economic importance of gymnosperms.Gymnosperms are simple and primitive seed-bearing plants without flowers.
The plant body is sporophytic and is differentiated into root,stem and leaves.
All gymnosperms are usually wind-pollinated.
Leaves have thick cuticle and sunken stomata.
Gymnosperms are heterosporous.magasporangia and microsporangia occur on mega and microsporophylls respectively.
economic importance of gymnosperms.Gymnosperms are simple and primitive seed-bearing plants without flowers.
The plant body is sporophytic and is differentiated into root,stem and leaves.
All gymnosperms are usually wind-pollinated.
Leaves have thick cuticle and sunken stomata.
Gymnosperms are heterosporous.magasporangia and microsporangia occur on mega and microsporophylls respectively.
The slides has been edited. visit for new one on https://www.slideshare.net/alihaider408/stelar-system-stele-its-types-and-evolutionedited-182037813
Sorry for inconvenience.
Stele is defined as a central vascular cylinder, with or without pith and delimited the cortex by endodermis.
Van Tieghem and Douliot (1886) recognized only three types of steles.
1-Protostele
2-Siphonostele
3-Solenostele
Stelar Theory:
Major highlights of stellar theory are:
Stele is a real entity and present universally in all higher plants.
Cortex and stele are two fundamental parts of a shoot system
Stele and cortex are separated by endodermis
This lecture is about classification of algae. In this presentation outline of Fritsch's and Smith's classifications are given. Helpful for B. Sc. students.
Phylum Bacillariophyta, Xanthophyta & Chrysophyta Fasama H. Kollie
Bacillariophyta is a phylum of the kingdom Protista, consisting of mostly unicellular aquatic algae commonly referred to as Diatoms.
Xanthophytes are the yellow-green algae whereas Chrysophytes are the golden-brown algae.
The genus Coleochaete is represented by about 10 species, out of which 3 species are found in India. They grow in fresh water either as epiphytes on different angiosperms. They show much variation in their heterotrichous nature. Due to well-developed prostrate system, it forms discoid thailus and looks like
pseudo- parenchyma of one cell in thickness.
The slides has been edited. visit for new one on https://www.slideshare.net/alihaider408/stelar-system-stele-its-types-and-evolutionedited-182037813
Sorry for inconvenience.
Stele is defined as a central vascular cylinder, with or without pith and delimited the cortex by endodermis.
Van Tieghem and Douliot (1886) recognized only three types of steles.
1-Protostele
2-Siphonostele
3-Solenostele
Stelar Theory:
Major highlights of stellar theory are:
Stele is a real entity and present universally in all higher plants.
Cortex and stele are two fundamental parts of a shoot system
Stele and cortex are separated by endodermis
This lecture is about classification of algae. In this presentation outline of Fritsch's and Smith's classifications are given. Helpful for B. Sc. students.
Phylum Bacillariophyta, Xanthophyta & Chrysophyta Fasama H. Kollie
Bacillariophyta is a phylum of the kingdom Protista, consisting of mostly unicellular aquatic algae commonly referred to as Diatoms.
Xanthophytes are the yellow-green algae whereas Chrysophytes are the golden-brown algae.
The genus Coleochaete is represented by about 10 species, out of which 3 species are found in India. They grow in fresh water either as epiphytes on different angiosperms. They show much variation in their heterotrichous nature. Due to well-developed prostrate system, it forms discoid thailus and looks like
pseudo- parenchyma of one cell in thickness.
I. OBJECTIVES OF PRESERVATION
In this guideline, we are mainly concerned with the taxonomic reasons for preservation. The scientific description of an animal species requires the detailed examination and description of a representative type specimen and a series of specimens which are subsequently deposited, catalogued and maintained in a museum or zoological collection. This remains a reference for other workers to consult in future.
Specimens from any field collection should be deposited in a reference collection in an institutional for the long-term maintenance and access for the future. The animals should therefore be preserved in the best possible condition and where possible, ensure that the natural colour is retained, their external appendages (e.g. fins) are erected and stomach contents intact.
Care should be taken to ensure that specimens are undamaged. Features important in the taxonomic study of fish, for example, are easily damaged with contact even after preservation. Live crabs before preservation should be kept individually as some species will damage each other and other animals, especially fish even when they are being directly preserved.
The Most Precious and Important Survival ResourceBob Mayer
Water for Living and Survival. What You Need To Know. Drinkable Water is almost always your #1 survival priority. How much do you need? How much should you have on hand? How can you purify water? What gear should you get?
A brief presentation about the preservation and conservation of the organisms, big and small and how to submit them in the biological museum.
This is specific to the animals only.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
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.
(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.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
The increased availability of biomedical data, particularly in the public domain, offers the opportunity to better understand human health and to develop effective therapeutics for a wide range of unmet medical needs. However, data scientists remain stymied by the fact that data remain hard to find and to productively reuse because data and their metadata i) are wholly inaccessible, ii) are in non-standard or incompatible representations, iii) do not conform to community standards, and iv) have unclear or highly restricted terms and conditions that preclude legitimate reuse. These limitations require a rethink on data can be made machine and AI-ready - the key motivation behind the FAIR Guiding Principles. Concurrently, while recent efforts have explored the use of deep learning to fuse disparate data into predictive models for a wide range of biomedical applications, these models often fail even when the correct answer is already known, and fail to explain individual predictions in terms that data scientists can appreciate. These limitations suggest that new methods to produce practical artificial intelligence are still needed.
In this talk, I will discuss our work in (1) building an integrative knowledge infrastructure to prepare FAIR and "AI-ready" data and services along with (2) neurosymbolic AI methods to improve the quality of predictions and to generate plausible explanations. Attention is given to standards, platforms, and methods to wrangle knowledge into simple, but effective semantic and latent representations, and to make these available into standards-compliant and discoverable interfaces that can be used in model building, validation, and explanation. Our work, and those of others in the field, creates a baseline for building trustworthy and easy to deploy AI models in biomedicine.
Bio
Dr. Michel Dumontier is the Distinguished Professor of Data Science at Maastricht University, founder and executive director of the Institute of Data Science, and co-founder of the FAIR (Findable, Accessible, Interoperable and Reusable) data principles. His research explores socio-technological approaches for responsible discovery science, which includes collaborative multi-modal knowledge graphs, privacy-preserving distributed data mining, and AI methods for drug discovery and personalized medicine. His work is supported through the Dutch National Research Agenda, the Netherlands Organisation for Scientific Research, Horizon Europe, the European Open Science Cloud, the US National Institutes of Health, and a Marie-Curie Innovative Training Network. He is the editor-in-chief for the journal Data Science and is internationally recognized for his contributions in bioinformatics, biomedical informatics, and semantic technologies including ontologies and linked data.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
2. Preservation of algae
General method
Liquid preservation
Commercial Formalin
Lugol’s solution
Dried herbarium specimens
Preservation of algae
2
3. Introduction
Algae can be stored initially in a bucket, jar, bottle or
plastic bag, with some water from the collecting site.
The container should be left open or only half filled with
liquid and wide shallow containers are better than narrow
deep jars.
Note that glass is reportedly not satisfactory for some
Chrysophyta and other algae of acidic waters due to its
inherent alkalinity damaging cells.
However, glass phials are commonly used to collect algae.
If refrigerated or kept on ice soon after collecting most
algae can be kept alive for short periods (a day or two).
Algae can be stored initially in a bucket, jar, bottle or
plastic bag, with some water from the collecting site.
The container should be left open or only half filled with
liquid and wide shallow containers are better than narrow
Note that glass is reportedly not satisfactory for some
and other algae of acidic waters due to its
However, glass phials are commonly used to collect algae.
If refrigerated or kept on ice soon after collecting most
algae can be kept alive for short periods (a day or two).
3
4. If relatively sparse in sample, some algae can continue to
grow in an open dish stored in a cool place with reduced
light.
For long term storage, specimens can be preserved in
liquid, dried, or made into a permanent microscope
mount.mount.
Even with ideal preservation, examination of fresh
material is sometimes essential for an accurate
determination.
Motile algae particularly must be examined while flagella
and other delicate structures remain intact.
If relatively sparse in sample, some algae can continue to
grow in an open dish stored in a cool place with reduced
For long term storage, specimens can be preserved in
liquid, dried, or made into a permanent microscope
Even with ideal preservation, examination of fresh
material is sometimes essential for an accurate
Motile algae particularly must be examined while flagella
and other delicate structures remain intact.
4
5. Liquid preservation
Commercial formalin (which is a solution of 40% formaldehyde),
diluted between 1/10 and 1/20 with the collecting solution, is the most
commonly used fixative.
Note that formaldehyde is thought to be carcinogenic and all contact with
skin, eyes and air passages should be avoided.
FAA (by volume, 40% formaldehyde 1: glacial acetic acid 1: 95% alcohol 8:
water 10) or 6-3-1 (by volume, water 6:90% alcohol 3: 40% formaldehyde 1)
solutions give better preservation results for some of more fragile algae,
whereas the standard alcohol and water mix will ruin the larger algae.
Algae can be kept in diluted formalin for a number of years, but the solution
is usually replaced by 70% ethyl alcohol with 5% glycerine.
(which is a solution of 40% formaldehyde),
diluted between 1/10 and 1/20 with the collecting solution, is the most
Note that formaldehyde is thought to be carcinogenic and all contact with
FAA (by volume, 40% formaldehyde 1: glacial acetic acid 1: 95% alcohol 8:
1 (by volume, water 6:90% alcohol 3: 40% formaldehyde 1)
solutions give better preservation results for some of more fragile algae,
whereas the standard alcohol and water mix will ruin the larger algae.
Algae can be kept in diluted formalin for a number of years, but the solution
is usually replaced by 70% ethyl alcohol with 5% glycerine.
5
6. Lugol’s solution is commonly used for short term (e.g. a few months,
but possibly a year or more) storage of microalgae.
Dissolve one gram of iodine crystals and two grams potassium iodine in 300 ml
of water.of water.
Use three drops of this solution in a 100 ml sample (it should look like very
weak tea).
is commonly used for short term (e.g. a few months,
year or more) storage of microalgae.
Dissolve one gram of iodine crystals and two grams potassium iodine in 300 ml
Use three drops of this solution in a 100 ml sample (it should look like very
6
7. Dried herbarium specimens
Dried herbarium specimens can be prepared by ‘floating out’ similar
to aquatic flowering plants.
Ideally, fresh specimens should be fixed prior to drying. Most algae
will adhere to absorbent herbarium paper.
Smaller, more fragile specimens or tangled, matSmaller, more fragile specimens or tangled, mat
dried onto mica or cellophane.
After ‘floating out’, most freshwater algae should not be pressed but
simply left to air in a warm dry room.
Dried herbarium specimens
Dried herbarium specimens can be prepared by ‘floating out’ similar
Ideally, fresh specimens should be fixed prior to drying. Most algae
Smaller, more fragile specimens or tangled, mat-forming algae maySmaller, more fragile specimens or tangled, mat-forming algae may
After ‘floating out’, most freshwater algae should not be pressed but
7
8. If pressed, they should be covered with a pieces of waxed paper,
plastic or muslin cloth so that the specimen does not stick to the
drying paper inn the press.
To examine a dried herbarium specimen add a few drops of water to To examine a dried herbarium specimen add a few drops of water to
specimen.
After a minute or so the specimen will swell and lift slightly from the
paper.
Carefully remove a small portion of the specimen with forceps or a
razor-blade.
If pressed, they should be covered with a pieces of waxed paper,
plastic or muslin cloth so that the specimen does not stick to the
To examine a dried herbarium specimen add a few drops of water toTo examine a dried herbarium specimen add a few drops of water to
After a minute or so the specimen will swell and lift slightly from the
Carefully remove a small portion of the specimen with forceps or a
8
10. EDTA =
Dissolve 5 g of ethylene diamine tetra-acetic acid and 31 g potassium hydroxide
(KOH) in one litre of distilled water.
Iron solution =
Dissolve 4.98 g of iron sulfate heptahydrate (FeSO4
water prepared by adding 1 ml of sulfuric acid in 999 ml of distilled water.
Solution of boron Solution of boron =
Dissolve 11.42 g of boric acid (H3BO3) in one litre of distilled water.
Microelements
acetic acid and 31 g potassium hydroxide
7H20) in one litre of acidified
water prepared by adding 1 ml of sulfuric acid in 999 ml of distilled water.
) in one litre of distilled water.
10