The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into various chemical forms as it circulates among the atmosphere and terrestrial and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is nitrogen, making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.
biological nitrogen fixation, which is carried out by diazotrophs, has been dealt with in this slideshare. it involves the mechanism involved and various factors involved therein.
this lesson explains the basic biochemical/biological process behind Nitrogen fixation by microorganism which could be symbiotic or non symbiotic/free living in mechanism.
The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into various chemical forms as it circulates among the atmosphere and terrestrial and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is nitrogen, making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.
biological nitrogen fixation, which is carried out by diazotrophs, has been dealt with in this slideshare. it involves the mechanism involved and various factors involved therein.
this lesson explains the basic biochemical/biological process behind Nitrogen fixation by microorganism which could be symbiotic or non symbiotic/free living in mechanism.
This presentation includes:
1: Introduction
2: Biological nitrogen Fixation- Asymbiotic and symbiotic
3: Mechanism of Nitrogen Fixation
4: Nitrate reduction
5: Ammonia assimilation
6: Nif genes
This presentation is prepared for the teachers and students of life sciences (Biology). it will also help for those who are interested in NET/ SLET and competitive examinations.
Isolation of phosphate solubilizing bacteria (PSB) from soil Likhith KLIKHITHK1
A number of bacterial species provide beneficial effects to a plant and these are mostly present in rhizosphere and hence called rhizobacteria. This group of bacteria has been termed plant growth promoting rhizobacteria. Phosphorus is an essential element for plant development and growth making up about 0.2 % of plant dry weight. Plants acquire P from soil solution as phosphate anions. However, phosphate anions are extremely reactive and may be immobilized through precipitation with cations such as Ca 2+ , Mg 2+ , Fe 3+ and Al 3+. In these forms, P is highly insoluble and unavailable to plants. Different bacterial species has ability to solubilize insoluble inorganic phosphate compounds, such as tricalcium phosphate, di calcium phosphate, hydroxyapatite, and rock phosphate to soluble form, Hence theses bacteria's are referred to as phosphate solubilizing bacteria.
This presentation includes:
1: Introduction
2: Biological nitrogen Fixation- Asymbiotic and symbiotic
3: Mechanism of Nitrogen Fixation
4: Nitrate reduction
5: Ammonia assimilation
6: Nif genes
This presentation is prepared for the teachers and students of life sciences (Biology). it will also help for those who are interested in NET/ SLET and competitive examinations.
Isolation of phosphate solubilizing bacteria (PSB) from soil Likhith KLIKHITHK1
A number of bacterial species provide beneficial effects to a plant and these are mostly present in rhizosphere and hence called rhizobacteria. This group of bacteria has been termed plant growth promoting rhizobacteria. Phosphorus is an essential element for plant development and growth making up about 0.2 % of plant dry weight. Plants acquire P from soil solution as phosphate anions. However, phosphate anions are extremely reactive and may be immobilized through precipitation with cations such as Ca 2+ , Mg 2+ , Fe 3+ and Al 3+. In these forms, P is highly insoluble and unavailable to plants. Different bacterial species has ability to solubilize insoluble inorganic phosphate compounds, such as tricalcium phosphate, di calcium phosphate, hydroxyapatite, and rock phosphate to soluble form, Hence theses bacteria's are referred to as phosphate solubilizing bacteria.
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Health of soil is very important when it comes to gardening or farming. Soil supplies many necessary nutrients required for healthy growth of any crop. The yield is largely dependent on the soil in which the crop grows. So, before cultivation, it is very important to check the soil for its nutrients.
2. Integrated nutrient management ( The nitrogen cycle)Mr.Allah Dad Khan
A Series of Presentation To Trainee in Field By Mr. Allah Dad Khan Former DG Agriculture Extension Department Khyber Pakhtun Khwa Province , Provincial Project Director Crop Maximization Project II ( CMP II) Ministry of Food Agriculture and Livestock Islamabad and Visiting Professor the University of Agriculture Peshawar , Pakistan allahdad52@gmail.com
Roles of microbes in nitrogen cycle aritriyaaritriyajana
There are many presentation on nitrogen cycle.but in my case i have to make a ppt on microbes role in nitrogen cycle.so i made it.and then upload it if anyone get help from it i will be pleased. Aritriya Jana(F.F.Sc)
La desnitrificación es un proceso metabólico que usa el nitrato como receptor terminal de electrones en condiciones anaerobias (ausencia de oxígeno) principalmente, conduciendo finalmente a nitrógeno molecular (gas, N2). La realizan exclusivamente ciertos microorganismos, entre los que destacan Alcaligenes, Paracoccus, Pseudomonas, Thiobacillus, Rhizobium, Thiosphaera, entre otros.Algunas bacterias desnitrificantes son quimiolitoautótrofas y pueden oxidar compuestos inorgánicos de azufre como sulfhídrico (H2S), azufre elemental (S0), tiosulfato(S2O32-) o sulfito(SO32-) anaeróbicamente a expensas de la reducción del nitrato.7 Entre ellas, autótrofos obligados que crezcan a pHs neutros tan solo se conocen dos: Thiobacillus denitrificans y Thiomicrospira denitrificans8 y pueden llevar a cabo la sulfoxidación en condiciones aeróbicas o anóxicas. Recientemente se ha aislado Thioalkalivibrio denitrificans, un autótrofo, oxidador de azufre, capaz de crecer anaeróbicamente usando nitrito como aceptor de electrones a pH básico9
Las ventajas de este proceso respecto a la heterotrofía son varias. Para el tratamiento de aguas residuales, evita tener que añadir materia orgánica, reduciéndose así los costes, y para tratamiento de aguas potables, evita carbono residual en el efluente, ya que reduce el riesgo de sobrecrecimiento en los sistemas a tratar y de desinfección de la zona por los productos producidos debido a que los organismos autotrófos crecen más despacio y producen menos biomasa, con la consiguiente formación de menos productos celulares.10 Además los organismos autótrofos están mejor adaptados para el tratamiento de aguas subterráneas porque crecen a bajas concentraciones de compuestos orgánicos biodegradables. También posee un gran interés comercial y desde el punto de vista de la biotecnología ambiental puesto que es uno de los pocos ejemplos en los que puede oxidarse biológicamente compuestos reducidos del azufre (sulfoxidación) en ausencia de oxígeno elemental. Pero la principal ventaja de este proceso es la aparición de la desnitrificación acoplada a la oxidación de compuestos reducidos del azufre, combinando la eliminación simultánea de dos tipos de contaminantes, los nitratos y los compuestos reducidos del azufre (ecuación 2), teniendo así gran interés por sus aplicaciones biotecnológicas.
Principales parámetros que afectan la desnitrificación
Temperatura
De acuerdo con la literatura, los microorganismos desnitrificantes presentan actividad entre 5 y 75 °C.11 Se ha visto que no existe un cambio significativo en la actividad desnitrificante entre 20 y 30 °C con consorcios provenientes de plantas de tratamiento de aguas residuales.12
pH
El pH óptimo para la desnitrificación se encuentra entre 7 y 8.413 A valores de pH debajo de 6, se inhibe la enzima óxido nitroso reductasa y se acumula óxido nitroso.1411 En la revisión de Cervantes-Carrillo et al. (2000)13 se reporta que en cultivos continuos no se observa ninguna acumulación
Similar to Lab.11 methods for estimating denitrification process (20)
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
FIDO Alliance Osaka Seminar: Passkeys at Amazon.pdf
Lab.11 methods for estimating denitrification process
1.
2. Subject objective: Each student should be able
to
– What is the important and how Denitrification take
places in the nature?
– Obtaining an evolution of (Denitrification) in different
soil sources.
– Practical detection of nitrogen gas from reducing
nitrate compounds, through using broth medium
inoculated with standard bacteria or different
garden soil samples.
10. DENITRIFICATION:
Denitrification is defined as the reduction of nitrates to nitrites an eventually to nitrogen
gas. (NO-3) to gaseous dinitrogen (N2O, NO, and N2) these gases escape
(volatilize) into Earth's atmosphere and are not available for plant use. Because
oxygen is not necessary for denitrification to occur, this is a form of anaerobic
respiration in which the nitrates serve as electron acceptors for the denitrifying
bacteria in their energy metabolism. Denitrification takes place most rapidly in
waterlogged anaerobic soil. The four steps in the denitrification process are as
follows:
Bacteria that makes this process like:
• Pseudomonas denitrificans
• Paracoccus denitrificans
• Thiobacillus denitrificans
• Micrococcus denitrificans
• Serratia sp.
• Achromobacter sp.
• (Thermophilic denitrifier) has even been isolated from a hot spring.
The most favorable environments for these organisms are:
1. Heavily fertilized agricultural soils.
2. Sewage where nitrogenous compounds abound in considerable quantity.
11.
12. Denitrification converts nitrates (NO3) in the soil
to atmospheric nitrogen (N2) replenishing the
atmosphere.
Nitrogen in atmosphere (N2)
Nitrates (NO3)
in Soil
14. Denitrifying bacteria live deep in soil and in aquatic
sediments where conditions make it difficult for them
to get oxygen. The denitrifying bacteria use nitrates
as an alternative to oxygen, leaving free nitrogen
gas as a byproduct. They close the nitrogen cycle!
Nitrogen in atmosphere
closes the nitrogen cycle!
(N2)
(NO3)
Denitrifying bacteria live
deep in soil and use
nitrates as an alternative
to oxygen making a
byproduct of nitrogen gas.
15. Other ways that nitrogen
returns to the atmosphere…
Emissions from industrial combustion and Volcano eruptions
gasoline engines create nitrous oxides emit nitrous oxides
gas (N2O). gas (N2O).
16.
17. Denitrifying microorganism
• Anaerobic to reduce the nitrate to gaseous form of nitrogen.
• Room tmperature
• The predominant saturated and unsaturated fatty acids in all
denitrifying isolates are generally n-hexadecanoic acid (16:0) and
cis-11- octadecenoic acid (18:1 ω7c).
• Microscopically :Grame negative whit rod shape.
• Biochemical test and API test are probably used for identification
• 16S RNA sequencing is more reliable for characterization.
• Medium for nitrification should contain nitrate and incubated in
mesophile temperature range
18. Materials for denitrification:
• Garden soil
• Broth culture of Pseudomonas
• 2 nitrate broth tubes containing Durham tubes
• 2 nitrate free broth tubes containing Durham tubes
• -napthylamine reagent
• sulfanilic acid
• powdered zinc
• Blenders, fresh soil sample, 90 ml distilled water
• Graduate 1 ml pipette, 1 Petri plate of nitrate agar,
GasPak anaerobic jar, generator envelopes
19. Method: To isolate denitrifiers from a soil sample, the following conditions must be met
in the growth medium:
1. In this exercise a medium containing a nitrate substrate is used for gas formation and
a Durham tube is used to detect gas (N) production.
2. Some nitrate must be available, which will provide the only terminal electron acceptor
for the generation of ATP.
3. Some peptone must be present to provide essential amino acids needed by some
denitrifiers. The next step is to demonstrate the ability of the organism to generate
visible nitrogen gas. An isolate that grows on nitrate media and generates gas can be
presumed to be a denitrifier.
Procedure:
• First Period: The nitrate agar used in the Petri plate is essentially nutrient agar to
which 0.5% KNO3 is added.
• Procedure:
1. Add 10 grams of soil to 90 ml of water.
2. Blend for 2 minutes.
3. Label the bottom of a nitrate agar plate with your name and date of inoculation.
4. Pipette 1.0 ml of the blended mix onto the surface of a plate of nitrate agar.
5. Spread the inoculum over the surface of the agar with a bent glass rod.
6. Incubate the plate, inverted, at 30° C for 3 to 5 days in a GasPak anaerobic jar.
20. Second Period
• During this period, nitrate agar plates will be examined to select colonies that have developed
during the incubation period. Since the presence of growth doesn’t necessarily mean that the
organism is a denitrifier, it will be necessary to see if any of the isolates are nitrogen gas
producers; thus, Durham tube nitrate broths must be inoculated and incubated anaerobically.
Nitrate broth consists of nutrient broth plus (0.5% KNO3).
1. Inoculate one tube of nitrate broth containing a Durham tube with 1g of soil. DO NOT SHAKE
THE CULTURE TUBES DURING INCUBATION.
2. Inoculate the second tube with a loopful of Pseudomonas.
3. Repeat steps 1 and 2 with the nitrate free broth tubes.
4. Label all tubes and incubate at room temperature for 7 days.
5. Observe the tubes for gas formation.
6. Add 1 ml - naphthalene reagent and 1 ml sulfanilic acid reagent to each of the culture tubes
and mix. The development of a red color within 30 seconds indicates that nitrites are present.
7. After carrying out step 6, any tube that fails to develop a red color could still have its full supply
of nitrate (i.e. lacks bacteria to reduce it) or it could have undergone denitrification without nitrite
being further converted to nitrogen. To distinguish between the two possibilities, a pinch of zinc
must be added to any tube that did not turn red. The zinc catalyses the reduction of nitrate to
nitrite and produces a red color within minutes if nitrate was present. Lack of a red color
indicates the absence of nitrate (and possibly the presence of nitrite).
8. Record your results.
Third Period
This period of inoculations is in preparation of trying to do a definitive identification of a denitrifier.
From an isolated colony a nutrient broth is inoculated and a gram-stained slide is made. After
incubation, the broth culture can be used as a stock culture for doing further tests to identify
your isolate. The slide will reveal the morphological nature of your organism.