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Live fish transport
Time of Update: 2021-01-08
Any factors that affect the change of dissolved oxygen content of water and the low oxygen tolerance of fish will affect the survival rate of live fish transportation.
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Micropropagation of Phalaenopsis Blume
Time of Update: 2021-01-08
For high frequency regeneration ofPhalaenopsis , young leaf segments are cultured on gelrite-gelled � MS medium supplemented with 2% sucrose, 2.0 mg/L BA, 0.5 mg/L NAA, 10% coconut water (CW), 2 g/L peptone and 1 g/L activated charcoal.
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The basic experimental operation series of photonsynical use is one: the influence of environmental factors on photomembering is observed by the leaf disc sembed method
Time of Update: 2021-01-08
In the process of photocodying, the leaf disc absorbs CO-2 and releases oxygen, because oxygen dissolves very little in water and accumulates between cells and on the leaf surface, resulting in the original sunk leaf disc floating, according to the length of time required to rise, that is, to measure the strength of photocodying.
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Male groups
Time of Update: 2021-01-08
Before the mature flower medicine cracks, the separation between the chambers may have ruptured, and the flower medicine of the four spore sacs becomes two pollen sacs.
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Seawater sampling collection
Time of Update: 2021-01-08
0:05 Sea water sampling and collection 5 0:10 Content Introduction 10 0:37 Collected water samples 37 3:07 Collected gas samples 187 4:04 Collect nutrient specimens (including nitrates, phosphates an
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Algae
Time of Update: 2021-01-08
According to the type of photochemical pigment contained, the type of photochemical products stored, algae form, cell wall structure and chemical composition, reproductive mode, life history type, whiplash, the availance, quantity, place of birth and so on, it is divided into several doors.
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Water potential
Time of Update: 2021-01-08
When in the initial mass wall separation, the cell is not tense (in relative volume of 1.0 ), at this time the pressure potential is equal to zero, the water potential of the cell is equal to the permeability of the cell fluid, both of which are minimal (about -20 bar).
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The development of wheat flowers and pollen grains
Time of Update: 2021-01-08
The flower medicine of small flowers in different parts of wheat spike 2 to 3 days before the fixed flowering can be observed from single-core pollen grain to mature pollen grain during the development period.
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Ladder grasses are plants
Time of Update: 2021-01-08
。 (Ecological habits) like cold and humid climate, strong resistance to low temperature, drought and high temperature, heat and drought resistance between high sheep and grass sheep, resistance to trampling is very poor.
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Soluble sugar content determination in plant tissue (phenol method)
Time of Update: 2021-01-08
3. Measure the absorption of 0.5 ml of sample fluid in the test tube (repeat 2 times), add 1.5 ml of distilled water, with the steps of making a standard curve, in order to add phenol, thick sulfuric acid solution, color and determine absorbance.
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The concept of the history of plant life
Time of Update: 2021-01-08
there are an estimated 40, species of plants on the earth, which can be divided into 7, species according to plant morphology, structure and living habits, i.e. algae (algea ), fungi (fungi) , litho
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Cell morphology observation and size measurement
Time of Update: 2021-01-08
experimental supplies appliances: microscopes, tweezers, slides, cover slides, eyepiece microscopes, mirror microscopes Materials: H.E dyeing color labels : mice liver cells, testicles Tissue Cells I.H Staining Specimens: Onion Root Tip Cells Fresh Materials: Onions, Purple Duck Toe Grass Experimental Method Steps (i) Cell Morphology Observation 1.
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Experiment 9 Effect of potassium ions on pore opening
Time of Update: 2021-01-08
2. Put 0.5% KNO 3 , 0.5% NaNO 3 and 15 ml of distilled water in 3 Petri dishes.
4. The petri dish is placed in a temperature tank at 25 degrees C, so that the solution temperature reaches 25 degrees C.
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Crops are interbreeding
Time of Update: 2021-01-08
Alcohol on the tweezers after disinfection should be used only after evaporation is clean, so as not to damage the column head when going male.
After going to male 1 to 2 days, the column head secretes mucus, at this time the most suitable to accept pollen.
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Cladophora
Time of Update: 2021-01-08
Cell walls are extremely thick, often hierarchical, the surface of the layer contains 70 % of the protein , often rough, so that there are often many algae attached to it; Pieces of the silky body, the false roots of the base cells can be nutritional reproduction.
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Expression Library Screening
Time of Update: 2021-01-08
When trying to identify a clone within a c DNA library, which may contain a coat protein (CP) gene, one useful technique may by immunological screening, using antibodies raised against either purified virus or isolated CP.
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The development of lily medicine and pollen grains
Time of Update: 2021-01-08
。 (2) Lily drug production in different developmental periods observation Lily in different developmental periods of the permanent production of flower medicine may generally include spore-forming tissue period, pollen mother cell deseed division pre-I before and after, two and four parts, single-core pollen particles and mature pollen particles and other periods.
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Extraction of chlorophyte pigment
Time of Update: 2021-01-08
(1) extraction of chlorophyl pigment in leaves: 0.5g fresh leaves cut into pieces into 10ml or 20ml plug test tubes, add 10ml or 20ml of acetone: alcohol : Water: 5:5:1 mixture, covered with plugs, placed in a temperature tank at 40 degrees C immersion (3 hours or more), until the leaves fade white, you can use the test tube solution for quantitative determination.
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Determination of the photoresoluing rate of plant leaves (improved half-leaf method)
Time of Update: 2021-01-08
In order to prevent photochemists from being exported from the leaves, ring cutting can be used on the leaf handles of gemine-leaf plants, hot water on the leaf base of single-leaf plants, or damage to the living cells of the ligaments by treating the protein precipitate), which almost does not affect the delivery of water and inororgent salts to the leaves.
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The organization and cultivation of orchids
Time of Update: 2021-01-08
frenchman, .M. Morel) first applied tissue culture techniques to orchids, cultured with stem top tissue, and obtained plants through primary spheres. the use of tissue culture for germ proliferat
