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Closed Style - Style of Stigma Interaction
Cotton shows an epidermis with stomata, a cortex of thin-walled parenchyma with several vascular bundles and strands of transmitting tissue. The cells of transmitting tissue have thin transverse walls but lateral walls are thick and consist of several distinct and concentric layers. The innermost wall layer 1, is composed of pectic substances and hemicellulose, surrounding this is wall layer 2 which is darker, thinner and similar to wall layer 1 -in composition with a large hemicellulose content. Wall layer 3 is loosely textured rich in pectin substances and contains small amounts of noncellulosic polysaccharides and cellulose but poor in hemicellulose. Wall layer 4 is represented by the middle lamella region and is primarily pectic in nature.
Small amounts of protein is also present in layers 3.4 (3 also contains masses of small vesicles). The cells of transmitting tissue contain many mitochondria and active vesicles forming dictyosomes. The plastids are large with numerous amyloplasts, polysomes and abundant rough ER. Transmitting tissue cells have a spherical or slightly ellipsoidal vacuole. Nuclei are large and frequently lobed indicating their active metabolic state. EM studies of transmitting tissue in Petunia, Lycopersicon and Nicotiana and some other taxa show that the cells in general have thin walls traversed with plasmodesmata.
Preoperative antibiotics Preoperative antibiotics can decrease the incidence of infection after colorectal surgery; for elective operations, an oral regimen of neomycin (not a
Suppose you are in charge of designing a microcontroller-based system for a packet processing application. These are high speed internet packets from the PC that are going to be pr
Define the meaning of Open Kettles? A number of foods can be satisfactorily concentrated in open kettles which are heated by steam. This is the case for jellies and jams, toma
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How many asymmetric carbons does the amino acid serine have? Please explain with a strucutral diagram if possible.
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Which of the following is true for the sodium-glucose co-transporter? A. The net flux of sodium ions is from a region of high sodium ion concentration to a region of low sodium
Q. What is the crossing over? And In which period of meiosis does this event occur? Crossing over is the eventual exchange of chromosomal fragments among homologous chromosomes
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