BISC209: Lab7 - Revision history

Janet McDonough: /* Culturable Bacteria Characterization continued */

2010-03-16T13:38:17Z

Culturable Bacteria Characterization continued

←Older revision		Revision as of 13:38, 16 March 2010
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	Concentrate on completing and evaluating the tests you have in process on your isolates (use the appropriate protocols-refer to LABS 5 and 6; in the Protocols section: Enzymes, Motility, and Carbohydrate Fermentation sections, addition to the Roles protocols.<BR><BR>		Concentrate on completing and evaluating the tests you have in process on your isolates (use the appropriate protocols-refer to LABS 5 and 6; in the Protocols section: Enzymes, Motility, and Carbohydrate Fermentation sections, addition to the Roles protocols.<BR><BR>
	Continue with/add new differential ID tests such as an SPECIAL STAINS (see the Special Stains section in the Protocols) that seem appropriate. For example, all Gram positive bacilli or any bacteria that showed unstained area in the cells when Gram stained should be stained for endospores. <BR><BR>		Continue with/add new differential ID tests such as an SPECIAL STAINS (see the Special Stains section in the Protocols) that seem appropriate. For example, all Gram positive bacilli or any bacteria that showed unstained area in the cells when Gram stained should be stained for endospores. <BR><BR>
-	All bacteria that were positive or ambiguous for motility in SIMs medium should be looked at in a wet mount and if positive in the wet mount, you could try the Flagella stain. All the "swarmers" (those bacteria that ~~made lawns~~ all over the plate)should be looked at in a wet mount too.<BR><BR>	+	All bacteria that were positive or ambiguous for motility in SIMs medium should be looked at in a wet mount and if positive in the wet mount, you could try the Flagella stain. All the "swarmers" (those bacteria that spread all over the plate)should be looked at in a wet mount too.<BR><BR>
-	Highly mucoid colonies should be tested for the presence of a capsule using the capsule stain protocol. <Br><BR>	+	Highly mucoid (sticky and wet) colonies should be tested for the presence of a capsule using the capsule stain protocol. <Br><BR>
	If your Gram stain results were ambiguous or not what you expected from the descriptions of the bacteria that grow on the Enrichment media you used, you should probably repeat those Gram stains. Getting the Gram reaction right is crucial to the discussion of where these bacteria belong phylogenically and functionally. <BR><BR>		If your Gram stain results were ambiguous or not what you expected from the descriptions of the bacteria that grow on the Enrichment media you used, you should probably repeat those Gram stains. Getting the Gram reaction right is crucial to the discussion of where these bacteria belong phylogenically and functionally. <BR><BR>


-	If there extra test ~~medium is~~ available you may repeat any other tests that were ambiguous or add any you think might be useful for identifying your organism. You can also make a list of tests that would allow you to identify your isolates to species ~~but~~ were not available.	+	If there are extra test media available you may repeat any other tests that were ambiguous and/or add any you think might be useful for identifying your organism. You can also make a list of tests that would allow you to identify your isolates to species that were not available this year.

-	By this point, you should be wrapping up the testing, beginning to discard your plates and ~~check~~ with the instructor about freezing ~~glcerol~~ stocks of some of the isolates.	+	By this point, you should be wrapping up the testing, beginning to discard your plates and checking with the instructor about freezing glycerol stocks of some of the isolates.

-	~~Are you~~ using the data sheet (located in the Data folder of the lab conference) or one of your own design? Organization of all this information is key. Be sure that you have added the unique code numbers for your isolates so we can correlate identity from sequencing with your functional, morphologic, and metabolic tests. If you are pretty sure you know the genus of an isolate from our characterization tests, please add that as well.	+	Pleaes start using the data sheet (located in the Data folder of the lab conference) or one of your own design to leave an electronic record of the isolates you have worked with this term. Organization of all this information is key. Be sure that you have added the unique code numbers for your isolates so we can correlate identity from sequencing with your functional, morphologic, and metabolic tests. If you are pretty sure you know the genus of an isolate from our characterization tests, please add that as well.

	==CLEAN UP==		==CLEAN UP==

Janet McDonough: /* Culturable Bacteria Characterization continued */

2010-03-16T13:32:36Z

Culturable Bacteria Characterization continued

←Older revision		Revision as of 13:32, 16 March 2010
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	Continue following the protocols for [[BISC209: Roles of soil Microbes \|Tests to determine the role of a soil isolate]]<BR><BR>		Continue following the protocols for [[BISC209: Roles of soil Microbes \|Tests to determine the role of a soil isolate]]<BR><BR>
-	Concentrate on completing and evaluating the tests you have in process on your isolates(use the appropriate protocols-refer to LABS 5 and 6; in the Protocols section: Enzymes, Motility, and Carbohydrate Fermentation sections, addition to the Roles protocols.<BR><BR>	+	Concentrate on completing and evaluating the tests you have in process on your isolates (use the appropriate protocols-refer to LABS 5 and 6; in the Protocols section: Enzymes, Motility, and Carbohydrate Fermentation sections, addition to the Roles protocols.<BR><BR>
	Continue with/add new differential ID tests such as an SPECIAL STAINS (see the Special Stains section in the Protocols) that seem appropriate. For example, all Gram positive bacilli or any bacteria that showed unstained area in the cells when Gram stained should be stained for endospores. <BR><BR>		Continue with/add new differential ID tests such as an SPECIAL STAINS (see the Special Stains section in the Protocols) that seem appropriate. For example, all Gram positive bacilli or any bacteria that showed unstained area in the cells when Gram stained should be stained for endospores. <BR><BR>
	All bacteria that were positive or ambiguous for motility in SIMs medium should be looked at in a wet mount and if positive in the wet mount, you could try the Flagella stain. All the "swarmers" (those bacteria that made lawns all over the plate)should be looked at in a wet mount too.<BR><BR>		All bacteria that were positive or ambiguous for motility in SIMs medium should be looked at in a wet mount and if positive in the wet mount, you could try the Flagella stain. All the "swarmers" (those bacteria that made lawns all over the plate)should be looked at in a wet mount too.<BR><BR>

Janet McDonough: /* LAB 7: Characterization of culturable soil bacteria */

2010-03-16T13:32:13Z

LAB 7: Characterization of culturable soil bacteria

←Older revision		Revision as of 13:32, 16 March 2010
Line 10:		Line 10:
	Before we get to work on characterizing our isolates, be aware of where are in indentification of those bacteria by 16s rDNA sequencing.<BR><BR>		Before we get to work on characterizing our isolates, be aware of where are in indentification of those bacteria by 16s rDNA sequencing.<BR><BR>

-	We have sent out all the amplicons that you prepared last week for DNA sequencing of the 16s rRNA gene. We must also send an appropriate primer. What's the sequence of such an appropriate primer? What's going on in those automatic sequencing machines in Danvers? Make sure you understand how Sanger sequencing works. We should have the data back by ~~LAB9~~ when we are ~~schedule~~ to meet in a computer lab and learn to analyze the data generated so we can find out, we hope, a lot about the diversity of the soil bacteria in our habitat of interest.	+	We have sent out all the amplicons that you prepared last week for DNA sequencing of the 16s rRNA gene. We must also send an appropriate primer. What's the sequence of such an appropriate primer? What's going on in those automatic sequencing machines in Danvers? Make sure you understand how Sanger sequencing works. There will be some theoretical questions in the lab practical. We should have the sequencing data back by LAB 9 when we are scheduled to meet in a computer lab and learn to analyze the data generated so we can find out, we hope, a lot about the diversity of the soil bacteria in our habitat of interest.

	==Culturable Bacteria Characterization continued==		==Culturable Bacteria Characterization continued==

Tucker Crum: /* Assignment */

2010-03-12T16:53:40Z

Assignment

←Older revision		Revision as of 16:53, 12 March 2010
Line 58:		Line 58:
	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you assess the OF-glucose test for yellow or blue color in certain regions or tubes to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learn from that test whether or not the bacteria can catabolize peptone. What the practical will assess on the OF-glucose test is not that you can perform the test without access to the directions, but that you understand how to evaluate the results in terms of the general biological mechanism of the test (pH change) and the metabolic capabilities implied from the results (such as my description of glucose and peptone catabolism above). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch and/or what is the ingredient in the medium that allows this evaluation? <BR><BR>		In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you assess the OF-glucose test for yellow or blue color in certain regions or tubes to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learn from that test whether or not the bacteria can catabolize peptone. What the practical will assess on the OF-glucose test is not that you can perform the test without access to the directions, but that you understand how to evaluate the results in terms of the general biological mechanism of the test (pH change) and the metabolic capabilities implied from the results (such as my description of glucose and peptone catabolism above). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch and/or what is the ingredient in the medium that allows this evaluation? <BR><BR>

-	Wondering how to study? A lot of what we will evaluate you on, you already know how to do in your sleep, such as streaking for isolation using proper technique. You do not have to memorize the procedures in the wiki. You will have access to the directions that are printed in the wiki for performing techniques, such as Gram staining; however, you will not have access to the theoretical background information about those tests, such as the cell structural differences that the Gram stain uses as its differentiating principle. You should know that sort of information by studying the background information found in the Protocols section of the wiki for all the work that have you performed this semester. The protocols in the wiki that describe tests that you have not done (like Enterotubes) are NOT included in the practical. However, even if you didn't do or get a positive test from those tests performed on your isolates, you should know how to evaluate the tests we all set up, such as the Oxyswab test or the SIMS medium and to recognize a positive vs. a negative. We will try to have some examples of positive tests in the lab for you to review, including positive endospore and capsule stains on demo slides. We will also have some reagents, such as the hydrogen peroxide, available if you want to redo tests on your isolates for practice at assessment. However, not all of the tests can be kept around for study as the reagents are labile or because the results change with time. <BR><BR>	+	Wondering how to study? A lot of what we will evaluate you on, you already know how to do in your sleep, such as streaking for isolation using proper technique. You do not have to memorize the procedures in the wiki. You will have access to the directions that are printed in the wiki for performing techniques, such as Gram staining; however, you will ''not'' have access to how to read those tests or to the theoretical background information about those tests, such as the cell structural differences that the Gram stain uses as its differentiating principle. You should know that sort of information by studying the background information and protocols found in the Protocols section of the wiki for all the work that have you performed this semester. The protocols in the wiki that describe tests that you have not done (like Enterotubes) are NOT included in the practical. However, even if you didn't do or get a positive test from those tests performed on your isolates, you should know how to evaluate the tests we all set up, such as the Oxyswab test or the SIMS medium and to recognize a positive vs. a negative.<BR><BR>

	Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ARE practical material. Your homework assignment for last week should be a good study guide for that material as is all of the background information in the wiki in LABS 1-6 and in the general information page for our project in the main menu.<BR><BR>		Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ARE practical material. Your homework assignment for last week should be a good study guide for that material as is all of the background information in the wiki in LABS 1-6 and in the general information page for our project in the main menu.<BR><BR>

Tucker Crum: /* Assignment */

2010-03-11T16:42:17Z

Assignment

←Older revision		Revision as of 16:42, 11 March 2010
Line 56:		Line 56:
	==Assignment==		==Assignment==
	Study for your '''Lab Practical'''. <BR><BR>		Study for your '''Lab Practical'''. <BR><BR>
-	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you ~~read~~ yellow or blue color ~~production~~ in certain regions or tubes ~~of the OF/Glucose test~~ to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also ~~learned~~ from that test whether or not ~~that isolate could~~ catabolize peptone. What the practical will assess is not that you ~~know how to~~ perform the test ~~or that you are looking for a yellow or blue color change~~, but that you understand how to evaluate the results in terms of metabolic capabilities (such as my description of glucose and peptone catabolism). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch? <BR><BR>	+	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you assess the OF-glucose test for yellow or blue color in certain regions or tubes to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learn from that test whether or not the bacteria can catabolize peptone. What the practical will assess on the OF-glucose test is not that you can perform the test without access to the directions, but that you understand how to evaluate the results in terms of the general biological mechanism of the test (pH change) and the metabolic capabilities implied from the results (such as my description of glucose and peptone catabolism above). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch and/or what is the ingredient in the medium that allows this evaluation? <BR><BR>

-	Wondering how to study? A lot of what we will evaluate you on, you already know how to do in your sleep, such as streaking for isolation using proper technique. You do not have to memorize the procedures in the wiki. You will have access to the directions that are printed in the wiki for techniques, such as Gram staining~~, that you are asked to perform during the practical~~; however, you will not have access to the theoretical background information about those tests, such as the cell structural differences that the Gram stain uses as its differentiating principle. You should know that sort of information by studying the background information found in the Protocols section of the wiki for all the work that you performed. The protocols in the wiki that describe tests that you have not done (like Enterotubes) are NOT included in the practical. However, even if you didn't do or get a positive test from those tests performed on your isolates, you should know how to evaluate the tests we all set up, such as the Oxyswab test, and to recognize a positive vs. a negative. We will try to have some examples of positive tests in the lab for you to review, including ~~slides with~~ positive endospore and capsule stains on demo slides. We will also have some reagents, such as the hydrogen peroxide, available if you want to redo tests on your isolates for practice at assessment. However, not all of the tests can be kept around for study as the reagents are labile or because the results change with time. <BR><BR>	+	Wondering how to study? A lot of what we will evaluate you on, you already know how to do in your sleep, such as streaking for isolation using proper technique. You do not have to memorize the procedures in the wiki. You will have access to the directions that are printed in the wiki for performing techniques, such as Gram staining; however, you will not have access to the theoretical background information about those tests, such as the cell structural differences that the Gram stain uses as its differentiating principle. You should know that sort of information by studying the background information found in the Protocols section of the wiki for all the work that have you performed this semester. The protocols in the wiki that describe tests that you have not done (like Enterotubes) are NOT included in the practical. However, even if you didn't do or get a positive test from those tests performed on your isolates, you should know how to evaluate the tests we all set up, such as the Oxyswab test or the SIMS medium and to recognize a positive vs. a negative. We will try to have some examples of positive tests in the lab for you to review, including positive endospore and capsule stains on demo slides. We will also have some reagents, such as the hydrogen peroxide, available if you want to redo tests on your isolates for practice at assessment. However, not all of the tests can be kept around for study as the reagents are labile or because the results change with time. <BR><BR>

	Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ARE practical material. Your homework assignment for last week should be a good study guide for that material as is all of the background information in the wiki in LABS 1-6 and in the general information page for our project in the main menu.<BR><BR>		Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ARE practical material. Your homework assignment for last week should be a good study guide for that material as is all of the background information in the wiki in LABS 1-6 and in the general information page for our project in the main menu.<BR><BR>

Tucker Crum: /* Assignment */

2010-03-11T16:34:05Z

Assignment

←Older revision		Revision as of 16:34, 11 March 2010
Line 58:		Line 58:
	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you read yellow or blue color production in certain regions or tubes of the OF/Glucose test to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learned from that test whether or not that isolate could catabolize peptone. What the practical will assess is not that you know how to perform the test or that you are looking for a yellow or blue color change, but that you understand how to evaluate the results in terms of metabolic capabilities (such as my description of glucose and peptone catabolism). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch? <BR><BR>		In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you read yellow or blue color production in certain regions or tubes of the OF/Glucose test to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learned from that test whether or not that isolate could catabolize peptone. What the practical will assess is not that you know how to perform the test or that you are looking for a yellow or blue color change, but that you understand how to evaluate the results in terms of metabolic capabilities (such as my description of glucose and peptone catabolism). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch? <BR><BR>

-	Wondering how to study? A lot of what we will evaluate you on, you already know how to do in your sleep, such as streaking for isolation using proper technique. You do not have to memorize the procedures in the wiki. You will have access to the ~~lab manuals~~ during the practical ~~to review procedures so~~ you ~~can follow~~ those ~~directions~~. You should ~~study~~ the information in the Protocols section of the wiki ~~(including the background information)~~ for all the work that you performed. The protocols in the wiki ~~describing~~ tests that you have not done (like Enterotubes) are NOT included in the practical. However, even if you didn't do or get a positive ~~endospore or capsule stain~~, you should know how to evaluate ~~those stains~~ and recognize a positive. We will have a positive ~~endospore and capsule stain on demo slides out~~ in the lab ~~next to a microscope~~ for you to ~~come in and~~ review, if you ~~wish~~.	+	Wondering how to study? A lot of what we will evaluate you on, you already know how to do in your sleep, such as streaking for isolation using proper technique. You do not have to memorize the procedures in the wiki. You will have access to the directions that are printed in the wiki for techniques, such as Gram staining, that you are asked to perform during the practical; however, you will not have access to the theoretical background information about those tests, such as the cell structural differences that the Gram stain uses as its differentiating principle. You should know that sort of information by studying the background information found in the Protocols section of the wiki for all the work that you performed. The protocols in the wiki that describe tests that you have not done (like Enterotubes) are NOT included in the practical. However, even if you didn't do or get a positive test from those tests performed on your isolates, you should know how to evaluate the tests we all set up, such as the Oxyswab test, and to recognize a positive vs. a negative. We will try to have some examples of positive tests in the lab for you to review, including slides with positive endospore and capsule stains on demo slides. We will also have some reagents, such as the hydrogen peroxide, available if you want to redo tests on your isolates for practice at assessment. However, not all of the tests can be kept around for study as the reagents are labile or because the results change with time. <BR><BR>

	Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ARE practical material. Your homework assignment for last week should be a good study guide for that material as is all of the background information in the wiki in LABS 1-6 and in the general information page for our project in the main menu.<BR><BR>		Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ARE practical material. Your homework assignment for last week should be a good study guide for that material as is all of the background information in the wiki in LABS 1-6 and in the general information page for our project in the main menu.<BR><BR>
-
-
-

	'''Begin to finalize the characterization of your culturable isolates and start to analyze your data''' in an attempt to organize your thinking about our experimental question: What bacteria comprise the soil community in the particular habitat I am investigating and, more importantly, what are the functional and phylogenetic relationships among those bacteria that I have studied directly or that I know are there from our culture independent sequencing? We have investigated directly in your roles tests (starch digestion, antibiotic production and sensitivity, cellulose digestion, ammonification, carbohydrate and other nutrient breakdown pathways, etc. ) and we have tested directly only a few of the thousands of enzymes these bacteria may possess. We have tried to find out some things about their structure, their ability to do self directed motility, and we have looked for capabilities involved in protecting themselves from adverse environmental conditions (capsules, endospores) or from competition (antibiotic production). Don't forget to analyze the enrichment media we used. The idea of "selecting" particular bacterial group on special enrichment media is based on the ability of members of these groups to use certain nutrients for carbon, electrons, or energy that other competitors can't use or to provide growth conditions that members of these groups prefer or can tolerate that other competitors don't like. You can learn a lot about the unique properties of your cultured bacteria but don't forget to think about how those capabilities complement those of other bacteria found in your habitat. We are particularly interested in potential symbioses or how competitors in the soil carve out a niche and thrive. <BR><BR>		'''Begin to finalize the characterization of your culturable isolates and start to analyze your data''' in an attempt to organize your thinking about our experimental question: What bacteria comprise the soil community in the particular habitat I am investigating and, more importantly, what are the functional and phylogenetic relationships among those bacteria that I have studied directly or that I know are there from our culture independent sequencing? We have investigated directly in your roles tests (starch digestion, antibiotic production and sensitivity, cellulose digestion, ammonification, carbohydrate and other nutrient breakdown pathways, etc. ) and we have tested directly only a few of the thousands of enzymes these bacteria may possess. We have tried to find out some things about their structure, their ability to do self directed motility, and we have looked for capabilities involved in protecting themselves from adverse environmental conditions (capsules, endospores) or from competition (antibiotic production). Don't forget to analyze the enrichment media we used. The idea of "selecting" particular bacterial group on special enrichment media is based on the ability of members of these groups to use certain nutrients for carbon, electrons, or energy that other competitors can't use or to provide growth conditions that members of these groups prefer or can tolerate that other competitors don't like. You can learn a lot about the unique properties of your cultured bacteria but don't forget to think about how those capabilities complement those of other bacteria found in your habitat. We are particularly interested in potential symbioses or how competitors in the soil carve out a niche and thrive. <BR><BR>

Tucker Crum: /* Assignment */

2010-03-11T16:02:15Z

Assignment

←Older revision		Revision as of 16:02, 11 March 2010
Line 56:		Line 56:
	==Assignment==		==Assignment==
	Study for your '''Lab Practical'''. <BR><BR>		Study for your '''Lab Practical'''. <BR><BR>
-	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you read yellow or blue color production in certain regions or tubes of the OF/Glucose test to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learned from that test whether or not that isolate could catabolize peptone. What the practical will assess is not that you know how to perform the test or that you are looking for a yellow or blue color change, but that you understand how to evaluate the results in terms of metabolic capabilities (such as my description of glucose and peptone catabolism). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch? Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ~~are also~~ practical material. Your homework assignment for last week should be a good study guide for that material.	+	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you read yellow or blue color production in certain regions or tubes of the OF/Glucose test to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learned from that test whether or not that isolate could catabolize peptone. What the practical will assess is not that you know how to perform the test or that you are looking for a yellow or blue color change, but that you understand how to evaluate the results in terms of metabolic capabilities (such as my description of glucose and peptone catabolism). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch? <BR><BR>
		+
		+	Wondering how to study? A lot of what we will evaluate you on, you already know how to do in your sleep, such as streaking for isolation using proper technique. You do not have to memorize the procedures in the wiki. You will have access to the lab manuals during the practical to review procedures so you can follow those directions. You should study the information in the Protocols section of the wiki (including the background information) for all the work that you performed. The protocols in the wiki describing tests that you have not done (like Enterotubes) are NOT included in the practical. However, even if you didn't do or get a positive endospore or capsule stain, you should know how to evaluate those stains and recognize a positive. We will have a positive endospore and capsule stain on demo slides out in the lab next to a microscope for you to come in and review, if you wish.
		+
		+	Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene ARE practical material. Your homework assignment for last week should be a good study guide for that material as is all of the background information in the wiki in LABS 1-6 and in the general information page for our project in the main menu.<BR><BR>
		+
		+

Tucker Crum: /* Assignment */

2010-03-11T15:52:07Z

Assignment

←Older revision		Revision as of 15:52, 11 March 2010
Line 56:		Line 56:
	==Assignment==		==Assignment==
	Study for your '''Lab Practical'''. <BR><BR>		Study for your '''Lab Practical'''. <BR><BR>
-	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you read yellow or blue color production in certain regions or tubes of the OF/Glucose test to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learned from that test whether or not that isolate could catabolize peptone. What the practical will assess is not that you know how to perform the test but that you understand how to evaluate the results in terms of metabolic capabilities. We might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch?	+	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you read yellow or blue color production in certain regions or tubes of the OF/Glucose test to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learned from that test whether or not that isolate could catabolize peptone. What the practical will assess is not that you know how to perform the test or that you are looking for a yellow or blue color change, but that you understand how to evaluate the results in terms of metabolic capabilities (such as my description of glucose and peptone catabolism). Another example: we might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch? Don't forget that understanding of the molecular tools we used for culture independent 16srRNA analysis and what we can learn from sequencing this gene are also practical material. Your homework assignment for last week should be a good study guide for that material.

Tucker Crum: /* Assignment */

2010-03-11T14:50:23Z

Assignment

←Older revision		Revision as of 14:50, 11 March 2010
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	==Assignment==		==Assignment==
-	Study for your Lab Practical. <BR><BR>	+	Study for your '''Lab Practical'''. <BR><BR>
		+	In Lab 8 you will have a LAB PRACTICAL, an exam that tests your ability to function as a microbiologist in the lab. There will be two main categories of assessment: testing practical skills such as your ability to perform crucial techniques (aseptic transfer, streaking for isolation, performing a Gram stain, micropipetting, etc.) and testing for your understanding of the biological basis behind the work that you've done this semester. For example, you read yellow or blue color production in certain regions or tubes of the OF/Glucose test to distinguish facultative fermentors of glucose from bacteria that have only an aerobic pathway for catabolism of glucose or no way to break down that nutrient; you also learned from that test whether or not that isolate could catabolize peptone. What the practical will assess is not that you know how to perform the test but that you understand how to evaluate the results in terms of metabolic capabilities. We might give you a starch plate flooded with iodine and ask you which, if any, of the bacteria forming colonies on this plate are capable of digesting starch?
		+
		+
	'''Begin to finalize the characterization of your culturable isolates and start to analyze your data''' in an attempt to organize your thinking about our experimental question: What bacteria comprise the soil community in the particular habitat I am investigating and, more importantly, what are the functional and phylogenetic relationships among those bacteria that I have studied directly or that I know are there from our culture independent sequencing? We have investigated directly in your roles tests (starch digestion, antibiotic production and sensitivity, cellulose digestion, ammonification, carbohydrate and other nutrient breakdown pathways, etc. ) and we have tested directly only a few of the thousands of enzymes these bacteria may possess. We have tried to find out some things about their structure, their ability to do self directed motility, and we have looked for capabilities involved in protecting themselves from adverse environmental conditions (capsules, endospores) or from competition (antibiotic production). Don't forget to analyze the enrichment media we used. The idea of "selecting" particular bacterial group on special enrichment media is based on the ability of members of these groups to use certain nutrients for carbon, electrons, or energy that other competitors can't use or to provide growth conditions that members of these groups prefer or can tolerate that other competitors don't like. You can learn a lot about the unique properties of your cultured bacteria but don't forget to think about how those capabilities complement those of other bacteria found in your habitat. We are particularly interested in potential symbioses or how competitors in the soil carve out a niche and thrive. <BR><BR>		'''Begin to finalize the characterization of your culturable isolates and start to analyze your data''' in an attempt to organize your thinking about our experimental question: What bacteria comprise the soil community in the particular habitat I am investigating and, more importantly, what are the functional and phylogenetic relationships among those bacteria that I have studied directly or that I know are there from our culture independent sequencing? We have investigated directly in your roles tests (starch digestion, antibiotic production and sensitivity, cellulose digestion, ammonification, carbohydrate and other nutrient breakdown pathways, etc. ) and we have tested directly only a few of the thousands of enzymes these bacteria may possess. We have tried to find out some things about their structure, their ability to do self directed motility, and we have looked for capabilities involved in protecting themselves from adverse environmental conditions (capsules, endospores) or from competition (antibiotic production). Don't forget to analyze the enrichment media we used. The idea of "selecting" particular bacterial group on special enrichment media is based on the ability of members of these groups to use certain nutrients for carbon, electrons, or energy that other competitors can't use or to provide growth conditions that members of these groups prefer or can tolerate that other competitors don't like. You can learn a lot about the unique properties of your cultured bacteria but don't forget to think about how those capabilities complement those of other bacteria found in your habitat. We are particularly interested in potential symbioses or how competitors in the soil carve out a niche and thrive. <BR><BR>

Tucker Crum: /* Assignment */

2010-03-11T14:32:43Z

Assignment

←Older revision		Revision as of 14:32, 11 March 2010
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	==Assignment==		==Assignment==
	Study for your Lab Practical. <BR><BR>		Study for your Lab Practical. <BR><BR>
-	Begin to finalize the characterization of your culturable isolates and start to analyze your data in an attempt to organize your thinking about our experimental question: What bacteria comprise the soil community in the particular habitat I am investigating and, more importantly, what are the functional and phylogenetic relationships among those bacteria that I have studied directly or that I know are there from our culture independent sequencing? We have investigated directly in your roles tests (starch digestion, antibiotic production and sensitivity, cellulose digestion, ammonification, carbohydrate and other nutrient breakdown pathways, etc. ) and we have tested directly only a few of the thousands of enzymes these bacteria may possess. We have tried to find out some things about their structure, their ability to do self directed motility, and we have looked for capabilities involved in protecting themselves from adverse environmental conditions (capsules, endospores) or from competition (antibiotic production). Don't forget to analyze the enrichment media we used. The idea of "selecting" particular bacterial group on special enrichment media is based on the ability of members of these groups to use certain nutrients for carbon, electrons, or energy that other competitors can't use or to provide growth conditions that members of these groups prefer or can tolerate that other competitors don't like. You can learn a lot about the unique properties of your cultured bacteria but don't forget to think about how those capabilities complement those of other bacteria found in your habitat. We are particularly interested in potential symbioses or how competitors in the soil carve out a niche and thrive. <BR><BR>	+	'''Begin to finalize the characterization of your culturable isolates and start to analyze your data''' in an attempt to organize your thinking about our experimental question: What bacteria comprise the soil community in the particular habitat I am investigating and, more importantly, what are the functional and phylogenetic relationships among those bacteria that I have studied directly or that I know are there from our culture independent sequencing? We have investigated directly in your roles tests (starch digestion, antibiotic production and sensitivity, cellulose digestion, ammonification, carbohydrate and other nutrient breakdown pathways, etc. ) and we have tested directly only a few of the thousands of enzymes these bacteria may possess. We have tried to find out some things about their structure, their ability to do self directed motility, and we have looked for capabilities involved in protecting themselves from adverse environmental conditions (capsules, endospores) or from competition (antibiotic production). Don't forget to analyze the enrichment media we used. The idea of "selecting" particular bacterial group on special enrichment media is based on the ability of members of these groups to use certain nutrients for carbon, electrons, or energy that other competitors can't use or to provide growth conditions that members of these groups prefer or can tolerate that other competitors don't like. You can learn a lot about the unique properties of your cultured bacteria but don't forget to think about how those capabilities complement those of other bacteria found in your habitat. We are particularly interested in potential symbioses or how competitors in the soil carve out a niche and thrive. <BR><BR>

	You should not expect to get complete answers to our questions from your data, but you should get more than enough information to be able to propose from the evidence you have gathered some interesting functional roles and relationships amoung the bacteria you have identified and characterized.		You should not expect to get complete answers to our questions from your data, but you should get more than enough information to be able to propose from the evidence you have gathered some interesting functional roles and relationships amoung the bacteria you have identified and characterized.