This document provides an overview of microbial taxonomy and methods for classifying microorganisms. It discusses the taxonomic hierarchy from domain to species and describes various morphological, biochemical, and molecular techniques used to identify and classify microbes, including staining methods, biochemical tests, serology, phage typing, nucleic acid analysis, and numerical taxonomy. The document aims to explain the criteria and analytical processes involved in the formal identification and organization of microorganisms.
This presentation contains information about Bacterial Taxonomy, techniques of bacterial classification (Classical and Molecular characteristics) and Bergey's Manual
The archaebacteria
group members
Rameen nadeem
Syeda iqra hussain
Hina zamir
Mahnoor khan
Maleeha inayat
Background
Biologists have long organized living things into large groups called kingdoms.
There are six of them:
Archaebacteria
Eubacteria
Protista
Fungi
Plantae
Animalia
Some recent findings…
In 1996, scientists decided to split Monera into two groups of bacteria:
Archaebacteria and Eubacteria
Because these two groups of bacteria were different in many ways scientists created a new level of classification called a DOMAIN.
Now we have 3 domains
Bacteria
Archaea
Eukarya
KingdomArchaebacteria
Any of a large group of primitive bacteria having unusual cell walls, membrane lipids, ribosomes, and RNA sequences, and having the ability to produce methane and to live in anaerobic, extremely hot, salty, or acidic conditions
The Domain Archaea
“ancient” bacteria
Some of the first archaebacteria were discovered in Yellowstone National Park’s hot springs
Prokaryotes are structurally simple, but biochemically complex
Basic Facts
They live in extreme environments (like hot springs or salty lakes) and normal environments (like soil and ocean water).
All are unicellular (each individual is only one cell).
No peptidoglycan in their cell wall.
Some have a flagella that aids in their locomotion.
Most don’t need oxygen to survive
They can produce ATP (energy) from sunlight
They can survive enormous temperature extremes
They can survive under rocks and in ocean floor vents deep below the ocean’s surface
They can tolerate huge pressure differences
STRUCTURE
Size
Archaea are slightly less than 1 micron long.
A micron is 1/1,000 of a millimeter.
In order to see their cellular features, scientists use powerful electron microscopes.
Shape
Shapes can be spherical or ball shaped and are called coccus.
Others are rod shaped, long and thin, and labeled bacillus.
Variations of cells have been discovered in square and triangular shapes.
STRUCTURE
Locomotion
Some archaea have flagella, hair-like structures that assist in movement.
There can be one or many attached to the cell's outer membrane. Protein networks can also be found on the cell membrane, which allow cells to attach themselves in groups.
Cell Features
Within the cell membrane, the archaea cell contains cytoplasm and DNA, which are in single-looped forms called plasmids.
Most archaeal cells also have a semi-rigid cell wall that helps it to maintain its shape and chemical balance.
This protects the cytoplasm, which is the semi-liquid gel that fills the cell and enables the various parts to function.
STRUCTURE
Phospholipids
The molecules that make up cell membranes are called phospholipids, which act as building blocks for the cell.
In archaea, these molecules are made of glycerol-ether lipids.
Ether Bonding
The ether bonding makes it possible for archaea to survive in environments that are extremely acidic or al
Halophiles (Introduction, Adaptations, Applications)Jamil Ahmad
Introduction
Halophiles are organisms that thrive in high salt concentrations.
They are a type of extremophile organisms. The name comes from the Greek word for "salt-loving".
While most halophiles are classified into the Archaea domain, there are also bacterial halophiles and some eukaryota, such as the alga Dunaliella salina or fungus Wallemia ichthyophaga
This presentation contains information about Bacterial Taxonomy, techniques of bacterial classification (Classical and Molecular characteristics) and Bergey's Manual
The archaebacteria
group members
Rameen nadeem
Syeda iqra hussain
Hina zamir
Mahnoor khan
Maleeha inayat
Background
Biologists have long organized living things into large groups called kingdoms.
There are six of them:
Archaebacteria
Eubacteria
Protista
Fungi
Plantae
Animalia
Some recent findings…
In 1996, scientists decided to split Monera into two groups of bacteria:
Archaebacteria and Eubacteria
Because these two groups of bacteria were different in many ways scientists created a new level of classification called a DOMAIN.
Now we have 3 domains
Bacteria
Archaea
Eukarya
KingdomArchaebacteria
Any of a large group of primitive bacteria having unusual cell walls, membrane lipids, ribosomes, and RNA sequences, and having the ability to produce methane and to live in anaerobic, extremely hot, salty, or acidic conditions
The Domain Archaea
“ancient” bacteria
Some of the first archaebacteria were discovered in Yellowstone National Park’s hot springs
Prokaryotes are structurally simple, but biochemically complex
Basic Facts
They live in extreme environments (like hot springs or salty lakes) and normal environments (like soil and ocean water).
All are unicellular (each individual is only one cell).
No peptidoglycan in their cell wall.
Some have a flagella that aids in their locomotion.
Most don’t need oxygen to survive
They can produce ATP (energy) from sunlight
They can survive enormous temperature extremes
They can survive under rocks and in ocean floor vents deep below the ocean’s surface
They can tolerate huge pressure differences
STRUCTURE
Size
Archaea are slightly less than 1 micron long.
A micron is 1/1,000 of a millimeter.
In order to see their cellular features, scientists use powerful electron microscopes.
Shape
Shapes can be spherical or ball shaped and are called coccus.
Others are rod shaped, long and thin, and labeled bacillus.
Variations of cells have been discovered in square and triangular shapes.
STRUCTURE
Locomotion
Some archaea have flagella, hair-like structures that assist in movement.
There can be one or many attached to the cell's outer membrane. Protein networks can also be found on the cell membrane, which allow cells to attach themselves in groups.
Cell Features
Within the cell membrane, the archaea cell contains cytoplasm and DNA, which are in single-looped forms called plasmids.
Most archaeal cells also have a semi-rigid cell wall that helps it to maintain its shape and chemical balance.
This protects the cytoplasm, which is the semi-liquid gel that fills the cell and enables the various parts to function.
STRUCTURE
Phospholipids
The molecules that make up cell membranes are called phospholipids, which act as building blocks for the cell.
In archaea, these molecules are made of glycerol-ether lipids.
Ether Bonding
The ether bonding makes it possible for archaea to survive in environments that are extremely acidic or al
Halophiles (Introduction, Adaptations, Applications)Jamil Ahmad
Introduction
Halophiles are organisms that thrive in high salt concentrations.
They are a type of extremophile organisms. The name comes from the Greek word for "salt-loving".
While most halophiles are classified into the Archaea domain, there are also bacterial halophiles and some eukaryota, such as the alga Dunaliella salina or fungus Wallemia ichthyophaga
transformation in bacteria is a classical example of horizontal gene transfer which leads to enhanced survivability and also introduction of variations that may lead to evolution
Virus isolation in embryonated eggs, cell cultures and animals
Purification by centrifugation, chromatography and electrophoresis
3d models such as organoid cultures is not discussed
Capsule is an layer around the bacteria cell which gives bacteria the protection and pathogenicity. Staining such an layer is difficult with the normal stains so it is necessary to stain the background and the cell itself which makes the capsule appear colourless.
Bergey's Manual and it's classification. A brief concised presentation prepared for taking seminar and classes.
Volume II (Edition 2) described more in detail.
transformation in bacteria is a classical example of horizontal gene transfer which leads to enhanced survivability and also introduction of variations that may lead to evolution
Virus isolation in embryonated eggs, cell cultures and animals
Purification by centrifugation, chromatography and electrophoresis
3d models such as organoid cultures is not discussed
Capsule is an layer around the bacteria cell which gives bacteria the protection and pathogenicity. Staining such an layer is difficult with the normal stains so it is necessary to stain the background and the cell itself which makes the capsule appear colourless.
Bergey's Manual and it's classification. A brief concised presentation prepared for taking seminar and classes.
Volume II (Edition 2) described more in detail.
electronic devices based on Ultrasound to remove biofilmFrancois Stepman
Biofilm is the excellent feeding and breeding ground for bacteria and viruses.
• Biofilm occurs very fast. Higher temperatures are ideal for their propagation.
• Chemical cleaning will, if properly deployed, kill a large amount of biofilm, however
always small quantities will remain in the porous environment of the pipe
network.
• Since bacteria propagate in this environment also bad bacteria and viruses will
propagate.
• Since no chemical treatment can be used when the chickens are in the
stable, the biofilm buildup will continue.
• Since the feeding water is not free of bacteria, they find in the biofilm a
good place to propagate.
• Ultimately this will cause sickness and death in the stables and will enforce the use of
medicines ( antibiotics)
Intro of Micro-organisms, Bacteria, Use of bacteria, Harmful bacteria,Reproduction in bacteria, virus,
Reproduction in virus, Fungi, Use of fungi, Harmful fungi,
Reproduction in fungi
Trends in the geometric size and rated power capacity of offshore wind turbines, the main components of an OWT system, encompassing a typical monopile foundation, the substructure, transition piece, the tower, rotor blades and nacelle (hub). Modern OWTs are installed with either pitch-regulated blades or variable rotational speed systems in order to allow optimisation of the power production over a wide range of prevailing wind speeds. The rotational speed of the main rotor shaft is typically between about 10 and 20 rp. Key electromechanical components of the wind turbine, including the gearbox and the generator (Roberts et al.,2007). The gearbox may cause efficiency losses for the wind turbine and is the particular source of the noise. Recent developments in the design of permanent magnet generators have made it possible to construct some types of wind turbines without the requirement for a gearbox. In this case, the rotor is mainly connected directly to a low-speed multi-pole generator that rotates at the same speed, termed the direct-drive unit. Removing the gearbox mainly removes one of the key components requiring more maintenance, and that is mainly prone to failure. This simplification of the mechanical part allows reductions in size and the mass of the nacelle (Gilling, 2009).
The source of energy captured by plants is the sun, which will be the constant source of energy for the next few billion years. The carbon released from the burning of biofuels is continually cycled rather than being released from the ancient fixed carbon sources, as is the case for fossil petroleum and natural gas. The problem is that the cost of the production of fuels from lignocellulose and plant oils is high and this nascent industry cannot compete with the oil prices. Current progress: For the past two decades, ethanol has been synthesized primarily from cornstarch and cane sugar. Fourteen billion gallons of ethanol were synthesized in the USA from cornstarch in 2014. Approximately 40% of the current USA corn crop is availed to produce ethanol and is not likely to expand anymore, because the remainder of the crop is being availed for animal feed and human food. Ethanol is produced from cane sugar in Brazil at a level of 7.2 billion gallons in the year 2014. The renewable energy source is the major terrain to be considered (Sreeremya, 2019).
Agroforestry has a high potential for simultaneously satisfying three important objectives viz., protecting and also stabilizing the ecosystems; producing a high level of output of economic goods; and improving the income and basic materials to the rural population. It has helped in the rehabilitation of the degraded lands on the one hand and has increased farm productivity on the other. At present, agroforestry meets almost half of the demand for fuelwood, 2/3 of the small timber, approx. 70-80 per cent wood for plywood, 60 per cent raw material for paper pulp and approx. 9-11 per cent of the green fodder requirement of livestock, besides meeting the subsistence needs of the households for food, fruit, fiber, medicine etc.
Human population genetics aims to study the population in terms of the genetic variation. This variation can be quantified by determining the gene frequencies of the alleles at segregating loci which mainly characterize one population and distinguish with another. Tasting ability to phenylthiocarbamide (PTC) by an individual is mainly considered as a useful and important tool to study the genetic diversity in the human populations. Taste and smell affects the food preferences and dietary habits, thereby directly influencing the eating behavior of an individual. As taste threshold aggrandizes with age, abnormality in taste function may contribute to the poor dietary intake in the elderly. Bitter taste perception is a conserved the chemical sense against the ingestion of naturally toxic substances in mammals. The experience of the bitterness occurs after certain chemicals contact taste receptors located in cells on the surface of the tongue.
Initial corrosion behavior of element copper in atmospheric environmentDr. sreeremya S
Copper and copper-based alloys encompassing brasses (Cu-Zn) and bronzes (Cu-Sn)are widely used in different industrial and the societal applications. They are common engineering materials in modern architecture and primarily availed for roofing and facade cladding due to their significance of visual appearance (important from an architectural perspective in terms of the design or during renovation of modern or ancient cultural building), ductility, malleability, the atmospheric corrosion resistance and long-term performance. When exposed to air, the copper forms a brownish-green or greenish blue corrosion layer, often denoted as the patina. Copper patina is commonly known as an aesthetically pleasing surface, and one reason for the extensive use of the copper metal and copper-based alloys in both the ancient and modern architecture. One of the most famous examples is the Statue of Liberty in the harbor of the New York, US.
Bronze alloys are the family of copper-based alloys traditionally alloyed with tin. Bronze alloys are of the exceptional historic interest and still finds wide applications.
These approaches encompass new synthesis and processes as well as new tools for instructing aspiring chemists how to do the chemistry in a more environmentally benign manner. The pros to industry as well as the environment are all a part of the positive impact that Green Chemistry is having in the chemistry community and in the society in general. It is important that chemists develop novel Green Chemistry options even on an incremental basis. While all the elements of the lifecycle of a new chemical or process may not be environmentally benign, it is nonetheless pivotal to improve those stages where improvements can be made. The next phase of assessment can then focus on the elements of the lifecycle that are still in need of the improvement. Even though a new Green Chemistry methodology does not solve at once every problem allied with the lifecycle of a particular chemical or process, the advances that it does make are nonetheless very key. Green Chemistry that mainly possesses the spirit of sustainable development was booming in the 1990s
Electron transfer activity of the photosystem II significantly decreased after the exposure of the Chlorella cells to all the six chemicals availed. Lipid peroxidation was slightly reduced by the antioxidant propyl gallate, not changed by indium nitrate and very potently simulated by diethanolamine, chloroquine, sodium monofluoroacetate and the bromobenzene. For five of the chemicals studied (not bromobenzene) there is the very good correlation between the cytotoxic effects in Chlorella cells measured by the algal growth inhibition test, and also the inhibition of photosystem II activity (Chapman et al., 1991). The results suggest that one very key effect of these chemicals in the Chlorella cells is the inhibition of photosynthetic metabolism by the blocking of the photosystem II functionality.
Corona virus was first identified as the cause of the common cold in 1960. In one study carried out in Canada in 2001, more than 510 patients presented with flu-like symptoms. Virological analyses showed that 3.7% of these cases were positive for the HCoV-NL63 strain by polymerase chain reaction (PCR). Until 2002, the corona virus was considered a relatively simple, nonfatal virus; however, an outbreak in 2002–2003 in the Guangdong province in China, which resulted in spread to many other countries, encompassing Thailand, Vietnam, Taiwan, Hong Kong Singapore, and the United States of America, causes severe acute respiratory syndrome (SARS) and high mortality rates in over 1000 -1100 patients.
In the modern times pollution has become the biggest menace for the survival of the biological species. There are different types of pollution e.g. air, water, soil, sound and mental pollution. Earth was the beautiful landscape but man has ruthlessly exploited for his greed specially, in the last century. With sporadic industrialization and random urbanization environmental pollution has become the serious problem. Over exploitation of open spaces, ever-increasing number of automobiles and the demographic pressure has further aggravated the problem. There are different ways and means to mitigate the urban environmental pollution. Plan-ting of trees and the shrubs for abatement of pollution and improvement of environment is a much effective way and well recognized throughout the world. Earlier, the purpose of planting trees in the urban areas was purely aesthetic (Sheldon et al., 1988a). The incessant increase of urban environmental pollution has necessitated to typically reconsider the whole approach of urban landscaping and its orientation in the order to achieve duel effect i.e. bio-aesthetics and mitigation of pollution.
Relation between haemorrhoids and constipationDr. sreeremya S
Patients frequently complain of bleeding with or without the defecation, a swelling, mild discomfort or irritation. Other symptoms may include soilage or the mucous discharge, pruritis, difficulties with the hygiene, and a sense of incomplete evacuation. Internal hemorrhoids are otherwise painless unless they are mainly thrombosed, prolapsed with edema, or strangulated. External hemorrhoids result in pain when the thrombosis occurs and bleeding if ulceration occurs from pressure necrosis. Skin tags may form from the prior acutely edematous or the thrombosed external haemorrhoids (Johanson et al., 1990
Given the rapid aggrandize, it has been postulated the environment has a key role in the causation of obesity. Factors such as the neighborhood-scale features (referred to as the built environment) have been mainly identified as influencing diet and physical activity (2). Of particular the importance to this framework are features of the food environment (FE), thus constituting barriers and opportunities to food sources of the varying nutritional quality and energy density (3). The FE is delineated as the physical presence of food that can mainly influence a person’s diet (4). Contributing to the FE is the proximity to food store locations such as mainly the restaurants (fast-food, full service, and bars and pubs) and the retail outlets (food markets/grocery stores and liquor stores). Fast- food establishments generally have foods of lower nutritional quality and higher caloric density than the home-prepared foods (3). Early studies have reported fast-food restaurants to be more common in the neighborhoods with a higher prevalence of obesity. However, more recent studies have been melanged,
Adverse conditon provided for influenza virus (mutatedDr. sreeremya S
THIS MUTATED INFLUENZA VIRUS CAN BE TREATED IN PH1-2 . TO CHECK THE LYSIS OF THE VIRUS
SIMULATING THE INTERFERON ACTIVITY HAS TO BE DONE SIMULTANEOUSLY.
Although 76-90% of the BMW is non-hazardous and harmless as any of the other municipal waste, the remaining 10-26% is hazardous to humans or animals and deleterious to environment. Inappropriate handling of the BMW may have serious public health consequences and the significant impact on the environment. Major hospitals contribute substantially to the quantum of generation of the BMW. Smaller hospitals, the nursing homes, clinics, the pathological laboratories and blood banks also have major contribution to BMW. The common methods adopted for the BMW disposal are incineration and land filling. However, these methods are mainly considered more expensive and less ecofriendly due to their main negative impact on the environment
Corona virus current scenario (theoretical outlook)Dr. sreeremya S
Corona virus(COVID-19) is RNA virus. Which has proved to be pandemic.It causes respiratory disease called Severe Acute Respiratory Syndrome(SARS). Currently it is a deadly disease which is killing hundreds of people day by day from late 2019 to till date. There is only few studies regarding the corona virus infection in animals. Studies are still progressing to find remedies like variolation, RNA silencing or boosting human interferon’s to decrease the affect of the disease.
INTRODUCTION
As people have seen, the giant industrial wind farms, small household wind turbines, and also everything in between are erecting all over the places. In 2012, the electricity capacity from the wind power in the total electric capacity is about 7.2% in EU, 2.0% in China, and 3.6% in US. Nevertheless, most people agree that wind energy should claim much greater share of the future energy supply. For eg:-, the United States is working on an ambitious target of 21% total electricity capacity by 2030. Indeed, wind energy is one of the fastest growing energy sources today and also in the foreseeable future. However, findings a suitable site to build the wind farm or simply set up the wind turbine is not always easy. The wind must be strong and must be consistent; the tower cannot obstruct the view; and the noise cannot disturb the local residence. Due to the fast growth of the population, it is aggrandizingly difficult to find a suitable place that is proper for a wind turbine yet will not interfere with the people’s everyday life (Srensen et al., 2002).
INTRODUCTION
A lot of basic concepts, technologies and pioneering solutions aiming on very high power densities were mainly developed within the last 20 years. Sometimes this is denoted as the mechatronic system integration or simply as mechatronics. Besides many of the technical aspects, the movings within the value chain represent the great challenge in this process. This is because traditionally defined between electronic device and the power module manufacturers, electronics assemblers, and the metalworking industry will blur or slowly disappear. However, the pressure to go this path increases. If one thinks, e.g., about the hybrid drive as an upgrade option for conventional passenger cars, one is directly faced with the lack of construction space as one of the main serious problems (Alkuhayli et al., 2012).
Pellagra may also occur as the result of a variety of (relatively rare) conditions affecting tryptophan metabolism and as a side-effect of the number of drugs that inhibit tryptophan metabolism. In alcoholics, it is unclear whether pellagra is the result of an impairment of tryptophan and the niacin metabolism directly attributable to alcohol, or whether it reflects general under nutrition among the people who obtain a considerable proportion on their energy needs from alcohol, and hence have the low intake of (nutrient rich) foods(Goldberger et al.,1922a).
SYMPTOMS
The major symptoms of pellagra are dermatitis, dementia, and diarrhea. This is because niacin deficiency is most noticeable in the body parts with high rates of cell turnover, such as the skin or gastrointestinal tract (Goldberger et al., 1923).
The growing interest in the environmental stress has been accompanied by a rapid accumulation of evidence indicating that the environment can elicit substantial stress in people living in urban environments. Furthermore, it is widely conceived that the natural environment can enhance human health. There have been several questionnaire studies and investigations on the psychological effects of forest environments. A previous study found an enhancement of the positive emotions among subjects who were shown pictures of natural environments. Moreover, other researches have also found that forest environments improve the psychological wellbeing of people
As the techniques that have enabled us to analyses and assess a biopsy become ever more sophisticated, we have realised the limitations of looking at the single snap-shot of the tumour. This single-biopsy bias was highlighted in which it was mainly demonstrated that a portion taken from different parts of a primary tumour and its metastases showed and proved extensive intertumoural and intratumoural evolution. This tumoural heterogeneity mainly highlights the difficulty of dictating a therapeutic course of action based on the single biopsy, as it is likely to underestimate the ramification of the genomic landscape of the tumour (Chomczynski et al., 2016).Having established that there is mainly considerable tumour heterogeneity, taking multiple biopsies from the patients‘ primary tumour and the metastases would seem to be the most obvious next step. There are so much difficulties in obtaining the tissue biopsy— including the discomfort suffered by the patient, the inherent clinical risks to the patient
Rivivna humilis berry extract as fungal sourceDr. sreeremya S
The introduction of the mankind had marked the continuous exploitation of the plants as organisms and their products for the pharmacological prospects and key features (Guha et al., 1999). In most of the agronomic domains around the globe, the conventional modes of the treatment are still in exercise and also in upcoming research (Srivastava et al., 2003).
These approaches most commonly exploit the various dynamics and much specific potential and applications of plant extracts (Bonde et al., 2007) . The distinctions of the first and foremost large-scale screening of the green plants evaluate and also assess the antimicrobial activity of 2,300 plants (Nautiyal et al., 1984).
Dyeing is an ancient and traditional art which predates written records. It was practised specifically during the Bronze Age in Europe (Sreeremya, 2016). Conventional dyeing techniques encompassed sticking plants to fabric or rubbing crushed pigments into cloth.
Toxic effects of heavy metals : Lead and Arsenicsanjana502982
Heavy metals are naturally occuring metallic chemical elements that have relatively high density, and are toxic at even low concentrations. All toxic metals are termed as heavy metals irrespective of their atomic mass and density, eg. arsenic, lead, mercury, cadmium, thallium, chromium, etc.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Salas, V. (2024) "John of St. Thomas (Poinsot) on the Science of Sacred Theol...Studia Poinsotiana
I Introduction
II Subalternation and Theology
III Theology and Dogmatic Declarations
IV The Mixed Principles of Theology
V Virtual Revelation: The Unity of Theology
VI Theology as a Natural Science
VII Theology’s Certitude
VIII Conclusion
Notes
Bibliography
All the contents are fully attributable to the author, Doctor Victor Salas. Should you wish to get this text republished, get in touch with the author or the editorial committee of the Studia Poinsotiana. Insofar as possible, we will be happy to broker your contact.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
DERIVATION OF MODIFIED BERNOULLI EQUATION WITH VISCOUS EFFECTS AND TERMINAL V...Wasswaderrick3
In this book, we use conservation of energy techniques on a fluid element to derive the Modified Bernoulli equation of flow with viscous or friction effects. We derive the general equation of flow/ velocity and then from this we derive the Pouiselle flow equation, the transition flow equation and the turbulent flow equation. In the situations where there are no viscous effects , the equation reduces to the Bernoulli equation. From experimental results, we are able to include other terms in the Bernoulli equation. We also look at cases where pressure gradients exist. We use the Modified Bernoulli equation to derive equations of flow rate for pipes of different cross sectional areas connected together. We also extend our techniques of energy conservation to a sphere falling in a viscous medium under the effect of gravity. We demonstrate Stokes equation of terminal velocity and turbulent flow equation. We look at a way of calculating the time taken for a body to fall in a viscous medium. We also look at the general equation of terminal velocity.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
The ability to recreate computational results with minimal effort and actionable metrics provides a solid foundation for scientific research and software development. When people can replicate an analysis at the touch of a button using open-source software, open data, and methods to assess and compare proposals, it significantly eases verification of results, engagement with a diverse range of contributors, and progress. However, we have yet to fully achieve this; there are still many sociotechnical frictions.
Inspired by David Donoho's vision, this talk aims to revisit the three crucial pillars of frictionless reproducibility (data sharing, code sharing, and competitive challenges) with the perspective of deep software variability.
Our observation is that multiple layers — hardware, operating systems, third-party libraries, software versions, input data, compile-time options, and parameters — are subject to variability that exacerbates frictions but is also essential for achieving robust, generalizable results and fostering innovation. I will first review the literature, providing evidence of how the complex variability interactions across these layers affect qualitative and quantitative software properties, thereby complicating the reproduction and replication of scientific studies in various fields.
I will then present some software engineering and AI techniques that can support the strategic exploration of variability spaces. These include the use of abstractions and models (e.g., feature models), sampling strategies (e.g., uniform, random), cost-effective measurements (e.g., incremental build of software configurations), and dimensionality reduction methods (e.g., transfer learning, feature selection, software debloating).
I will finally argue that deep variability is both the problem and solution of frictionless reproducibility, calling the software science community to develop new methods and tools to manage variability and foster reproducibility in software systems.
Exposé invité Journées Nationales du GDR GPL 2024
2. Taxonomy
Organizing, classifying and naming living things
Formal system originated by Carl von Linné (1701-
1778)
Identifying and classifying organisms according to
specific criteria
Each organism placed into a classification system
6. 3 Domains
Eubacteria
true bacteria, peptidoglycan
Archaea
odd bacteria that live in extreme environments, high
salt, heat, etc. (usually called extremophiles)
Eukarya
have a nucleus & organelles (humans, animals, plants)
7. Taxonomy
4 main kingdoms:
Protista
Fungi
Plantae
Animalia
Algae
8. Naming Micoorganisms
Binomial (scientific) nomenclature
Gives each microbe 2 names:
Genus - noun, always capitalized
species - adjective, lowercase
Both italicized or underlined
Staphylococcus aureus (S. aureus)
Bacillus subtilis (B. subtilis)
Escherichia coli (E. coli)
9. CRITERIA FOR IDENTIFICATION AND
CLASSIFICATION
Morphological Characteristics.
Differential Staining.
Biochemical Tests.
Serology: Slide Agglutination Test, ELISA, Western
Blot.
Phage Typing.
Amino Acid Sequencing
10. a. Morphological characteristics
• Cell shape and size, arrangement of cells,
arrangement of flagella, capsule, endospores,
mechanism of motility
11. b. Differential staining- staining properties
– e.g., Gram stain reaction and acid-fast
stain reaction
Gram stain is an example of differential
staining—procedures that are used to
distinguish organisms based on their
staining properties
Use of the Gram stain divides Bacteria into
two classes—
gram negative and gram positive.
12. Gram Stain
•Based on cell wall
composition
and peptidoglycan thickness
•Gram positive cell wall
•Gram negative cell wall
15. •Red dye basic carbolfuchsin
is the principal stain
•Background is
counterstained with
methylene blue
•Stain based on the mycolic
(glycolipid) acid content of
the cell wall
•Mycobacterium species is
stained red, while
background is stained blue
Acid Fast Stain
16. Acid-fast staining is another important differential
staining procedure. It is most commonly used to
identify Mycobacterium tuberculosis and M. leprae the
pathogens responsible for tuberculosis and leprosy,
respectively.
17. Other types of Stain
Endospore stain with
Schaeffer-Fulton stain
Flagella stain with
carbolfuchsin dye
Flagellar stain of Proteus vulgaris.
A basic stain was used to build up the
flagella
Endospore stain, showing endospores
(red) and vegetative cells (blue)
18. Endospore staining, like acid-fast staining, also
requires harsh treatment to drive dye into a target, in
this case an endospore.
An endospore is an exceptionally resistant structure
produced by some bacterial genera (e.g., Bacillus
and Clostridium). It is capable of surviving for long
periods in an unfavorable environment and is called
an endospore because it developswithin the parent
bacterial cell.
19. Quality assurance- PROTOZOA
Microscope counts. Care must be taken to ensure that the particles being counted
are (oo)cysts, to determine whether or not they contain sporozoites, and to
exclude algae and yeast cells from any counts that are made. The criteria used for
determining that a particle is in fact a Cryptosporidium oocyst or a Giardia cyst
vary between laboratories. Some workers use only the fact that (oo)cysts fluoresce
when labelled with a fluorescein isothiocyanate-tagged anti-Cryptosporidium or
anti-Giardia monoclonal antibody and that it is in the proper size range for a
cyst or oocyst. Others will additionally use differential interference contrast
microscopy or nucleic acid stains to ascertain that the particles counted are indeed
(oo)cysts. This more detailed analysis allows the confirmation of the counted particles
as presumptive (oo)cysts.
Many factors influence the microscope counts: the amount of background
debris and background fluorescence, the experience and alertness of the technician
who performs the count, the intensity of fluorescence after staining with the
monoclonal antibody, and the quality of the microscope. Quality assurance protocols
should define how these factors are addressed
20. NEGATIVE STAINING-
Negative staining is an easy, rapid, qualitative method for examining the structure
of isolated organelles, individual macromolecules and viruses at the EM level.
However, the method does not allow the high resolution examination of samples –
for this more technically demanding methods, using rapid freezing and sample
vitrification are required. Also, because negative staining involves deposition of
heavy atom stains, structural artefacts such as flattening of spherical or cylindrical
structures are common. Nevertheless, negative staining is a very useful technique
because of its ease and rapidity,
For bright field microscopy, negative staining is typically performed using a black
ink fluid such as nigrosin. The specimen, such as a wet bacterial culture spread on a
glass slide, is mixed with the negative stain and allowed to dry. When viewed with
the microscope the bacterial cells, and perhaps their spores, appear light against the
dark surrounding background. An alternative method has been developed using an
ordinary waterproof marking pen to deliver the negative stain.
21. ALGAL STAIN-The viability of algae belonging to divisions Cyanophyta,
Chlorophyta
and Xantophyta has been assessed by chlorophyll autofluorescence and
after staining with fluorescent dyes rodamin B, neutral rot, calcofluor white
and fluorescein diacetate. For this purpose the fluorescence of algal cells
from fresh and old cultures was scored. It was established that chlorophyll
autofluorescence could be recommended as the most convenient method for
differentiating living and dead algal cells.
22. The lactophenol cotton blue (LPCB) wet mount
preparation is the most widely used method of staining
and observing fungi and is simple to prepare. The
preparation has three components: phenol, which will
kill any live organisms; lactic acid which preserves
fungal structures, and cotton blue which stains the
chitin in the fungal cell walls.
Go to:
Procedure for corneal scrape material:
Place a drop of 70% alcohol on a microscope slide.
Immerse the specimen/material in the drop of alcohol.
Add one, or at most two drops of the lactophenol/cotton
blue mountant/stain before the alcohol dries out.
Holding the coverslip between forefinger and thumb,
touch one edge of the drop of mountant with the
coverslip edge, and lower gently, avoiding air bubbles.
The preparation is now ready for examination.
24. Serotyping – Identifying a microorganism based
on its reaction to particular antibodies. The
antibodies are used to identify microorganisms
carrying particular antigens. Techniques like the
Western blot or Enzyme Linked Immunosorbent
Assay (ELISA)
.
25. Phage typing – determines the susceptibility of a
bacterium to a particular phage type.
Highly specialized and usually restricted to the
species level and lower
Viruses that attack members of a particular bacterial
species are called bateriophages .
Phage typing is based on specificity of phage surface
receptors to cell surface receptors.
Only those bacteriophages that can attach to these
surface receptors can bind or infect bacteria and cause
lysis.
26. Flow cytometry
Easy, reliable and fast way to detect single or
multiple organisms in clinical sample
Micro –organisms are identified on the basis
of their unique cytometric parameters or by
dyes called flurochromes
Flurochromes bind to independently with
specific antibodies or oligonucleotides
Flow cytometer forms a suspension of cells
through a laser beam and measures the light
they scatter or the fluorescence they exit as
they pass through the beam
27. Species and Subspecies
Species
collection of bacterial cells which share an overall
similar pattern of traits in contrast to other bacteria
whose pattern differs significantly
Strain or variety
culture derived from a single parent that differs in
structure or metabolism from other cultures of that
species (biovars, morphovars)
Type
subspecies that can show differences in antigenic
makeup (serotype or serovar), susceptibility to bacterial
viruses (phage type) and in pathogenicity (pathotype)
28. DNA:DNA hybridization – genomic
DNA from one organisms is labeled
and hybridized with the genomic
DNA from another organism. This
technique measures the similarity
between the two DNAs. Does not
work well for comparing distantly
related microorganisms.
29. Nucleic acid base composition
•G + C content = the percent of G + C in
the DNA Can be determined by
hydrolysis of DNA and HPLC analysis
of the resulting bases or by
melting temperature (Tm)
determination
•Organisms with that differ in their G
+ C content by more than 10% are likely
to have quite different base sequences
30. •DNA chip reader
DNA chip technology has made it
possible to “print” many different
species specific probes (> 10,000) onto
a glass slide (i.e., the “chip”). Genomic
DNA is extracted from an unknown
organism and labeled with a
fluorochrome. The labeled genomic
DNA is hybridized with the probes on
the chip. Hybridization reactions
fluoresce and can be identified by
reading the DNA chip with an
instrument known as a DNA chip
31. Conclusion
Thus from initiating the simple technique of staining
to identify the microoorganisms to the complex
molecular level analysis is being carried out to confirm
the microbial species