nuclear membrane disintegrates. Chromosomes join at points called chiasmata where crossing over takes place. Metaphase I The nuclear membrane completely disappears. Spindle fibres attach to the chromosome’s centromeres and homologous pairs move together and line up along the metaphase plate. Anaphase I Spindle fibres pull homologous chromosomes towards opposite poles of the cell. This separates the chromosomes into two haploid set. Telophase I The homologous chromosomes arrive at there
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BTEC Level 3 Applied Science Unit 1 – examiners report: Achieves P5‚ M2 needs to discuss different tissue types to achieve D2. In this essay I will include information regarding: cell differentiation‚ the functions of various cell organelles‚ tissues and a comparison of different tissue types. Cellular differentiation is the process by which a less specialised cell becomes a more specialised cell type. Differentiation happens a number of times during the development of a multicellular organism as
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up. The third exercise is the leg press. This exercise targets all the muscles in the legs such as the quadriceps‚ gluteus maximus and hamstrings. The The weights programme has been designed for many reasons such as to target all types of muscle fibres through each exercise. The function of the muscular system is very important and is a big part of why I chose
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nowadays they use some machines (friezing machines) to produce it. The features of the fabric guarantee also the perfect heat insulation‚ in addition to the perspiration of the human body. Baby Alpaca fibre Irresistibly soft and lofty‚ Baby Alpaca DK is gently spun from the finest baby alpaca fibre. Its versatile weight and luxurious drape makes it ideal for a variety of elegant accessories and garments. While similar to sheep’s wool‚ it is warmer‚ not prickly‚ and has no lanolin‚ which makes it
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spiral turns given to yarn in order to hold the fibres or threads together. Twist is necessary to give a yarn coherence and strength. Twist is primarily instructed in to a staple yarn in order to hold the constituent fibres together‚ thus giving strength to the yarn. False twist is used in textured yarns. The effects of the twist are twofold: As the twist increases‚ the lateral force holding the fibres together is increased so that more of the fibres are contributed to the overall strength of the
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$ 2 5 / m Si lk -‐ -‐ natural protein fibre protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The shimmering appearance of silk is due to the triangular prism-‐like structure of the silk fibre -‐ -‐ -‐ versatile and very comfortable
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Although paper is etymologically derived from papyrus‚ the two are produced very differently and the development of modern paper is separate from the development of papyrus. Papyrus is a "lamination of natural plants‚ while paper is manufactured from fibres whose properties have been changed by maceration or disintegration.[1] Papermaking Main article: Papermaking Chemical pulping Main articles: kraft process‚ sulfite process‚ and soda pulping To make pulp from wood‚ a chemical pulping process
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Silkworm larvae are fed mulberry leaves‚ and‚ after the fourth moult‚ climb a twig placed near them and spin their silken cocoons. This process is achieved by the worm through a dense fluid secreted from its gland structural glands‚ resulting in the fibre of the cocoon. The silk is a continuous-filament fiber consisting of fibroin protein‚ secreted from two salivary glands in the head of each larva‚ and a gum called sericin‚ which cements the two filaments together. The sericin is removed by placing
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expectations help the company keep well motivated work teams who are self driven with good moral. 1.2 The objective for my team is to ensure we supply our customers (the other departments in our company) with enough optical fibre to meet the order demand for all the different types of fibre laser we manufacture. To help us meet this objective we use a system of KPI’s (Key Performance Indicators) to indicate to us the current level of various indicators throughout
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Connective Tissue As the name implies‚ connective tissue serves a "connecting" function. It supports and binds other tissues. Unlike epithelial tissue‚ connective tissue typically has cells scattered throughout an extracellular matrix. Loose Connective Tissue In vertebrates‚ the most common type of connective tissue is loose connective tissue. It holds organs in place and attaches epithelial tissue to other underlying tissues. Loose connective tissue is named based on the "weave" and type
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