1. The document discusses the pathogenesis and disease cycle of plant pathogens, including the stages of inoculation, penetration, infection, invasion, reproduction, dissemination, and overwintering.
2. It describes the differences between biotrophs, necrotrophs, and parasites, and explains how various pathogens such as fungi, bacteria, nematodes, and viruses penetrate hosts and infect plant tissues.
3. The document provides details on the local and systemic invasion of pathogens, how they reproduce and spread within the host, and are subsequently disseminated through various means such as wind, water, insects, and human activities.
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major pathogens include fungi, bacteria, viruses, and nematodes. The development of plant disease requires the simultaneous presence of a susceptible host, viable pathogen, and favorable environmental conditions, known as the disease triangle. Understanding the differences between disease symptoms visible on plants and physical signs of the pathogen helps with plant disease identification.
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major plant pathogens include fungi, bacteria, viruses, and nematodes. A disease cycle involves the pathogen surviving between seasons, dispersing to a susceptible host, infecting the host if environmental conditions are favorable, and producing inoculum to infect new hosts or survive until the next season. Understanding the disease cycle is important for identifying and managing plant diseases.
05 Introduction to Plant Pathology_0.pdftejendrakar76
Pathology is the study of disease and injury. It involves the examination of organs, tissues, and whole bodies to diagnose diseases. This field is divided into subdisciplines, with anatomical pathology being concerned with the diagnosis of disease based on the gross
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major plant pathogens include fungi, bacteria, viruses, and nematodes. A disease cycle involves the pathogen surviving between seasons, dispersing to a susceptible host, infecting the host if environmental conditions are favorable, and producing inoculum to infect new hosts or survive until the next season. Understanding the disease cycle is important for identifying and managing plant diseases.
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major plant pathogens include fungi, bacteria, viruses, and nematodes. A disease cycle involves the pathogen surviving between seasons, dispersing to a susceptible host, infecting the host if environmental conditions are favorable, and producing inoculum to infect new hosts or survive until the next season. Understanding the disease cycle is important for identifying and managing plant diseases.
This document discusses plant diseases. It defines a plant disease as any abnormal condition that affects a plant's appearance or function. Visible effects are called symptoms, while physical evidence of pathogens are signs. Plant diseases are caused by living organisms like fungi, bacteria, viruses, and nematodes. For a disease to develop, the pathogen must interact with a susceptible host in a favorable environment, known as the disease triangle. The disease cycle describes the process of a pathogen surviving, spreading, infecting a host, and reproducing. Understanding the disease cycle is key to identifying and managing plant diseases.
The document summarizes the infection process of pathogens in plants. It describes the three phases of infection as pre-entry, entry, and colonization. In pre-entry, spores must germinate and find entry points like stomata or wounds. During entry, pathogens use specialized structures or enzymes to penetrate the plant surface. In colonization, pathogens establish relationships as biotrophs, necrotrophs, or hemibiotrophs and infect tissues, altering plant physiology through impacts on processes like respiration, photosynthesis, and nutrient transport.
The document summarizes the infection process of pathogens in plants. It describes the three phases of infection as pre-entry, entry, and colonization. Pre-entry involves spore germination and finding a host. Entry can occur through natural openings like stomata or wounds. Colonization establishes a parasitic relationship, with some pathogens living among living cells and others killing cells first. Successful infection requires a pathogen gaining entry and colonizing the host.
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major pathogens include fungi, bacteria, viruses, and nematodes. The development of plant disease requires the simultaneous presence of a susceptible host, viable pathogen, and favorable environmental conditions, known as the disease triangle. Understanding the differences between disease symptoms visible on plants and physical signs of the pathogen helps with plant disease identification.
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major plant pathogens include fungi, bacteria, viruses, and nematodes. A disease cycle involves the pathogen surviving between seasons, dispersing to a susceptible host, infecting the host if environmental conditions are favorable, and producing inoculum to infect new hosts or survive until the next season. Understanding the disease cycle is important for identifying and managing plant diseases.
05 Introduction to Plant Pathology_0.pdftejendrakar76
Pathology is the study of disease and injury. It involves the examination of organs, tissues, and whole bodies to diagnose diseases. This field is divided into subdisciplines, with anatomical pathology being concerned with the diagnosis of disease based on the gross
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major plant pathogens include fungi, bacteria, viruses, and nematodes. A disease cycle involves the pathogen surviving between seasons, dispersing to a susceptible host, infecting the host if environmental conditions are favorable, and producing inoculum to infect new hosts or survive until the next season. Understanding the disease cycle is important for identifying and managing plant diseases.
Plant diseases are caused by living pathogens that infect plants and obtain nutrition from them. Major plant pathogens include fungi, bacteria, viruses, and nematodes. A disease cycle involves the pathogen surviving between seasons, dispersing to a susceptible host, infecting the host if environmental conditions are favorable, and producing inoculum to infect new hosts or survive until the next season. Understanding the disease cycle is important for identifying and managing plant diseases.
This document discusses plant diseases. It defines a plant disease as any abnormal condition that affects a plant's appearance or function. Visible effects are called symptoms, while physical evidence of pathogens are signs. Plant diseases are caused by living organisms like fungi, bacteria, viruses, and nematodes. For a disease to develop, the pathogen must interact with a susceptible host in a favorable environment, known as the disease triangle. The disease cycle describes the process of a pathogen surviving, spreading, infecting a host, and reproducing. Understanding the disease cycle is key to identifying and managing plant diseases.
The document summarizes the infection process of pathogens in plants. It describes the three phases of infection as pre-entry, entry, and colonization. In pre-entry, spores must germinate and find entry points like stomata or wounds. During entry, pathogens use specialized structures or enzymes to penetrate the plant surface. In colonization, pathogens establish relationships as biotrophs, necrotrophs, or hemibiotrophs and infect tissues, altering plant physiology through impacts on processes like respiration, photosynthesis, and nutrient transport.
The document summarizes the infection process of pathogens in plants. It describes the three phases of infection as pre-entry, entry, and colonization. Pre-entry involves spore germination and finding a host. Entry can occur through natural openings like stomata or wounds. Colonization establishes a parasitic relationship, with some pathogens living among living cells and others killing cells first. Successful infection requires a pathogen gaining entry and colonizing the host.
This document provides an introduction to plant pathology. It defines a plant disease and explains that diseases are caused by living pathogens including fungi, bacteria, viruses, and nematodes interacting with a susceptible host plant under favorable environmental conditions. The disease cycle is described as the progression of a pathogen from its inoculum source to infecting a host, spreading within the host, and surviving to infect future hosts. Key phases include inoculum production, spread to the host, penetration and infection of the host, and pathogen survival between growing seasons.
- A plant disease develops when a pathogen attacks a plant under favorable environmental conditions. The development of disease is represented by the disease triangle, with the three components being the host plant, pathogen, and environment.
- For a disease to occur, all three components of the disease triangle must be present. The length of each side represents how conducive each component is to disease development.
- The disease cycle refers to the series of events like infection, colonization, reproduction, and survival that allow a pathogen to perpetuate disease over time on or within a host. It spans a growing season or between seasons.
B.sc agriculture i principles of plant pathology u 1.3 introduction to plant ...Rai University
The infection process of plant pathogens can be divided into three phases: pre-entry, entry, and colonization. In pre-entry, a spore must germinate and find the host. Entry involves the pathogen penetrating the plant surface directly or through openings. Colonization establishes a parasitic relationship where the pathogen feeds within host tissues as either a biotroph, necrotroph, or hemibiotroph. Successful infection depends on the pathogen, host, and environment, and disrupts various plant processes.
Characteristics of pet/virus , plant disease , pest life cycle, regarding and repeating plant disease , selecting treatment methods, Control plant pest / virus .
This document provides information about bacterial infections in plants. It discusses how bacteria infect plants, including entering through natural openings or wounds. It describes different types of bacterial diseases like blight, cankers, and black rot and their associated symptoms. The mechanisms of pathogenic bacteria are also summarized, such as producing enzymes that damage plant cell walls or toxins that cause disease symptoms.
This document provides information about bacterial infections in plants. It discusses how bacteria infect plants, including entering through natural openings or wounds. It describes different types of bacterial diseases like blight, cankers, and black rot and their associated symptoms. The mechanisms of pathogenic bacteria are also summarized, such as producing enzymes that damage plant cell walls or toxins that cause disease symptoms.
The document discusses the pathogenesis or disease cycle of plant pathogens. It involves a chain of events including inoculation, penetration, infection, invasion, colonization, growth and reproduction of the pathogen, and dissemination. Pathogens can survive between growing seasons through various structures like mycelium, sclerotia, or infected plant debris. The disease cycle can be continuous, with the pathogen actively infecting hosts, or intermittent, with the pathogen surviving dormant or as a saprophyte.
This document provides an overview of plant pathology and the factors that influence plant disease development. It discusses the components of plant disease including pathogens, hosts, and the environment. Various types of pathogens are described such as fungi, bacteria, viruses, nematodes and their disease cycles. The document outlines environmental factors like moisture and temperature that affect disease buildup. It also discusses strategies for managing plant diseases, including cultural practices like sanitation, crop rotation and temperature management as well as chemical controls and host plant resistance.
Plant pathology is the study of plant diseases and their causes. Diseases can be caused by abiotic factors like temperature stress or biotic factors like fungi, bacteria, viruses, nematodes and parasitic plants. The disease triangle shows that a susceptible host, viable pathogen and favorable environment are necessary for disease development. Fungal, bacterial and viral pathogens can enter plants and disrupt physiological processes through various mechanisms. Plants have structural and chemical defenses to resist pathogens. Proper diagnosis of plant diseases involves examining symptoms and signs to identify the pathogen. Integrated disease management utilizes prevention strategies and controls when needed.
This document discusses infection control concepts, including the cycle of infection and how microorganisms like bacteria, viruses, fungi and protozoa can be transmitted. It explains that hospitals are sites for disease transmission due to gathering sick patients. Proper infection control practices like following established policies are important for healthcare worker and patient safety. Microorganisms can be transmitted through direct or indirect contact via fomites, vectors, vehicles, droplets or airborne routes. The body has natural and acquired defenses against infections that can be supported by vaccines and immunoglobulins.
Plant Pathology is the study of diseases that affect plants. It involves studying the causes, mechanisms, and control of plant diseases. The document discusses key topics in plant pathology including disease cycles, types of pathogens and inoculum, modes of dissemination, and the relationship between disease cycles and epidemics. It provides definitions and examples of important terminology used in plant pathology.
This document discusses the dissemination and transmission of viruses in plants and humans. It explains that viruses spread from infected to uninfected hosts through various modes of transmission. In plants, viruses can be transmitted mechanically, through grafting, pollen, seeds, nematodes, fungi, insects, and dodder. Important insect vectors that transmit plant viruses include aphids, leafhoppers, grasshoppers, and beetles. The document provides examples of specific viruses and their modes of transmission in both plants and humans.
This document outlines the key stages in the pathogenesis or disease cycle of pathogens: inoculation, pre-penetration, penetration, and post-penetration. Inoculation involves the pathogen coming into contact with the host via inoculum such as spores or mycelium. Pre-penetration includes spore germination, attachment, and recognition between the pathogen and plant. Penetration can occur through natural openings like stomata or directly through the plant surface. Post-penetration consists of infection, invasion, and reproduction of the pathogen within the host leading to symptoms, colonization, and survival or dissemination of the pathogen.
This document discusses the pathogenesis of plant pathogens. It covers several key points:
1. It defines parasitism and symbiosis, and explains that pathogens cause pathogenesis which is harmful to the host.
2. There are different levels of parasitism, ranging from symbiotic relationships that benefit both organisms to obligate parasites that cannot live without their host.
3. Pathogenesis is the ability of the pathogen to interfere with the host's essential functions. There are several stages of pathogenesis, including pre-penetration, penetration, and post-penetration processes.
4. The document goes into detail about the specific processes involved at each stage, such as spore germination, attachment to the host
B.sc agriculture i principles of plant pathology u 1.1 introduction to plant ...Rai University
This document provides an introduction to the principles of plant pathology. It defines plant pathology as the study of diseases that affect plants. It discusses the importance of plant diseases throughout history, including potato late blight that caused the Irish potato famine. It describes the key postulates for identifying causal agents of plant diseases. It also defines infectious and non-infectious diseases and provides examples of each. The major types of pathogens that cause infectious diseases are described, including fungi, bacteria, nematodes and viruses.
This document provides an overview of plant pathology and the factors involved in plant disease development. It discusses the main types of plant pathogens including fungi, bacteria, viruses, nematodes and environmental factors. It describes how pathogens infect plants and cause disease symptoms. It also summarizes strategies for managing plant diseases, such as sanitation, fungicides, host plant resistance, crop rotation, cultural practices, temperature control, and biological control. The overall document provides a comprehensive introduction to the concepts of plant pathology.
Here are the answers to the questions:
1. The infectious agent could be multidrug-resistant organisms (MDROs) like C. difficile, MRSA, VRE present in the stool of the first patient.
2. The second patient could develop a urinary tract infection (UTI) since their hands were not washed before assisting with the Foley catheter.
3. Antibiotics that could be used include vancomycin, linezolid, daptomycin for MRSA or VRE. For C. difficile, metronidazole or oral vancomycin could be used.
4. The gastrointestinal tract of the first patient is the source/reserv
Term and Definitions regarding microbiology, Pathogenicity and virulency, acute and chronic infection, primary and secondary infection, opportunistic infection.
Improving the viability of probiotics by encapsulation methods for developmen...Open Access Research Paper
The popularity of functional foods among scientists and common people has been increasing day by day. Awareness and modernization make the consumer think better regarding food and nutrition. Now a day’s individual knows very well about the relation between food consumption and disease prevalence. Humans have a diversity of microbes in the gut that together form the gut microflora. Probiotics are the health-promoting live microbial cells improve host health through gut and brain connection and fighting against harmful bacteria. Bifidobacterium and Lactobacillus are the two bacterial genera which are considered to be probiotic. These good bacteria are facing challenges of viability. There are so many factors such as sensitivity to heat, pH, acidity, osmotic effect, mechanical shear, chemical components, freezing and storage time as well which affects the viability of probiotics in the dairy food matrix as well as in the gut. Multiple efforts have been done in the past and ongoing in present for these beneficial microbial population stability until their destination in the gut. One of a useful technique known as microencapsulation makes the probiotic effective in the diversified conditions and maintain these microbe’s community to the optimum level for achieving targeted benefits. Dairy products are found to be an ideal vehicle for probiotic incorporation. It has been seen that the encapsulated microbial cells show higher viability than the free cells in different processing and storage conditions as well as against bile salts in the gut. They make the food functional when incorporated, without affecting the product sensory characteristics.
This document provides an introduction to plant pathology. It defines a plant disease and explains that diseases are caused by living pathogens including fungi, bacteria, viruses, and nematodes interacting with a susceptible host plant under favorable environmental conditions. The disease cycle is described as the progression of a pathogen from its inoculum source to infecting a host, spreading within the host, and surviving to infect future hosts. Key phases include inoculum production, spread to the host, penetration and infection of the host, and pathogen survival between growing seasons.
- A plant disease develops when a pathogen attacks a plant under favorable environmental conditions. The development of disease is represented by the disease triangle, with the three components being the host plant, pathogen, and environment.
- For a disease to occur, all three components of the disease triangle must be present. The length of each side represents how conducive each component is to disease development.
- The disease cycle refers to the series of events like infection, colonization, reproduction, and survival that allow a pathogen to perpetuate disease over time on or within a host. It spans a growing season or between seasons.
B.sc agriculture i principles of plant pathology u 1.3 introduction to plant ...Rai University
The infection process of plant pathogens can be divided into three phases: pre-entry, entry, and colonization. In pre-entry, a spore must germinate and find the host. Entry involves the pathogen penetrating the plant surface directly or through openings. Colonization establishes a parasitic relationship where the pathogen feeds within host tissues as either a biotroph, necrotroph, or hemibiotroph. Successful infection depends on the pathogen, host, and environment, and disrupts various plant processes.
Characteristics of pet/virus , plant disease , pest life cycle, regarding and repeating plant disease , selecting treatment methods, Control plant pest / virus .
This document provides information about bacterial infections in plants. It discusses how bacteria infect plants, including entering through natural openings or wounds. It describes different types of bacterial diseases like blight, cankers, and black rot and their associated symptoms. The mechanisms of pathogenic bacteria are also summarized, such as producing enzymes that damage plant cell walls or toxins that cause disease symptoms.
This document provides information about bacterial infections in plants. It discusses how bacteria infect plants, including entering through natural openings or wounds. It describes different types of bacterial diseases like blight, cankers, and black rot and their associated symptoms. The mechanisms of pathogenic bacteria are also summarized, such as producing enzymes that damage plant cell walls or toxins that cause disease symptoms.
The document discusses the pathogenesis or disease cycle of plant pathogens. It involves a chain of events including inoculation, penetration, infection, invasion, colonization, growth and reproduction of the pathogen, and dissemination. Pathogens can survive between growing seasons through various structures like mycelium, sclerotia, or infected plant debris. The disease cycle can be continuous, with the pathogen actively infecting hosts, or intermittent, with the pathogen surviving dormant or as a saprophyte.
This document provides an overview of plant pathology and the factors that influence plant disease development. It discusses the components of plant disease including pathogens, hosts, and the environment. Various types of pathogens are described such as fungi, bacteria, viruses, nematodes and their disease cycles. The document outlines environmental factors like moisture and temperature that affect disease buildup. It also discusses strategies for managing plant diseases, including cultural practices like sanitation, crop rotation and temperature management as well as chemical controls and host plant resistance.
Plant pathology is the study of plant diseases and their causes. Diseases can be caused by abiotic factors like temperature stress or biotic factors like fungi, bacteria, viruses, nematodes and parasitic plants. The disease triangle shows that a susceptible host, viable pathogen and favorable environment are necessary for disease development. Fungal, bacterial and viral pathogens can enter plants and disrupt physiological processes through various mechanisms. Plants have structural and chemical defenses to resist pathogens. Proper diagnosis of plant diseases involves examining symptoms and signs to identify the pathogen. Integrated disease management utilizes prevention strategies and controls when needed.
This document discusses infection control concepts, including the cycle of infection and how microorganisms like bacteria, viruses, fungi and protozoa can be transmitted. It explains that hospitals are sites for disease transmission due to gathering sick patients. Proper infection control practices like following established policies are important for healthcare worker and patient safety. Microorganisms can be transmitted through direct or indirect contact via fomites, vectors, vehicles, droplets or airborne routes. The body has natural and acquired defenses against infections that can be supported by vaccines and immunoglobulins.
Plant Pathology is the study of diseases that affect plants. It involves studying the causes, mechanisms, and control of plant diseases. The document discusses key topics in plant pathology including disease cycles, types of pathogens and inoculum, modes of dissemination, and the relationship between disease cycles and epidemics. It provides definitions and examples of important terminology used in plant pathology.
This document discusses the dissemination and transmission of viruses in plants and humans. It explains that viruses spread from infected to uninfected hosts through various modes of transmission. In plants, viruses can be transmitted mechanically, through grafting, pollen, seeds, nematodes, fungi, insects, and dodder. Important insect vectors that transmit plant viruses include aphids, leafhoppers, grasshoppers, and beetles. The document provides examples of specific viruses and their modes of transmission in both plants and humans.
This document outlines the key stages in the pathogenesis or disease cycle of pathogens: inoculation, pre-penetration, penetration, and post-penetration. Inoculation involves the pathogen coming into contact with the host via inoculum such as spores or mycelium. Pre-penetration includes spore germination, attachment, and recognition between the pathogen and plant. Penetration can occur through natural openings like stomata or directly through the plant surface. Post-penetration consists of infection, invasion, and reproduction of the pathogen within the host leading to symptoms, colonization, and survival or dissemination of the pathogen.
This document discusses the pathogenesis of plant pathogens. It covers several key points:
1. It defines parasitism and symbiosis, and explains that pathogens cause pathogenesis which is harmful to the host.
2. There are different levels of parasitism, ranging from symbiotic relationships that benefit both organisms to obligate parasites that cannot live without their host.
3. Pathogenesis is the ability of the pathogen to interfere with the host's essential functions. There are several stages of pathogenesis, including pre-penetration, penetration, and post-penetration processes.
4. The document goes into detail about the specific processes involved at each stage, such as spore germination, attachment to the host
B.sc agriculture i principles of plant pathology u 1.1 introduction to plant ...Rai University
This document provides an introduction to the principles of plant pathology. It defines plant pathology as the study of diseases that affect plants. It discusses the importance of plant diseases throughout history, including potato late blight that caused the Irish potato famine. It describes the key postulates for identifying causal agents of plant diseases. It also defines infectious and non-infectious diseases and provides examples of each. The major types of pathogens that cause infectious diseases are described, including fungi, bacteria, nematodes and viruses.
This document provides an overview of plant pathology and the factors involved in plant disease development. It discusses the main types of plant pathogens including fungi, bacteria, viruses, nematodes and environmental factors. It describes how pathogens infect plants and cause disease symptoms. It also summarizes strategies for managing plant diseases, such as sanitation, fungicides, host plant resistance, crop rotation, cultural practices, temperature control, and biological control. The overall document provides a comprehensive introduction to the concepts of plant pathology.
Here are the answers to the questions:
1. The infectious agent could be multidrug-resistant organisms (MDROs) like C. difficile, MRSA, VRE present in the stool of the first patient.
2. The second patient could develop a urinary tract infection (UTI) since their hands were not washed before assisting with the Foley catheter.
3. Antibiotics that could be used include vancomycin, linezolid, daptomycin for MRSA or VRE. For C. difficile, metronidazole or oral vancomycin could be used.
4. The gastrointestinal tract of the first patient is the source/reserv
Term and Definitions regarding microbiology, Pathogenicity and virulency, acute and chronic infection, primary and secondary infection, opportunistic infection.
Improving the viability of probiotics by encapsulation methods for developmen...Open Access Research Paper
The popularity of functional foods among scientists and common people has been increasing day by day. Awareness and modernization make the consumer think better regarding food and nutrition. Now a day’s individual knows very well about the relation between food consumption and disease prevalence. Humans have a diversity of microbes in the gut that together form the gut microflora. Probiotics are the health-promoting live microbial cells improve host health through gut and brain connection and fighting against harmful bacteria. Bifidobacterium and Lactobacillus are the two bacterial genera which are considered to be probiotic. These good bacteria are facing challenges of viability. There are so many factors such as sensitivity to heat, pH, acidity, osmotic effect, mechanical shear, chemical components, freezing and storage time as well which affects the viability of probiotics in the dairy food matrix as well as in the gut. Multiple efforts have been done in the past and ongoing in present for these beneficial microbial population stability until their destination in the gut. One of a useful technique known as microencapsulation makes the probiotic effective in the diversified conditions and maintain these microbe’s community to the optimum level for achieving targeted benefits. Dairy products are found to be an ideal vehicle for probiotic incorporation. It has been seen that the encapsulated microbial cells show higher viability than the free cells in different processing and storage conditions as well as against bile salts in the gut. They make the food functional when incorporated, without affecting the product sensory characteristics.
ENVIRONMENT~ Renewable Energy Sources and their future prospects.tiwarimanvi3129
This presentation is for us to know that how our Environment need Attention for protection of our natural resources which are depleted day by day that's why we need to take time and shift our attention to renewable energy sources instead of non-renewable sources which are better and Eco-friendly for our environment. these renewable energy sources are so helpful for our planet and for every living organism which depends on environment.
Kinetic studies on malachite green dye adsorption from aqueous solutions by A...Open Access Research Paper
Water polluted by dyestuffs compounds is a global threat to health and the environment; accordingly, we prepared a green novel sorbent chemical and Physical system from an algae, chitosan and chitosan nanoparticle and impregnated with algae with chitosan nanocomposite for the sorption of Malachite green dye from water. The algae with chitosan nanocomposite by a simple method and used as a recyclable and effective adsorbent for the removal of malachite green dye from aqueous solutions. Algae, chitosan, chitosan nanoparticle and algae with chitosan nanocomposite were characterized using different physicochemical methods. The functional groups and chemical compounds found in algae, chitosan, chitosan algae, chitosan nanoparticle, and chitosan nanoparticle with algae were identified using FTIR, SEM, and TGADTA/DTG techniques. The optimal adsorption conditions, different dosages, pH and Temperature the amount of algae with chitosan nanocomposite were determined. At optimized conditions and the batch equilibrium studies more than 99% of the dye was removed. The adsorption process data matched well kinetics showed that the reaction order for dye varied with pseudo-first order and pseudo-second order. Furthermore, the maximum adsorption capacity of the algae with chitosan nanocomposite toward malachite green dye reached as high as 15.5mg/g, respectively. Finally, multiple times reusing of algae with chitosan nanocomposite and removing dye from a real wastewater has made it a promising and attractive option for further practical applications.
Climate Change All over the World .pptxsairaanwer024
Climate change refers to significant and lasting changes in the average weather patterns over periods ranging from decades to millions of years. It encompasses both global warming driven by human emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. While climate change is a natural phenomenon, human activities, particularly since the Industrial Revolution, have accelerated its pace and intensity
Epcon is One of the World's leading Manufacturing Companies.EpconLP
Epcon is One of the World's leading Manufacturing Companies. With over 4000 installations worldwide, EPCON has been pioneering new techniques since 1977 that have become industry standards now. Founded in 1977, Epcon has grown from a one-man operation to a global leader in developing and manufacturing innovative air pollution control technology and industrial heating equipment.
Microbial characterisation and identification, and potability of River Kuywa ...Open Access Research Paper
Water contamination is one of the major causes of water borne diseases worldwide. In Kenya, approximately 43% of people lack access to potable water due to human contamination. River Kuywa water is currently experiencing contamination due to human activities. Its water is widely used for domestic, agricultural, industrial and recreational purposes. This study aimed at characterizing bacteria and fungi in river Kuywa water. Water samples were randomly collected from four sites of the river: site A (Matisi), site B (Ngwelo), site C (Nzoia water pump) and site D (Chalicha), during the dry season (January-March 2018) and wet season (April-July 2018) and were transported to Maseno University Microbiology and plant pathology laboratory for analysis. The characterization and identification of bacteria and fungi were carried out using standard microbiological techniques. Nine bacterial genera and three fungi were identified from Kuywa river water. Clostridium spp., Staphylococcus spp., Enterobacter spp., Streptococcus spp., E. coli, Klebsiella spp., Shigella spp., Proteus spp. and Salmonella spp. Fungi were Fusarium oxysporum, Aspergillus flavus complex and Penicillium species. Wet season recorded highest bacterial and fungal counts (6.61-7.66 and 3.83-6.75cfu/ml) respectively. The results indicated that the river Kuywa water is polluted and therefore unsafe for human consumption before treatment. It is therefore recommended that the communities to ensure that they boil water especially for drinking.
Evolving Lifecycles with High Resolution Site Characterization (HRSC) and 3-D...Joshua Orris
The incorporation of a 3DCSM and completion of HRSC provided a tool for enhanced, data-driven, decisions to support a change in remediation closure strategies. Currently, an approved pilot study has been obtained to shut-down the remediation systems (ISCO, P&T) and conduct a hydraulic study under non-pumping conditions. A separate micro-biological bench scale treatability study was competed that yielded positive results for an emerging innovative technology. As a result, a field pilot study has commenced with results expected in nine-twelve months. With the results of the hydraulic study, field pilot studies and an updated risk assessment leading site monitoring optimization cost lifecycle savings upwards of $15MM towards an alternatively evolved best available technology remediation closure strategy.
Optimizing Post Remediation Groundwater Performance with Enhanced Microbiolog...Joshua Orris
Results of geophysics and pneumatic injection pilot tests during 2003 – 2007 yielded significant positive results for injection delivery design and contaminant mass treatment, resulting in permanent shut-down of an existing groundwater Pump & Treat system.
Accessible source areas were subsequently removed (2011) by soil excavation and treated with the placement of Emulsified Vegetable Oil EVO and zero-valent iron ZVI to accelerate treatment of impacted groundwater in overburden and weathered fractured bedrock. Post pilot test and post remediation groundwater monitoring has included analyses of CVOCs, organic fatty acids, dissolved gases and QuantArray® -Chlor to quantify key microorganisms (e.g., Dehalococcoides, Dehalobacter, etc.) and functional genes (e.g., vinyl chloride reductase, methane monooxygenase, etc.) to assess potential for reductive dechlorination and aerobic cometabolism of CVOCs.
In 2022, the first commercial application of MetaArray™ was performed at the site. MetaArray™ utilizes statistical analysis, such as principal component analysis and multivariate analysis to provide evidence that reductive dechlorination is active or even that it is slowing. This creates actionable data allowing users to save money by making important site management decisions earlier.
The results of the MetaArray™ analysis’ support vector machine (SVM) identified groundwater monitoring wells with a 80% confidence that were characterized as either Limited for Reductive Decholorination or had a High Reductive Reduction Dechlorination potential. The results of MetaArray™ will be used to further optimize the site’s post remediation monitoring program for monitored natural attenuation.
Presented by The Global Peatlands Assessment: Mapping, Policy, and Action at GLF Peatlands 2024 - The Global Peatlands Assessment: Mapping, Policy, and Action
Recycling and Disposal on SWM Raymond Einyu pptxRayLetai1
Increasing urbanization, rural–urban migration, rising standards of living, and rapid development associated with population growth have resulted in increased solid waste generation by industrial, domestic and other activities in Nairobi City. It has been noted in other contexts too that increasing population, changing consumption patterns, economic development, changing income, urbanization and industrialization all contribute to the increased generation of waste.
With the increasing urban population in Kenya, which is estimated to be growing at a rate higher than that of the country’s general population, waste generation and management is already a major challenge. The industrialization and urbanization process in the country, dominated by one major city – Nairobi, which has around four times the population of the next largest urban centre (Mombasa) – has witnessed an exponential increase in the generation of solid waste. It is projected that by 2030, about 50 per cent of the Kenyan population will be urban.
Aim:
A healthy, safe, secure and sustainable solid waste management system fit for a world – class city.
Improve and protect the public health of Nairobi residents and visitors.
Ecological health, diversity and productivity and maximize resource recovery through the participatory approach.
Goals:
Build awareness and capacity for source separation as essential components of sustainable waste management.
Build new environmentally sound infrastructure and systems for safe disposal of residual waste and replacing current dumpsites which should be commissioned.
Current solid waste management situation:
The status.
Solid waste generation rate is at 2240 tones / day
collection efficiently is at about 50%.
Actors i.e. city authorities, CBO’s , private firms and self-disposal
Current SWM Situation in Nairobi City:
Solid waste generation – collection – dumping
Good Practices:
• Separation – recycling – marketing.
• Open dumpsite dandora dump site through public education on source separation of waste, of which the situation can be reversed.
• Nairobi is one of the C40 cities in this respect , various actors in the solid waste management space have adopted a variety of technologies to reduce short lived climate pollutants including source separation , recycling , marketing of the recycled products.
• Through the network, it should expect to benefit from expertise of the different actors in the network in terms of applicable technologies and practices in reducing the short-lived climate pollutants.
Good practices:
Despite the dismal collection of solid waste in Nairobi city, there are practices and activities of informal actors (CBOs, CBO-SACCOs and yard shop operators) and other formal industrial actors on solid waste collection, recycling and waste reduction.
Practices and activities of these actor groups are viewed as innovations with the potential to change the way solid waste is handled.
CHALLENGES:
• Resource Allocation.
2. Intended Learning Outcomes
• Differentiate parasitism and pathogenicity
• State sequential events in disease
development
3. • Parasite: An organism that lives on and derives food from an
other organism
• Parasitism: The relationship between a parasite and its host is
parasitism
• Pathogen: An agent that can incite a disease.
• Pathogenicity is the ability of the pathogen to cause disease
10. Characteristics of Necrotrophs
Biochemical and morphological
features:
Host cell rapidly killed
Toxins and cytolytic enzyme produced
No special parasitic structures formed
Host penetration via wounds or natural
openings
11. Ecological features
• Wide host range
• Able to grow saprophytically away from the host
• Attack juvenile, debilitated or senescing tissues
Characteristics of Necrotrophs
12. Biochemical and morphological features:
• Host cells not rapidly killed
• Few or no toxins or cytolytic enzymes
produced
• Special parasitic structures eg, haustoria are
formed
• Host penetration direct or via natural openings
Characteristics of Biotrophs
13. Ecological features
• Narrow host range
• Unable to grow away from the host
• Attack healthy hosts at all stages of
development
Characteristics of Biotrophs
14. Pathogenesis/Disease cycle
The chain of events involved in disease
development, including the stages of
development of the pathogen and the effect of
disease on the host is called disease cycle or
pathogenesis
15.
16. Stages in the development of disease
Inoculation
Pre-penetration Phenomena
Penetration
Infection
Invasion
Growth and Reproduction of the Pathogen
Dissemination of the Pathogen
Over-wintering/over-summering of the Pathogen
22. Arrival or landing of inoculum on host
• Most is carried by wind, water, insects
• Only a small number actually lands on
susceptible plants
• Vector
24. Attachment of Pathogens to Host
• Viruses, mollicutes, fastidious bacteria, and
protozoa
• Almost all fungi, bacteria and parasitic plants
25. Attachment of Pathogens to Host
The propagules have mucilaginous
The germ tubes also produce these
substances
The areas of contact appears to degrade
presumably due to enzymes
26. Germination of spores and seeds
–Requirements for germination
1. Favorable temperature
2. Favorable moisture in the form of rain,
dew, or a film of water
27. Pre-penetration Phenomena
• Germination of spores and seeds
–Spore germination is often favored by
Exudates
Certain pathogens are only stimulated by
exudates of plants susceptible to that particular
pathogen
28. Pre-penetration Phenomena
Germination of spores and seeds
• Spore germination may be inhibited by
1. materials released by the plant
2. by saprophytic microflora
31. Pre-penetration Phenomena
• After spores germinate
• the resulting germ tubes must grow or
the secondary zoospores must move toward a
penetration site
• The number, length and rate of growth of germ
tubes or the number and mobility of motile
spores affected by temperature and moisture
Pre-penetration Phenomena
32. Prepenetration Phenomena
• Chemical stimuli associated with
wounds, stomata and lenticels also
stimulate growth
• Seeds germinate by producing a radicle
Pre-penetration Phenomena
33. Hatching of Nematode Eggs
• Favorable temperature and moisture
• The egg contains the first juvenile stage before or
soon after the egg is laid.
• This juvenile immediately undergoes a molt and
gives rise to the second juvenile stage, which may
remain dormant in the egg for various periods of
time.
34. Hatching of Nematode Eggs
• Thus, when the egg finally hatches, it is
the second-stage juvenile that emerges,
and it either finds and penetrates a host
plant or undergoes additional molts that
produce further juvenile stages and
adults.
35. Hatching of Nematode Eggs
• They are attracted to the root by CO2 and
some amino acids associated with root
growth
36. Penetration
• Pathogens penetrate plant surfaces through
natural openings or wounds or directly
• Some fungi penetrate only in one way others,
in several ways
• Bacteria enter mostly through wounds
sometimes through natural openings but never
directly
• Viruses, viroids, mollicutes fastidious bacteria
and protozoa enter through wounds by vectors
37.
38.
39. Direct penetration through intact plant
surfaces
• fungi and nematodes and parasitic plants
• Fungi use a fine hyphae
40. Direct penetration through intact plant
surfaces
• The penetration is through mechanical force and
softening of the cell walls by an enzyme
• Most fungi form an appressorium at the end of the
germ tube
• Then a penetration peg emerges from the flat
surface of the appressorium and pierces the
cuticle and cell wall
41. Direct penetration through intact plant
surfaces
• The peg grows into a fine hyphae then
reaches a normal diameter once it is
inside the cell
• Parasitic plants also penetrate the same
way
42. Direct penetration through intact plant
surfaces
• Nematodes penetrate its stylet
• inserts its stylet or the entire nematode enters
43. Penetration through wounds
• Bacteria, most fungi, some viruses, all viroids
• Viruses mollicutes, fastidious vascular
bacteria, and protozoa enter through wounds
made by vectors
• Some pathogens can be only carried by
specific vectors
44. Penetration through natural openings
Many fungi and bacteria enter through:
• Stomata
• Hydathodes
• Nectarthodes
• Lenticels
45.
46. Penetration through stomata
• Underside of the leaf
• Bacteria swim
• Fungi can germinate on a wet surface and enter
a stomata
47. Hydathodes
• Open pores on the margins and tips of leaves
• Connected to veins
• Secrete droplets of liquids containing nutrients
some bacteria but few fungi enter here
• Some enter through nectarthodes which are
similar to hydathodes but on blossoms
48. Lenticels
• Openings on fruits, stems, tubers, filled with
loosely connected cells to allow passage of air
• Relatively few fungi and bacterial enter this
way
• A less efficient , secondary pathway
50. Infection
• pathogens establish contact with the host
• During infection, the pathogen grows or
multiplies, colonizes the host plant
• Infection results in the appearance of
symptoms
• Some infections remain latent and show up
when conditions are more favorable
51. Infection
• Symptoms may show up in 2-4 days or as long
as 2-3 years
• Incubation period
• In most plants the incubation period is from a
few days to a few weeks
52. Infection
• During infection some pathogens:
– Obtain nutrients without killing the cell
– Kill cells and use contents
– Kill cells and disorganize surrounding tissue
– Release enzymes, toxins, growth regulators
53. Invasion
The spread of the pathogen into the host
• apple scab grow between the cuticle and the
epidermis
55. intercellularly
Hyphae of the smut fungus
Ustilago in an infected leaf
(intracellularly)
vascular wilts invade the xylem vessels
(Both fungus and bacteria)
56. Invasion
• Fungi invade intercellularly and intracellularly
and some grow into and throughout the plant
• Bacteria at first invade intercellularly and then
intracellularly
• Bacteria causing vascular wilts invade the
xylem vessels
58. Invasion
• Most nematodes are intercellular some
intracellular and some don’t invade at all but
feed by piercing epidermal cells with their
stylets.
• Viruses, viroids, mollicutes, fastidious bacteria
and protozoa invade by moving from cell to
cell
59. Types of cells and tissues invaded
• Fungi, viruses and viroids invade all types of
cells
• Mollicutes, and protozoa invade phloem sieve
tubes and some parenchyma
• Most fastidious bacteria invade xylem vessels
and a few invade phloem sieve tubes
60. Local and Systemic invasion
• Fungi, bacteria, nematodes, viruses, and
parasitic plants : local
• Fastidious bacteria, mollicutes, and protozoa:
systemic (internal)
• Some fungi, bacteria and viruses are also
systemic
61. Growth and Reproduction of the Pathogen
• Fungi= spores, sexual or asexual
• Parasitic plants= seeds on branches
• Bacteria, mollicutes, protozoa = fission
• Viruses and viroids= replicate
• Nematodes = eggs
62. Location of reproduction
• Most fungi reproduce inside the plant but most
release spores outside
• Powdery mildew on the outside
• Viruses, viroids, mollicutes, protozoa, and
fastidious bacteria only reproduce inside
Growth and Reproduction of the Pathogen
63.
64. Rate of reproduction
• Fungi: millions of spores in a season
• Bacteria divide every 20-30 minutes
• Viruses can produce 100,000 to 10 million particles
in a single cell
• Nematodes lay 300-500 eggs about half female who
do the same and so on
• 2 to 8 million, nematodes are reproduced in one
season during one season
Growth and Reproduction of the Pathogen
67. Fungal spores and seeds
The spores land or are washed out by rain
Spores can be carried from several to several
hundred kilometers (high altitude)
This can cause an epidemic over several years
Bacteria , nematodes may be carried by wind,
water etc
Dissemination by air
68. Wind as a means of dispersal
Short distance dissemination
sporangia of downy mildew
fungi, conidia of powdery
mildew fungi and basidiospores
of rust fungi
Uredospores of rust fungi, Chlamydospores of smut fungi
and conidia of Alternaria, Helminthosporium and
Pyricularia,
Long Distance
69. Bacterial fire blight exudes
Nematodes and spores with ground debris
Windy rain
Touching plants
Dissemination by air
70. Bacteria, nematodes, spores, mycelium
parts in the soil
All Bacteria and many spores are exuded
in a sticky liquid
Rain drops or drops from overhead
irrigation
Dissemination by water
71. Aphids, leafhoppers, whiteflies
Leafhoppers: mollicutes, fastidious bacteria, and
protozoa
Dutch Elm disease and bacterial wilt of cucurbits
soft rot, anthracnose, and ergot are carried by
insects externally
Dissemination by Insects, Mites, and other
Vectors
72. Dissemination by Insects, Mites, and other
Vectors
•Mites and nematodes can also carry virus
pathogens internally and bacteria and fungus
externally
•Animals that walk among plants also carry
•Parasitic plants can carry as they bridge
73. Dissemination by Seed, Transplants,
Budwood, and Nursery Stock
•During propagation
•The grower can infect his own stock and sell
it out to garden centers, home owners etc.
•Crown gall
74. Dissemination by Humans
Handling diseased stock
Tobacco mosaic is transmitted through
cigarettes , shoes, hands
Traveling long distances
Tools carry pathogens from plant to plant
Fireblight is a good example
75. Dissemination by Humans
• Dutch elm disease fungus
• White pine blister rust fungus
• Citrus canker bacterium
• Powdery and downy mildew fungus of
grape (Europe)