Hagfishes are a primitive class of jawless fish called Myxini. They are classified as vertebrates despite lacking a backbone or paired appendages. Hagfishes have a cartilaginous shell that is considered the beginnings of a skull. They are primarily scavengers that consume dead fish and marine worms near the ocean floor. The slime produced by hagfishes when threatened has potential commercial uses, such as in protective clothing and armor, automobile parts, and disposable diapers due to its strength and flexibility. The skins of some hagfish species are used to produce leather goods.
It discusses basic information regarding a hemichordate animal called Balanoglossus or Acorn worm, which is also a good connecting link between the non-chordates and chordates.
Reptiles are a group (Reptilia) of tetrapod animals comprising today's turtles, ... The reptiles were, from the outset of classification, grouped with the amphibians. ... between lizards, birds, and their relatives on the one hand (Sauropsida)
It discusses basic information regarding a hemichordate animal called Balanoglossus or Acorn worm, which is also a good connecting link between the non-chordates and chordates.
Reptiles are a group (Reptilia) of tetrapod animals comprising today's turtles, ... The reptiles were, from the outset of classification, grouped with the amphibians. ... between lizards, birds, and their relatives on the one hand (Sauropsida)
The alimentary canal of Scoliodon comprises:
the mouth,
buccal cavity,
pharynx,
oesophagus,
stomach,
intestine and
rectum opening in the cloaca through anus.
All birds are in the Animalia Kingdom, Phylum of Chordata (with a backbone), and Class Aves (birds). At the Order level, the birds begin to diverge. For instance, the pelicans are in the Pelecaniformes Order while the nuthatches are in the Passeriformes Order.
This presentation provide information about salient feature of cyclostomata with proper examples and explanation why they are classified in this class.
Malpighian tubules are responsible for excretion. Glandular and ciliated cells line each tubule. They take in nitrogenous waste and convert it to uric acid, which is then expelled through the hindgut. As a result, this bug is known as uricotelic. The uricose glands and fat body nephrocytes also aid in excretion.
The invertebrates, or invertebrates, are animals that do not contain bony structures, such as the cranium and vertebrae. The simplest of all the invertebrates are the Parazoans, which include only the phylum Porifera: the sponges.
Parazoans (“beside animals”) do not display tissue-level organization, although they do have specialized cells that perform specific functions. Sponge larvae are able to swim; however, adults are non-motile and spend their life attached to a substratum.
Since water is vital to sponges for excretion, feeding, and gas exchange, their body structure facilitates the movement of water through the sponge. Structures such as canals, chambers, and cavities enable water to move through the sponge to nearly all body cells.
ppt on flight adaptation
a well prepared ppt on the topic of bird's flight adaptation.
a good collaboration of knowledge on this topic , hope all of you like this
plz like and share if you like it
The alimentary canal of Scoliodon comprises:
the mouth,
buccal cavity,
pharynx,
oesophagus,
stomach,
intestine and
rectum opening in the cloaca through anus.
All birds are in the Animalia Kingdom, Phylum of Chordata (with a backbone), and Class Aves (birds). At the Order level, the birds begin to diverge. For instance, the pelicans are in the Pelecaniformes Order while the nuthatches are in the Passeriformes Order.
This presentation provide information about salient feature of cyclostomata with proper examples and explanation why they are classified in this class.
Malpighian tubules are responsible for excretion. Glandular and ciliated cells line each tubule. They take in nitrogenous waste and convert it to uric acid, which is then expelled through the hindgut. As a result, this bug is known as uricotelic. The uricose glands and fat body nephrocytes also aid in excretion.
The invertebrates, or invertebrates, are animals that do not contain bony structures, such as the cranium and vertebrae. The simplest of all the invertebrates are the Parazoans, which include only the phylum Porifera: the sponges.
Parazoans (“beside animals”) do not display tissue-level organization, although they do have specialized cells that perform specific functions. Sponge larvae are able to swim; however, adults are non-motile and spend their life attached to a substratum.
Since water is vital to sponges for excretion, feeding, and gas exchange, their body structure facilitates the movement of water through the sponge. Structures such as canals, chambers, and cavities enable water to move through the sponge to nearly all body cells.
ppt on flight adaptation
a well prepared ppt on the topic of bird's flight adaptation.
a good collaboration of knowledge on this topic , hope all of you like this
plz like and share if you like it
Identification of Indian Major Carps,Catla catla (catla), Labeo rohita (rohu) and Cirrhinus cirrhosus (mrigal),Chinese Major carps , Grass, silver, bighead, and black carp , OTHER COMMON SPECIES OF PAKISTAN, Trout, Salmon, Tilapia
Introduction
Gnathostomata are the jawed vertebrates. (gnathos= "jaw" + (stoma)="mouth".
It comprises roughly 60,000 species. (99% of all living vertebrates).
Living gnathostomes have teeth, and paired appendages.
A horizontal semicircular canal is present in the inner ear.
Myelin sheaths is present on the neurons.
Adaptive immune system uses V(D) J recombination ( it is the mechanism of somatic recombination that occurs only in developing lymphocytes during the early stages of T and B cell maturation. VDJ recombination is the process by which T cells and B cells randomly assemble different gene segments – known as variable (V), diversity (D) and joining (J) genes – in order to generate unique receptors (known as antigen receptors) that can collectively recognize many different types of molecule. While Agnatha (petromyzon and hagfish) use genetic recombination in the variable lymphocyte receptor gene.
It is now assumed that Gnathostomata evolved from ancestors that already possessed a pair of both pectoral and pelvic fins.
In addition to this, some placoderms were shown to have a third pair of paired appendages, that had been modified to claspers in males and basal plates in females—a pattern not seen in any other vertebrate group.
It is believed that the jaws evolved from anterior gill support arches that had acquired a new role, being modified to pump water over the gills by opening and closing the mouth more effectively – the buccal pump mechanism.
Presence of Calcified, bony skull and vertebra are the characteristic features of Gnathostomata (fishes, amphibians, reptiles, birds and mammals).
Pelvic fins are situated just in front of the anus.
Interventrals and basiventrals present in the backbone. These are the elements of the backbone which lie under the notochord, and match the basidorsals and interdorsals respectively.
Gill arches which lie internally to the gills and branchial blood vessels, contrary to the gill arches of all jawless craniates, which are external to the gills and blood vessels.
A horizontal semicircular canal in the inner ear.
Paired nasal sacs which are independent from the hypophysial tube.
There are numerous other characteristics of the soft anatomy and physiology (e.g. myelinated nerve fibres, sperms passing through urinary ducts, etc.), which are unique to the gnathostomes among extant craniates, but cannot by observed in fossils.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
Delivering Micro-Credentials in Technical and Vocational Education and TrainingAG2 Design
Explore how micro-credentials are transforming Technical and Vocational Education and Training (TVET) with this comprehensive slide deck. Discover what micro-credentials are, their importance in TVET, the advantages they offer, and the insights from industry experts. Additionally, learn about the top software applications available for creating and managing micro-credentials. This presentation also includes valuable resources and a discussion on the future of these specialised certifications.
For more detailed information on delivering micro-credentials in TVET, visit this https://tvettrainer.com/delivering-micro-credentials-in-tvet/
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
This presentation was provided by Steph Pollock of The American Psychological Association’s Journals Program, and Damita Snow, of The American Society of Civil Engineers (ASCE), for the initial session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session One: 'Setting Expectations: a DEIA Primer,' was held June 6, 2024.
MATATAG CURRICULUM: ASSESSING THE READINESS OF ELEM. PUBLIC SCHOOL TEACHERS I...NelTorrente
In this research, it concludes that while the readiness of teachers in Caloocan City to implement the MATATAG Curriculum is generally positive, targeted efforts in professional development, resource distribution, support networks, and comprehensive preparation can address the existing gaps and ensure successful curriculum implementation.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
3. Subphylum : vertebrata(craniata)
Characters:Vertebrates are further
differentiated from chordates by their
vertebral column, which forms when
their notochord develops into the column
of bony vertebrae separated by discs
4. Superclass:Agnatha
Jaws are absent.
Paired fins are generally absent.
Early species had heavy bony scales and plates in
their skin, but these are not present in living
species.
In most cases the skeleton is cartilaginous.
The embryonic notochord persists in the adult.
Seven or more paired gill pouches are present.
5. Grade:Pteraspidomorphii
Pteraspidomorphs are among the earliest
known vertebrates. They were jawless and
possessed a massive dermal skeleton. They
are characterized by their dermal head
armor
6. Class:myxini
Eel-like in shape, hagfishes are scaleless,
soft-skinned creatures with paired thick
barbels on the end of the snout.
Depending on the species, they grow to
about 40 to 100 cm (16 to 40 inches) long.
Primitive vertebrates, hagfishes have a tail
fin (but no paired fins) and no jaws or
bones.
7. HAGFISH
PHYLUM:CHORDATA
SUBPHYLUM:vertebrata
CLASS:myxini
Hagfishes are the very primitive
vertebrates
Primarily scavengers they live near the
ocean floor where they consume dead
fish and marine worms.
8. Hagfishes have no paired appendage or backbone yet
they are considered as vertebrates.they have a
cartilaginous shell upon which is consider this as the
beginnings of the skull
Hagfishes has no jaws their tongue has two rows of
rasp-like structure that enables them to scrape at
their food
a row of sensory tentacles surround the hagfish’s
mouth
9. These fishes are called “knot fish” because they are
able to tie themselves into knots.
They do this to rid their skin of excess slime and to
gain leverage so they can enter into the anus of the
dead fish upon which the scavenger.
10. Myxiniformes characters:
All hagfish species have a cartilaginous skeleton with no
vertebrae, true fin rays, paired fins, or scales.
Body eel like,
Hagfishes lack jaws, but have two laterally biting dental
plates with keratinous cusps.
The mouth is an oval slit, with four fleshy barbels, and a
strong tooth on the tongue.
11. Myxinidae characters:
• Degenerate eyes.
• Laterally biting mouth bearing barbels.
• Teeth only on tongue plus one on 'palate'.
• Mucous pores in 2 ventrolateral lines, each line with about 70-
200 glands containing mucous cells and thread cells.
12. Myxine glutinosa
Kingdom : animalia
Phylum : chordata
Class : myxini
Order : myxiniformes
Family : myxinidae
genus : myxine
Species : Myxine glutinosa
13. Myxine character :
analfin ending posterior to branchial aperture.
5 to 7 pair of gill pouches.
M.glutinosa character:
jawless mouth
No operculum or covering fold of the skin.
Greyish or reddish brown above
14. Eptatretus stoutii (pacific hagfish)
Kingdom : animalia
Phylum : chordata
Class : myxini
Order : myxiniformes
Family : myxinidae
genus : Eptetretus
Species : E.stoutii
15. Eptatretus character:
No dorsal fin and anal fin
One dorsal finfold
Caudal fin braoad and rounded
Ventral finfold very low origin posterior to last gill pore.
E.Stoutii character:
dark brown,tan ,grey,tinted with blue or purple and never
black.
Rarely with large patches of white.
16. E. cirrhatus (broadgilled hagfish)
Kingdom: Animalia
Phylum: Chordata
Class: Myxini
Order: Myxiniformes
Family: Myxinidae
Genus: Eptatretus
Species: E. cirrhatus
17. E. deani(Black hagfish)
Kingdom: Animalia
Phylum: Chordata
Class: Myxini
Order: Myxiniformes
Family: Myxinidae
Genus: Eptatretus
Species: E. deani
18. E. hexatrema(sixgill hagfish)
Kingdom: Animalia
Phylum: Chordata
Class: Myxini
Order: Myxiniformes
Family: Myxinidae
Genus: Eptatretus
Species: E. hexatrema
19. Economic importance of hagfishes
AS FOOD:
Hagfishes are not eaten often however the inshore
hagfish found in the northwest pacific is eaten in japan
The hagfish is valued as food in korea.
SKINS:
Hagfish skin is used in variety of clothing accessories is
usually referred to as eel skin . It produces a particular
durable leather especially suitable for wallets and
belts.
20. HAGFISH SLIME:
When hagfish is threatened it produces a
proten based gelly like slime called mucus.
These mucus are threadlike similar to the
spider silk.
These are in bundles called skeins.
Skeins are tiiner than human hair and
stronger than nylon.
21. USES OF SLIME:
Because of the strength,flexibility,and rapid expansion these are
use very potentially.
These slime are used in protective gear such as safety helmet
and Kevlar vests.
In automobile industry the slime is used in airbags or to add
lightweight strength and flexibility to the car parts.
The fabric made from the slime could replace petroleum based
materials and this fabric is eco-friendly.
they can be used to create hydrogels that could be used to
make disposable diapers.
Us navy is currently working withbthis slime to create substance
to protect sea divers ans fight fires and even to stop missles