing fire towers runway.

    pdf40p xau_la 10-02-2012 18 4   Download

  • The 39th parallel of latitude lies just south of Tientsin; followed westward, it crosses the toe of Italy's boot, leads past Lisbon in Portugal, near Washington and St. Louis and to the north of Sacramento on the Pacific. We were leaving a country with a mean July temperature of 80 deg F., and of 21 deg in January, but where two feet of ice may form; a country where the eighteen year mean maximum temperature is 103.5 deg and the mean minimum 4.5 deg; where twice in this period the thermometer recorded 113 deg above zero, and twice 7...

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  • The idea that would become the foundation of this book—that indigenous people’s stewardship of the land carries important lessons for us in the mod- ern world—germinated in my mind as I stood in a Mexican farmer’s fields in summer 1983. Growing alongside the many kinds of crop plants were a variety of native herbs and trees. Insects buzzed and clicked, and birds chat- tered.The land smelled good and radiated beauty.The farmer was using the land quite intensively, yet much of the natural plant and animal diversity remained.

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  • Despite its importance in plant metabolism, no sequences of higher plant ATP-dependent phosphofructokinase (EC are annotated in the databases. We have purified the enzyme from spinach leaves 309-fold to electrophoretic homogeneity. The purified enzyme was a homotetramer of 52 kDa subunits with a specific activity of 600 mUÆmg )1 and aKmvalue for ATP of 81 lm.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Evaluation of protein pattern changes in roots and leaves of Zea mays plants in response to nitrate availability by two-dimensional gel electrophoresis analysis

    pdf17p panasonic06 25-12-2011 21 3   Download

  • They were, one and all, from the broadest and best to the narrowest and least frequented, very dark. The oil and cotton lamps, though regularly trimmed twice or thrice in the long winter nights, burnt feebly at the best; and at a late hour, when they were unassisted by the lamps and candles in the shops, cast but a narrow track of doubtful light upon the footway, leaving the projecting doors and house-fronts in the deepest gloom. Many of the courts and lanes were left in total darkness; those of the meaner sort, where one glimmering light twinkled for a...

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