This document discusses different types of biological interactions between species: mutualism, amensalism, commensalism, and parasitism. It provides examples for each type of interaction. Mutualism benefits both species, such as the relationship between plants and mycorrhizal fungi. Amensalism harms one species without affecting the other, like competition between trees and saplings. Commensalism benefits one species without affecting the other, exemplified by phoretic mites on insects. Parasitism benefits one species at the expense of the other, illustrated by tapeworms living in mammalian guts.
Predation: What would happen to all the energy fixed by
autotrophic organisms if the community has no animals to eat the
plants? You can think of predation as nature’s way of transferring
to higher trophic levels the energy fixed by plants. When we think
of predator and prey, most probably it is the tiger and the deer that
readily come to our mind, but a sparrow eating any seed is no less
a predator. Although animals eating plants are categorised
separately as herbivores
What is Population interaction and 9 types of population interaction amongst Species including predation,protocooperation, mutualism, commensalism, ammensalism,parasitism,neutralism,and competition for resources.
Predation: What would happen to all the energy fixed by
autotrophic organisms if the community has no animals to eat the
plants? You can think of predation as nature’s way of transferring
to higher trophic levels the energy fixed by plants. When we think
of predator and prey, most probably it is the tiger and the deer that
readily come to our mind, but a sparrow eating any seed is no less
a predator. Although animals eating plants are categorised
separately as herbivores
What is Population interaction and 9 types of population interaction amongst Species including predation,protocooperation, mutualism, commensalism, ammensalism,parasitism,neutralism,and competition for resources.
Mushrooms - intro classification and productionDIVYA BHARDWAJ
identification of mushrooms
structure of mushrooms
human use
fungi culture
techniques used for mushroom culture
steps in culturing
composting
spawning
casing
pinning
harvesting
cultivation of paddy straw mushroom
Biodiversity action plan for Pakistan.pptxAdnan Tariq
Biodiversity action plane for Pakistan
Key issues
Major threats to biodiversity
Government institutional arrangements
Protect area
Legislation
Threatened ecosystems in Pakistan
Development of BAP
Objectives
Ecological Interactions - Mutualism, Commensalism & NeutralismRahul M. Prathap
Ecological interactions are the effects an organism have on another in an ecosystem. This slide describes Mutualism, Commensalism and Neutralism with examples.
Mushrooms - intro classification and productionDIVYA BHARDWAJ
identification of mushrooms
structure of mushrooms
human use
fungi culture
techniques used for mushroom culture
steps in culturing
composting
spawning
casing
pinning
harvesting
cultivation of paddy straw mushroom
Biodiversity action plan for Pakistan.pptxAdnan Tariq
Biodiversity action plane for Pakistan
Key issues
Major threats to biodiversity
Government institutional arrangements
Protect area
Legislation
Threatened ecosystems in Pakistan
Development of BAP
Objectives
Ecological Interactions - Mutualism, Commensalism & NeutralismRahul M. Prathap
Ecological interactions are the effects an organism have on another in an ecosystem. This slide describes Mutualism, Commensalism and Neutralism with examples.
Ecological interactions form the backbone of an ecosystem. It helps in maintaining the
dynamic equilibrium of an ecosystem. All organisms are linked to at least one other species in a
variety of critical ways, for example, as predators or prey, or as pollinators or seed dispersers with the
result that each species is embedded in a complex network of interactions. Consequently, the
extinction of one species can lead to a cascade of secondary extinctions in ecological networks.
Moreover, interactions between species can lead to ‘community closure’ after the loss of a species,
with the result that a locally extinct species cannot re-establish itself if it is reintroduced. Many
ecological interactions involve flagship species and keystone species as in the case of Macaca
silenus & Cullenia exarillata. Then some interactions like mycorrhiza help in nitrogen fixation.
Strategies like predation reduce the loss of vegetation through grazing. Interaction can be either intraspecific or interspecific. Interactions between individuals of the same species
and those between individuals of different species are called intra- & interspecific interactions.
respectively. The lichen serves as an example of interspecific interaction and dog fighting.
for a common prey for intraspecific interaction.
Mutualism describes an interaction that benefits both species. A well-known example exists in the mutualistic relationship between alga and fungus that form lichens. The photosynthesizing alga supplies the fungus with nutrients and gains protection in return. The relationship also allows lichen to colonize habitats inhospitable to either organism alone. In rare cases, mutualistic partners cheat. Some bees and birds receive food rewards without providing pollination services in exchange. These "nectar robbers" chew a hole at the base of the flower and miss contact with the reproductive structures.
Both species involved in the interaction are benefited. These interactions take place in three patterns:
Facultative mutualism – Species survive on their own under favorable conditions
Obligate mutualism – One species is dependent for survival on the other
Diffusive mutualism – One entity can live with multiple partners
These relationships have three purposes:
Defensive mutualism
Trophic mutualism
Dispersive mutualism
Biotic factors also regulate the size of populations more intensely. Finally, the influence of biotic interactions can occur at two different levels. Interspecific effects are direct interactions between species, and the intraspecific effects represent interactions of individuals within a single species.
Community
all the organisms that live together in a place
Community Ecology
study of interactions among all -populations in a common environment
In what ways do populations interact?
Community – all the organisms that live together in one place
Community ecology – study of interactions among all populations in a common environment.
Interspecific interactions – among individuals of the different species.
Intraspecific interactions – among individuals of the same species.
Species Interaction…
-A traditional approach to population interactions has been to consider the direct pair-wise interactions.
Community Ecology is the study of interactions among all populations in a common environment.
Species Interaction is a traditional approach to population interactions has been to consider the direct pair wise interactions.
Two populations may or may not affect each other; if they do, the influence may be beneficial or adverse
Types of Population Relationships:
Interspecific interactions:
Competition and Coexistence
Predation
Mutualism
Commensalism
Intraspecific Interactions
Grasshoppers provide an animal example. Individual grasshoppers deprive their fellow conspecifics of food (exploitation competition).
It is probably a major factor involved in the evolution of plumage patterns in birds.
during intraspecific competition, animals will use whatever weapons are available to them and this makes it likely that the nature of the weapons determines the nature and location of patterns.
INTERACTIONS :Interaction is relationship between two organisms.
Also called as BIOLOGICAL OR ECOLOGICAL INTERACTIONS.
In a ecosystem, living (biotic) things have to interact with one another as well as with non -living components of their environment.
All the vital process of living such as growth, nutrition & reproduction requires such interactions between individuals in same species or between species.
The interaction between organisms may not be always beneficial to all the interacting counter parts. Based on whether, the interaction is beneficial to both interacting species or harmful to at least one interaction species, the ecological of biological interactions are classified into two categories.
It can BENEFIT an organisms
It can HARM an organisms
It can NO EFFECT an organisms
POSTIVE INTERACTIONS
In positive interactions, the interacting populations help one another.
The positive interaction may be in one way or reciprocal.
The benefit may be in respect of food, shelter, substratum or transportation.
The positive association may be continuous, transitory, obligate or facultative.
The two interacting partners may be in close contact in such a way that the tissues intermixed with each other; or they may live within a specific area of the other; or attached to its surface.
NEGATIVE INTERACTIONS
In negative interactions, one of the interacting populations is benefited and the other is harmed.
In negative interaction one population may eat members of the other population, compete for foods or excrete harmful wasters.
SYMBIOTIC RELATIONSHIP
Such relationship between living organisms when they live in close association of each other is called as SYMBIOTIC RELATIONSHIP
Mutualism, also called as symbiosis, is also a positive type of ecological interaction.
Mutualism is a symbiotic association between two organisms in which both the interacting partners are mutually benefitted.
Mutualism is different from proto-cooperation in the sense that mutualism is obligatory and none of the partners of mutualism can survive individually.
In mutualism, the organisms enter into some sort of physical and physiological exchange
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
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.
This pdf is about the Schizophrenia.
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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.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
3. MUTUALISM is the way
two organisms of different spe
cies exist in a relationship in
which each individual benefits
from the activity of the other.
Mutualistic interactions are
vital for
terrestrial ecosystems as more
than 48% of land plants rely
on mycorrhizal relationships
with fungi to provide them
with inorganic compounds and
trace elements.
Mycorrhizal association is an
example for mutualism
4. Types of relationships
Service-resource relationships
Pollination in which nectar or pollen (food
resources) are traded for pollen dispersal (a
service) or ant protection of aphids, where the
aphids trade sugar-rich honeydew in return for
defense against predators such as ladybugs.
Service-service relationships
In the relationship between sea
anemones and anemone fish, the anemones
provide the fish with protection from predators
and the fish defend the anemones
against butterflyfish, which eat anemones.
Humans
Humans are involved in mutualism with
other species. Their gut flora is essential for
efficient digestion.
Some relationships between humans
and domesticated animals and plants are to
different degrees of mutualism. For example,
agricultural varieties of maize provide food for
humans and are unable to reproduce without
human intervention because the leafy sheath does
not fall open, and the seed head does not shatter
to scatter the seeds naturally.
Pollination (service – resource)
Sea anemone and anemone
fish (service – service)
5. Amensalism is the type of relationship that exists
where one species is inhibited or completely
obliterated and one is unaffected by the other.
There are two types of Amensalism; competition
and antibiosis.
Competition is where a larger or stronger organism
deprives a smaller or weaker one from a resource.
Antibiosis occurs when one organism is damaged or
killed by another through a chemical secretion.
6. Competition: A sapling growing
under the shadow of a mature tree:
The mature tree can rob the
sapling of necessary sunlight and,
if the mature tree is very large, it
can take up rainwater and deplete
soil nutrients.
Throughout the process, the
mature tree is unaffected by the
sapling. Indeed, if the sapling
dies, the mature tree gains
nutrients from the decaying
sapling.
Antibiosis: Juglans nigra (black
walnut), secretes juglone, a
substance which destroys many
herbaceous plants within its root
zone.
Competition between trees and saplings
Antibiosis in Black walnut
7. In commensalism, one organism benefits from the
relationship while the other species involved neither
benefits nor is harmed.
The unharmed organism is unaware of what is
happening, or chooses to ignore it.
The organism benefitting is often gaining food or
shelter.
The benefits for one organism can be in a variety of
forms, including food, shelter, transportation and
seed dispersal.
8. Commensalisms vary in strength and duration from
intimate, long - lived symbioses to brief, weak
interactions through intermediaries.
Phoresy
Phoresy is one animal attached to
another exclusively for transport,
mainly arthropods, examples of which
are mites on insects (such
as beetles, flies or bees), millipedes on birds,
etc.
Inquilinism
Inquilinism is the use of a second
organism for permanent housing. Examples
are epiphytic plants (such as many orchids)
that grow on trees, or birds that live in holes
in trees.
Metabiosis
Metabiosis is a more indirect
dependency, in which one organism creates or
prepares a suitable environment for a second.
Examples include maggots, which feast and
develop on corpses; and hermit crabs, which
use gastropod shells to protect their bodies.
Phoretic mites on Sexton beetle
Inquilinism in birds
Hermit crab
9. Parasitism is a non-mutual relationship
between species, where one species, the parasite,
benefits at the expense of the other, the host.
Parasites typically do not kill their host, are
generally much smaller than their host, and often
live in or on their host for an extended period.
10. Parasites reduce hosts’ biological
fitness by general or
specialized pathology, from impairment
of secondary sex characteristics, to the
modification of host behavior.
Parasites increase their own fitness by
exploiting hosts for resources necessary
for their survival, in
particular transmission.
Although parasitism often applies
unambiguously, it is part of a continuum
of types of interactions between species,
grading via parasitoidy into predation.
Examples include interactions
between vertebrate hosts
and tapeworms, flukes,
the Plasmodium species, and fleas.
Tapeworm in mammalian gut
Broodal parasitism