leaves. It requires using a blade or scalpel to cut off the cross section of the leaf including an enlarged part which is the midrib that is located in the lamina and has fine extensions called veins. Some leaves are flat and wide; others are spiky and thin. Three distinguishable areas such as‚ the upper and lower epidermis that are perforated by small openings called stomata‚ mesophyll and the vascular tissue was revealed. INTRODUCTION Leaf is the primary photosynthetic organ of most
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evaporated substances to the gas chromatograph column where the separation will then take place (www.gas-chromatography.net). High performance (or high pressure) liquid chromatography (HPLC) – is an effective type of column chromatography which is widely used in pharmaceuticals. It is very useful to determine the assay and related substances in drug substances. In general HPLC is used to separate the components of a mixed drug substance. In HPLC chromatography‚ column plays a significant role in separation
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Determination of Gatifloxacin and Ornidazole in Tablet Dosage Forms by High-Performance Thin-Layer Chromatography 43 A simple and sensitive high-performance thin-layer chromatography method has been developed for the quantitative estimation of gatifloxacin and ornidazole in its combined dosage forms. Gatifloxacin and ornidazole were chromatographed on silica Gel 60 F254 TLC plate using n-butanol: methanol: ammonia (6 M) (8:1:1.5 v/v) as the mobile phase and scanned at 302 nm using a Camag TLC Scanner
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determining if there is pollution and contaminants in water samples from rivers or lakes. Gas chromatography uses helium to move gaseous materials through a column which can absorb various things. It is often used in forensics to analyze blood and fibers found on a body or crimescene. It can also be used to detect bombs in airports. Finally thin-layer chromatography is used to check for the purity of organic compounds using glass or plastic plates with absorbent materials on them. This type of chromatography
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resurfacing is a procedure of skin resurfacing that makes the use of laser for treating minor flaws on your face or to enhance the skin appearance. It is usually done with two kinds of laser. One is ablative or wounding laser that eliminates thin skin layers and the other being a non-ablative or non-wounding laser that boosts the growth of collagen and tightens up the underlying skin. Non-ablative laser resurfacing being less invasive requires little time for recovery. However it is not as effective
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chemicals. HFCS is found in processed foods such as salad dressing and soda. Your body does not recognize it as food so it shunts the HFCS to a fat cell and that is what causes weight gain. 3. The 4 parts of the vertebral column plus 1 “special” part- The four parts of the vertebral column are made up of twenty nine vertebrae each separated by an intravertebral disc which absorbs shock to the vertebrae. The first part is called cervical vertebrae‚ there are seven of them‚ they are the smallest vertebrae
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Cuboidal Single layer of cube/oval like cells‚ cells are not packed together Simple Columnar (stomach) Single layer of different sized tall‚ narrow cells‚ connective tissue Simple Columnar (duodenum) Columnar cells‚ brush border‚ basement membrane‚ goblet cells‚ connective tissue. Stratified Squamous (keratinized) Multiple cell layers with cells becoming increasingly flat and scaly toward surface Stratified Squamous (non-keratinized) Cells long flat cell boarded by a darker layer of cells
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nature of agarose‚ a solution of agarose can be heated and cooled to form a gel in a casting tray. Think of casting the agarose gel like pouring hot gelatin into a mold. The hot agarose liquid is poured into a casting tray. Once the mixture cools‚ a thin agarose brick will form. To ensure there’s a place to put the DNA in the gel‚ a comb is placed in the agarose liquid before it cools. Each tooth in the comb will become a hole‚ or ’well‚’ in the solidified agarose gel. Once cast‚ this gel is placed
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walls are composed of compact bone. The medullary cavity is lined with a thin membrane called the endosteum and is filled with yellow bone marrow. The enlarged ends of a long bone are called the epiphyses. The epiphyses are composed largely of spongy bone that contains the red bone marrow. The epiphyses are covered by a thin layer of hyaline cartilage in the joints. Areas of the bone other than at the joints are covered with a layer of fibrous connective tissue called the periosteum. II. Bone Growth
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Experiment 2: IDENTIFICATION OF UNKNOWNS BY TLC AND MP IN COMBINATION Introduction: Thin layer chromatography (TLC) is one of the most valuable techniques in organic chemistry. This is a best method of separating and identifying mixtures of two or more compounds. The separation is accomplished by the distribution of the mixture between two phases: one that is stationary and one that is moving or mobile. Chromatography works on the principle that different compounds will have different
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