[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-398701-105":59,"doc-detail-398701-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","biochemical-tests-practical-microbiology-lec-imvic-tests","Biochemical Tests - Practical Microbiology Lec. - IMViC Tests","","Practical microbiology lecture notes on biochemical tests used in the lab to identify bacteria through enzyme activity. The material explains how enzymes lower activation energy, outlines enzyme types by reaction location and by production mode, and summarizes key rules for interpreting results. It then presents IMViC tests for differentiating Gram-negative enterobacteriaceae, including indole, methyl red, Voges-Proskauer, and citrate utilization, with clear principles and positive/negative reaction descriptions.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/biochemical-tests-practical-microbiology-lec-imvic-tests/398701/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/biochemical-tests-practical-microbiology-lec-imvic-tests/398701.png","ImageObject",300,407,{"name":92,"@type":93},"Grenda","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-31","2026-09-27",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the main purpose of biochemical tests in the microbiology lab?","Question",{"text":112,"@type":113},"Biochemical tests rely on bacterial enzymes to identify bacteria and distinguish between bacterial species based on their biochemical activities.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are enzymes classified according to the lecture notes?",{"text":117,"@type":113},"Enzymes are classified by the site of reaction (endoenzymes inside the cell vs exoenzymes outside) and by enzyme production (inducible produced only when needed vs constitutive produced continuously).",{"name":119,"@type":110,"acceptedAnswer":120},"What do the IMViC tests differentiate?",{"text":121,"@type":113},"The IMViC tests are used to differentiate Gram-negative bacilli, particularly among members of the family Enterobacteriaceae, using indole, methyl red, Voges-Proskauer, and citrate reactions.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},398701,1790852506,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":56,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144,"preview_page_count":4},7971474921005,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","J.M.U  \nBiochemical Tests  \nPractical Microbiology lec.  \n1 st Semester  \nDr.Majida Malik Alshammari Dr. Athraa Jaleel  \nBiochemical tests  \n⚫In the microbiology lab, biochemical test relays on enzymes which is glycoprotein or protein that act as catalyst by lowering the activation energy of certain biological reaction.  \nenzyme  \nsubstrate  product  \n⚫We can use our knowledge in bacterial enzymes to identify the bacteria and distinguish between bacterial species.  \nTypes of enzyme  \n1. According to site of the reaction  \na. Endoenzymes : where substrate and enzyme react inside the cell. (ex: oxidase, catalase, urease).  \nb. Exoenzymes: where substrate and enzyme react outside the cell. (ex: free coagulase, gelatenase, amylase).  \n2. According to enzyme production  \na. Inducible : produced only when needed or induced.  \nb. Constitutive : produced continuously  \nNotes  \n1. Every genus of bacteria has it’s unique set of enzymes, so we can identify it.  \n2. Endoenzymes may act outside the cell in case of the presence of high concentration of it’s substrate.  \n3-The same enzyme could be inducible and constitutive in different genera  \nIMViC testes  \nThis test that are used to differentiate among the Gram-Negative bacilli  \nin of enterobacteriaceae.  \n1 Indole test  \nPrinciple:  \n⚫ Indole test is performed to determine the ability of the bacteria to degrade tryptophan molecule into Indole. Bacteria that possess the enzyme tryptophanase are capable of hydrolyzing tryptophan with the production of Indole, Pyruvic acid and ammonia.  \n⚫ This test is performed to help differentiate species of the family Enterobacteriaceae.  \nResults:  \nPositive test: The ring of red colour on the surface of broth medium. E.coli Proteus vulgaris  \nNegative test : The ring don’t form Salmonella spp. Klebsiella spp. Enterobacter aerogens  \n5  \n2-Methyl Red test  \nPrinciple  \nThis test determines whether the microbe performs mixed acids fermentation when supplied glucose. Fermentation products help to differentiate various genera of enteric bacteria.  \nResults  \nPositive test : When the culture medium turns red after addition of methyl red, because of a pH at or below 4 .4 from the fermentation of glucose. ex. E. coli,  \nsalmonella, proteus  \nNegative test : Yellow colour (indicating no acid) production.  \nEx.Enterobacter , Klebsiella spp.  \n6  \n3-Voges Proskauer Test (acetoin production)  \nPrinciple:  \n⚫ Many bacteria ferment carbohydrate with production acetyl methyl carbinol (acetoin) .This test used to determine the ability of the bacteria to produce neutral end product of (acetoin) from glucose fermentation.  \nResults  \nPositive : Pinkish red color at the surface of the medium. Klebseilla  \npneumoniae  \nEnterobacter  \nNegative : Yellow color at the surface of the medium. E.coli  \nResults of Methyl red and Voges-proskauer tests  \n4-Citrate Utilization test:  \nPrinciple:  \nSimmons citrate medium is used totest an microb´s ability to utilize citrate as a source of energy. The medium  \ncontains citrate as the sole carbon source and inorganic ammonium salts (NH4H2PO4) asthe sole source of nitrogen.  \nthe indicator is bromothymol blue.  \nResults  \nPositive test: Appearance of growth and blue colour due to alkaline reaction following citrate utilization. Klebsiella pneumoniae  \nNegative test: No growth and original green colour E . coli  \n􀂙 Nitrate Reduction Test  \nPrinciple  \nNitrate reduction test is used for the differentiation of types of Enterobacteriaceae on the basis of their ability to produce nitrate reductase enzyme that hydrolyze nitrate (NO3–) to nitrite (NO 2–) which may then again be degraded to various nitrogen products depending on the enzyme system of the microbes.  \nResults:  \nPositive test: Red colour (B) Neisseria mucosa, E.coli Negative test: yellow colour (A),Acinitobacter,other Neisseria spp  \nEnterobacteriaceae(+)  \n10","cbCaidTXMGiD6yX1","https://ap.wps.com/l/cbCaidTXMGiD6yX1","pdf",1101236,"English","# Biochemical Tests\n## Enzymes and Their Role in Identification\n## Types of Enzymes\n## Notes for Interpretation\n## IMViC Tests\n### Indole Test\n### Methyl Red Test\n### Voges-Proskauer Test\n### Citrate Utilization Test","[{\"question\":\"What is the main purpose of biochemical tests in the microbiology lab?\",\"answer\":\"Biochemical tests rely on bacterial enzymes to identify bacteria and distinguish between bacterial species based on their biochemical activities.\"},{\"question\":\"How are enzymes classified according to the lecture notes?\",\"answer\":\"Enzymes are classified by the site of reaction (endoenzymes inside the cell vs exoenzymes outside) and by enzyme production (inducible produced only when needed vs constitutive produced continuously).\"},{\"question\":\"What do the IMViC tests differentiate?\",\"answer\":\"The IMViC tests are used to differentiate Gram-negative bacilli, particularly among members of the family Enterobacteriaceae, using indole, methyl red, Voges-Proskauer, and citrate reactions.\"}]","Biochemical Tests - Practical Microbiology Lec. - IMViC Tests | PDF",1790488276,48]