description and characteristicsof the main food crops
murphy - people, plants and genes - the story of crops and humanity (oxford, 2007)
Ngày tải lên :
03/04/2014, 12:11
... certain crops However, and most importantly, the !Kung are also cognisant of the unfavourable logistics and the greater risks of relying solely on farming for their food supply.15 These PEOPLE AND ... what they looked like, where they grew, when they set seed, what else ate them or competed with them, and so on They would have needed the right technologies for harvesting and processing of the ... distribution of six of the earliest cereal and legume crops to be domesticated in the Near East The maps show the distribution of the original wild ancestors of these six crops in the early Neolithic,...
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Báo cáo nghiên cứu nông nghiệp " Increasing the capacity of the Food Crops Research Institute to enhance the Production and Management of Potatoes in the Red River Delta " pot
Ngày tải lên :
22/06/2014, 13:20
... understanding of the dynamics of both domestic and export markets and the various means farmers have of collectively manipulating the supply of potatoes (and prices) to the market The hands-on ... ability to produce and store the product and control the volumes of tubers despatched to the market Most (approx.10,000 tonnes) of the seed used in the Red River Delta comes from China, the seed being ... seed tubers to the i) The increased yield of crops planted in the first field generation RRD will be demonstrated This will involve the importation of high quality seed in the RRD and the final bulking...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 1 pptx
Ngày tải lên :
15/12/2013, 00:15
... generally meet all these requirements and usually result in poor growth and survival in small fish larvae such as the Gilthead seabream On the otherhand live food organisms seem to meet all the necessary ... years through the development and use of a succession of live food organisms as feed for the developing larvae The aim of the present manual was therefore to review and summarise the latest developments ... 4.3 and 4.4) Figure 1.5 Selection criteria for larval food sources from the viewpoint of the culturist and the cultured larva (modified from Léger et al., 1987) From the practical viewpoint of the...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 2 doc
Ngày tải lên :
15/12/2013, 00:15
... between the culture medium and the air The latter is of primary importance as the air contains the carbon source for photosynthesis in the form of carbon dioxide For very dense cultures, the CO2 ... micro-algae The most common sources of contamination include the culture medium (sea water and nutrients), the air (from the air supply as well as the environment), the culture vessel, and the starter ... In either case, the juveniles, representing the largest biomass in the hatchery and demanding the highest weight-specific rations, consume the largest volumes of algal culture (Fig 2.16.) The...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 3 ppt
Ngày tải lên :
15/12/2013, 00:15
... area The growth of the animal is assured by plasma increase and not by cell division The epidermis contains a densely packed layer of keratin-like proteins and is called the lorica The shape of the ... the lorica The shape of the lorica and the profile of the spines and ornaments allow the determination of the different species and morphotypes (see 3.4.) The rotifers body is differentiated ... consisting of the head, trunk and foot (Fig 3.1.) The head carries the rotatory organ or corona which is easily recognized by its annular ciliation and which is at the origin of the name of the Rotatoria...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 4 pptx
Ngày tải lên :
15/12/2013, 00:15
... “breaking”) and the embryo appears, surrounded by the hatching membrane (Fig 4.1.2.) While the embryo hangs underneath the empty shell (= “umbrella” stage) the development of the nauplius is completed and ... nauplius eye in the head region and three pairs of appendages: i.e the first antennae (sensorial function), the second antennae (locomotory + filter-feeding function) and the mandibles (food uptake ... dispersion, wind and waterfowl (especially flamingos) are the most important natural dispersion vectors; the floating cysts adhere to feet and feathers of birds, and when ingested they remain intact...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 5 docx
Ngày tải lên :
15/12/2013, 00:15
... by the hatching membrane becomes visible The embryo then leaves the shell completely and hangs underneath the empty shell (the hatching membrane may still be attached to the shell) Through the ... can follow the differentiation of the pre-nauplius into the instar I nauplius which starts to move its appendages Shortly thereafter the hatching membrane breaks open (= hatching) and the free-swimming ... results in the breaking of the cyst envelope, at which moment all the glycerol produced is released in the hatching medium In other words the metabolism in Artemia cysts prior to the breaking...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 6 docx
Ngày tải lên :
15/12/2013, 00:15
... 1986) On the other hand, instar II stages may be more susceptible to digestive enzyme breakdown in the gut of the predator since these enzymes can also penetrate the digestive tract of the Artemia ... prior to the Artemia and undergo a several-day weaning period when both foods are given Thus, the addition of Artemia too early in the life cycle may result in the competition for the algal food ... understood and may be satisfied through the consumption of seawater, the main concern regarding the mineral composition of Artemia is whether they meet the requirements of fish or crustacean larvae...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 7 pptx
Ngày tải lên :
15/12/2013, 00:15
... big ones Too small air bubbles, on the other hand, may get trapped between the thoracopods and skim off the animals to the surface WATER QUALITY The quality of the culture medium is first affected ... influence the feeding behavior of Artemia by affecting the filtration rate, ingestion rate and/ or assimilation: including the quality and quantity of the food offered, the developmental stage of the ... of dry food is the consistency of the food quality and supply, and the possibility for storage without loss of quality It follows therefore that bulk products must be stored in a dry and preferentially...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 8 pptx
Ngày tải lên :
15/12/2013, 00:15
... disk (Fig 4.5.10) The disk is lowered in the water up to the point where the contrast between the white and black (or red) fields disappears, and the depth recorded After lowering the disk a little ... enters via this way the food cycle The other source of nitrogen is organic material in the intake water Algae use nitrate (NO3-) and ammonium (NH4+) As the nitrogen influx in the system depends ... more than one month The algae and organic matter created in the low salinity ponds are drained to the high salinity ponds and are there available as food * Conditions in the fertilizer ponds...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 9 pptx
Ngày tải lên :
15/12/2013, 00:15
... filtration and prevent losses due to the narrow and strong back current The longer the distance between the propeller and the net, the wider and shorter the net can be The distance between the propeller ... effective and rapid the filtration Hence, the upper limit of the dimensions of the nets depends on the ease of handling rather than anything else The effectiveness of filtering is also influenced by the ... mesh size of the net: the denser the net the faster it will clog, hence, the smaller its effectiveness It is therefore necessary to estimate with great accuracy the required size of the food particles...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 10 pptx
Ngày tải lên :
15/12/2013, 00:15
... 300 and depends largely upon the size of the female and the food intake) are laid in the brood chamber shortly after ecdysis and hatch just before the next ecdysis Embryonic ... in the broodpouch and the larvae are miniature versions of the adults In some cases the embryonic period does not correspond with the brood period, and this means that the larvae are held in the ... The unfed particles, exuviae and faeces will collect in the centre on the bottom of the sieve, while the daphnids remain in the water column The unwanted material can then be removed by using a...
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Tài liệu TREES OF THE NORTHERN UNITED STATES THEIR STUDY, DESCRIPTION AND DETERMINATION FOR THE USE OF SCHOOLS AND PRIVATE STUDENTS doc
Ngày tải lên :
13/02/2014, 12:20
... The last of the four kinds of parts is found in the center of the flower, and is called the pistil It is this part which forms the fruit and incloses the seed The stamens and the pistil are the ... acquainted with all the useful and ornamental woods used in a region; the differences in the color of the heart-wood, the character of the annual layers, and the size and the distribution of the medullary ... other; the bark of the Chestnut opens in large longitudinal cracks quite distant from one another The color of the bark and the character of the scales are quite different in the White and the...
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Tài liệu Báo cáo khoa học: "An Implemented Description of Japanese: The Lexeed Dictionary and the Hinoki Treebank" ppt
Ngày tải lên :
20/02/2014, 12:20
... language understanding Treebanking the output of the parser allows us to immediately identify problems in the grammar, and improving the grammar directly improves the quality of the treebank in ... “person” and for doraib a3 the hypernym is クラ ¯ ブ kurabu “club” (see Figure 1) We also extract other relationships, such as synonym and domain Because the words are sense tags, we can specialize the ... over the parse derivation trees, with the current node, two grandparents and several other conditioning features A preliminary experiment showed the correct parse is ranked first 69% of the time...
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The Fast Food Diet Lose Weight and Feel Great Even If You’re Too Busy to Eat Right ppt
Ngày tải lên :
06/03/2014, 05:20
... that people who eat the most fast food have the least understanding of how these foods affect their weight and their health Nor they have the time or interest to explore the damage that excessive, ... Fast -Food Diet at the Mall 95 The Six-Week Fast -Food Diet 105 Fast Food at Home 125 The Fast -Food Diet for Kids 151 10 The Fast -Food Diet Vitamins and Supplements 157 11 The Fast -Food Diet for Business ... much food we pack into our stomachs that causes the problem, but rather the kind of food Calories, not the volume, are the real culprit This is an important distinction, and understanding it is the...
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Minimum Wages and Employment: A Case Study of the Fast-Food Industry in New Jersey and Pennsylvania pot
Ngày tải lên :
08/03/2014, 06:20
... three of the chains and another dummy for company-owned stores As shown by the probability values in row 6, these covariates add little to the model and have no effect on the size of the estimated ... GAP, and NJ, to the employment model The estimated coefficient of the New Jersey dummy then provides a test of the Pennsylvania control group When we estimate these models, the coefficient of the ... Central, and South) and two regions of eastern Pennsylvania (Allentown-Easton and the northern suburbs of Philadelphia) These dummies control for any regions~ecific demand shocks and identifv the...
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THE RAW FOOD DETOX DIET THE FIVE-STEP PLAN TO VIBRANT HEALTH AND MAXIMUM WEIGHT LOSS docx
Ngày tải lên :
15/03/2014, 04:20
... raw vegan foods Unlike many raw food books, The Raw Food Detox Diet allows and even emphasizes the inclusion of some cooked food in the diet (recommending different percentages of cooked food for ... loss, but then they make the broader connection between this way of eating and feeling better than they ever have before The Raw Food Detox Diet is, quite frankly, the most healthful diet on the planet ... you call up the local waste management system and ask them to come by in the morning to haul it away They arrive on time and remove a lot of it, but they get tired and tell you that they can’t...
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The Nutritionist Food, Nutrition, and Optimal Health Second Edition pptx
Ngày tải lên :
15/03/2014, 04:20
... fundamental principles of chemistry and biology and a description of their relevance to nutrition and the body It’s Atoms and Molecules That Make the Man, Not Clothes What Is the Most Basic Composition ... for the head to fit through the mother’s birth canal What Is the Spinal Cord? The spinal cord extends from the brain and serves mostly as a relay station connecting the brain to the rest of the ... calcium bathes myofibrils and contraction is invoked Usually there is enough ATP in these dying cells to power the contraction The dying cell then remains locked in a contracted state The Heart and...
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