| 词汇 | example_english_fixative |
| 释义 | Examples of fixativeThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Effect of fixatives on fracture plane in red blood cells. In addition, many fixatives chemically alter the fixed material to make it less palatable (either indigestible or toxic) to opportunistic microorganisms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Fixatives containing mercuric chloride or potassium dichromate are toxic, making disposal as hazardous waste costly. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Most chemical fixatives (chemicals causing fixation) generate chemical bonds between proteins and other substances within the sample, increasing their rigidity. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The balsam and its oil are used as fixatives in soap perfumes and fragrances. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Enucleated eyes were immediately placed into ice-chilled fixative as appropriate to each method below!. The most common precipitating fixatives are ethanol and methanol. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Fixatives are toxic to most common microorganisms (bacteria in particular) that might exist in a tissue sample or which might otherwise colonise the fixed tissue. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All viscera were systematically checked under stereoscopic microscope and all helminths found were removed and preserved with fixative agents. All helminths were removed and placed in vials containing fixative (10% formalin for taeniid larvae and hot 70% alcohol for roundworms). Other research has found that fixatives in polycarbonate plastics can cause chromosomal error in cell division called aneuploidy. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Also, note that there was only paraformaldehyde in the primary fixative. The fixative and sucrose are able to diffuse through the foam, cryoprotecting and postfixing the specimen. The mature egg was fixed in methanol fixative. Each oocyte was placed individually on a glass slide, and several droplets of fixative were placed on the oocyte. At the end of the culture, the oocytes were transferred to a primary fixative. The brain was blocked in the frontal stereotaxic plane and removed for a 1-h postfixation in the same fixative. The fixative was spread by continuous and gentle blowing until the disappearance of the cytoplasm. Certain manufacturers produce fixatives specified for a certain media only, such as soft pastel fixatives. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. During fixation, the hearts were suspended freely in continuously stirred fixative. There was also a limited number of dyes and fixatives available prior to the middle of the 19th century. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. After 24 h the fixative was renewed and the nodules were stored in the same fluid prior to sectioning. The flukes were subsequently free-fixed in fresh fixative for a further 4 h at room temperature. To aid fixative penetration, the bodies of worms were cut transversely into sections 2 - 3 mm in length. Many resins, wood scents, and amber bases are used as fixatives. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. All helminths found were removed and placed in vials containing fixative agents. Only permeable seeds imbibed the glutaraldehyde fixative during preparation for microscopic analysis. As an additional fixation, the posterior half of the eye was immersed in the same fixative for 3 h at room temperature. The sclera was sliced open to admit fixative and in a manner to define the orientation of the eye. The use of sucrose in the fixative we employed, we assume to have reduced this value. The fixative was spread by continuous and gentle blowing until the cytoplasm disappeared. Neonatal kittens were also per fused intracardially with the same fixative using the same procedures except that they were not artificially respirated. Prenatal kittens were injected with ketaminexylazine and per fused intracardially with the same fixative using a 28-gauge needle and infusion pump. Ten minutes later, the retinae were dissected from the eyecup and placed in fresh fixative. The eyeballs and brains were removed and postfixed for 1 h in the same fixative. In fall, spices would be added to the unsightly grey mix until a pleasant fragrance was achieved, then scent preserving fixatives (see below) were added. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Finally, fixatives often alter the cells or tissues on a molecular level to increase their mechanical strength or stability. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The precipitation and aggregation of proteins is a very different process from the crosslinking that occurs with the aldehyde fixatives. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Modern fixatives are usually alcohol based, and hydrocarbon propelled. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Common fixatives include formaldehyde, ethanol, methanol, and/or picric acid. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. No influence of the fixative was recorded (data not shown). After centrifugation at 1500 g for 5 min the supernatant (fixative) was discarded. Although a high glutaraldehyde fixative might have maintained this attachment, glutaraldehyde was incompatible with the immunohistochemical studies performed on these eyes. Additional fixation with fresh fixative was performed for 2-8 h followed by postfixation with 1% osmium tetroxide. Eyes were placed in cold fixative composed of 38% formaldehyde diluted in 9 parts ethanol. The current decreased, attaining a minimum 2.7 s after addition of fixative, then increased precipitously, at which time the voltage clamp was switched off. The eye was immersion fixed overnight in the same fixative and then dehydrated through 95% ethanol, 100% ethanol, and toluene. An embryo was then placed on a glass slide and re-fixed with several drops of the same fixative, and marked on the reverse side. The occipital lobes were placed into fixative 11 h after death. They were perfused with fixative by intracardial injection, eyes were enucleated, and an incision was made across the cornea or near the limbus to facilitate penetration of fixative. A rapid method for the transfer of nematodes from fixative to anhydrous glycerine. Before the last drop of fixative had evaporated completely, the slides were progressively dehydrated in ethanol (50%, 75%, and twice in 100%) and covered with 1% collodion in isoamyl acetate. Our rapid freezing data, showing extracellular matrix deep within the biofilm, indicate that the lack of ruthenium red staining was probably due to restricted accessibility of the fixative. 152 stored in the fixative. A formaldehyde-glutaraldehyde fixative of high osmolality for use in electron microscopy. Synthetic fixatives include substances of low volatility (cyclopentadecanolide, ambroxide, benzyl salicylate) and virtually odorless solvents with very low vapor pressures (benzyl benzoate, diethyl phthalate, triethyl citrate). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. With the exception of samples stored in 80% ethanol, all eggs were first rinsed twice in 20% ethanol to remove any fixative then held in 20% ethanol overnight. Fixatives are more often than not highly toxic and potential health hazards to the respiratory system, hence should only be used in a well ventilated area. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Intracellular localization of oligonucleotides : influence of fixative protocols. To assess the effect of fixative on the activation current, eggs in which the seal between the egg and the electrode was broken were eliminated from consideration. A derivative of ambergris is used in the perfumery industry as a fixative for delicate scents. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Coagulants act as fixative for various chemicals such as dyes and sizing agents, charge neutralization for pitch and cationic demand control. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The acetic acid in this fixative lyses red blood cells and dissolves small iron and calcium deposits in tissue. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. First, a fixative usually acts to disable intrinsic biomoleculesparticularly proteolytic enzymeswhich otherwise digest or damage the sample. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Using a larger sample means it takes longer for the fixative to reach the deeper tissue. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Glutaraldehyde is used in biological electron microscopy as a fixative. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Sterilization of blocks of tissue can take much longer, due to the time required for the fixative to penetrate. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Bouin solution is a common picric acid-containing fixative solution used for histology specimens. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The substance has been extensively used as a perfume fixative, incense material, and medicine, since ancient times. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Modern embalming is not done with a single fixative. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Benzoin resin is a common ingredient in incense-making and perfumery because of its sweet vanilla-like aroma and fixative properties. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. He used alcohol as a fixative and developed a staining technique that allowed the demonstration of several new nerve-cell constituents. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Paraformaldehyde is not a fixative--it must be depolymerized to formaldehyde in solution. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Without a fixative, the soft pastel is more likely to crumble in the users hands. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The surface of an oil pastel painting is therefore less powdery, but more difficult to protect with a fixative. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Abrasive supports avoid or minimize the need to apply further fixative in this way. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Osmium tetroxide is often used as a secondary fixative when samples are prepared for electron microscopy. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Second, a fixative typically protects a sample from extrinsic damage. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The fixative must diffuse through the tissue to fix, so tissue size and density, as well as type of fixative must be considered. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The substance has been used as a popular perfume fixative since ancient times and is one of the more expensive animal products in the world. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The tissue is removed from the body or plant, and then placed in a fixative which stabilizes the tissues to prevent decay. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The scrapings are placed on a slide, covered with a fixative for later examination under a microscope to determine if they are normal or abnormal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The tissue is removed from the body of an organism and then placed in a fixative which stabilizes the tissues to prevent decay. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The brush is removed and placed directly in the fixative solution. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Artwork media requiring fixative include drawings done in pencil, charcoal, and pastel. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Alum was important to the textile industry because it was used as a mordant or fixative for dyes that were used to colour cloth. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Unfertilised, immature and mature oocytes were also prepared with the two fixatives described above. Both groups of fixatives have advantages and disadvantages. Considering their effect on proteins, fixatives in general can be divided into two types: "coagulant" or "non-coagulant". Due to extraction of membrane structures by such fixatives it is not necessary to add detergents during staining with membrane impermeable probes such as antibodies. Several different fixatives were tested with each antibody on frozen sections to optimize staining sensitivity. However, the denaturation of proteins seen with these fixatives has disadvantages for some probes and for visualizing intact cell surfaces. Because the activation current is virtually the same from one egg to another, deviations of the current due to addition of fixatives can be ascertained. After methanol or ethanol fixation, some cells were partially detached and changed their shape, but this did not occur with other coagulant fixatives. The coagulant fixatives, including methanol, ethanol, acetone, and trichloroacetic acid, denature and precipitate proteins. From this standpoint, the fusion event would be detectable by electron microscopy using chemical fixatives only after the components at the fusion site had become relatively stable structures. One half of the bladder and a piece of the ventral lobes of the prostate were then placed in fixative overnight. The use of uranyl acetate as a tertiary fixative and en bloc stain has revealed the heptalaminate nature of the outer membrane. If cytoplasm remained, it was removed by spreading one drop of another fixative, a mixture of methanol and acetic acid. A very small volume of fixative (methanol 3 : acetic acid 1) was poured into the hypotonic solution. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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