[SAM]BETAU 2012

Beryllium…

an element…

a section….

but most importantly..

our home…

haha, pero SAMPA room pa rin… 

SAMPA. Sorry gd kung damo na gd balayran ta this week pero short na gd ko sa kwarta. So… Please lang.

Kagina, nagbakal Mom ko gamit money ko (tabon lng anay) sng tela para sa stage ta para sa el Fili. Nakasulat sa board kagina na P1280 ang balayran. Pero may gndugang pa gali so P1350 na sya.

Ang kwarta nga gn collect ni Gabin chakto pa lng to sa balloons ta para sa stage.

So kelangan nyo ko bayran P45 each. Deadline on Friday. Maluoy kamo. Wala na gd ko kwarta. T_T

Dont worry. Taguon ko ang tela para magamit ta anytime. :)

Please and Thank you.

Good luck saton sa Foodfest kg El Fili!

The current user of this account is posting silly stuff and should not be taken seriously… Hi Pipz.. The post earlier is just playing stupid.. no hard feelings..

Nematodes žž

The “nematodes or “roundworms” (Phylum Nematoda) are the most diverse phylum of pseudocoelomates , and one of the most diverse of all animals.

žHABITAT

They are ubiquitous in freshwater, marine and terrestrial environments.

ž

žSystematics and Phylogeny

žPhylum Nematoda

• Basal Order Monhysterida

žPhysical Structures

• Slender worm-like animals, typically less than 2.5mm. (smallest are microscopic, while others grow more than 5cm)

žDigestive System

• The mouth often includes a hollow and sharp stylet that can be used to suck liquids from plants and animals

žExcretory System ž

• Nitrogenous waste is excreted in the form of ammonia through the body walls.

žNervous system ž

• Four nerves run the length of the body on the dorsal, ventral, and lateral surfaces.
• Each lies within a cord of connective tissue lying beneath the cuticle and between the muscle cells. ž
• The ventral nerve is the largest, and has a double structure forward of the excretory pore. ž
• The dorsal nerve is responsible for motor control, while the lateral nerves are sensory, and the ventral combines both functions.
• žAt the anterior end of the animal, the nerves branch from a dense circular nerve ring surrounding the pharynx, and serving as the brain. ž
• Smaller nerves run forward from the ring to supply the sensory organs of the head.the body is covered with numerous number of bristles and papillae that together provides a sense of touch.
• žBehind the sensory bristles on the head lie two small pits, or amphids.
• žAmphids are well supplied with nerve cells and are probably chemoreception organs.

žReproduction

žMost species are dioecious, with separate male and female individuals. žBoth sexes possess one or two tubular gonads. žIn males, sperm is produced at the end of the gonad and migrates along its length as it mature.ž

žThe testes each open into a relatively wide sperm duct and then into a glandular and muscular ejaculatory duct associated with the cloaca. In females, the ovaries each open into an oviduct and then a glandular uterus. The uteri both open into a common vagina, usually located in the middle of the ventral surface. žReproduction is usually sexual. Males are usually smaller than females (often much smaller).ž

žNematode sperm is thought to be the only eukaryotic cell without the globular protein G-actin. žEggs may be embryonated or unembryonated when passed by the female, meaning that their fertilized eggs may not yet be developed. A few species are known to be ovoviviparous. The eggs are protected by an outer shell, secreted by the uterus. In free-living roundworms, the eggs hatch into larva, which appear essentially identical to the adults, except for an under-developed reproductive system; in parasitic roundworms, the life cycle is often much more complicated.ž

žSome nematodes, such as Heterorhabditis spp., undergo a process called endotokia matricida: intrauterine birth causing maternal death.Some nematodes are hermaphroditic, and keep their self-fertilized eggs inside the uterus until they hatch. The juvenile nematodes will then ingest the parent nematode. This process is significantly promoted in environments with a low or reducing food supply. ž

Free-living species

• žUsually consists of four molts of cuticle during growth
• žDifferent species feed on materials as varied as algae, fungi, small animals, fecal matter, dead organisms and living tissues.
• Free-living marine nematodes are important and abundant members of the meiobenthos ž
• They play an important role in the decomposition process, aid in recycling of nutrients in marine environments and are sensitive to changes in the environment caused by pollution.

žParasitic Species

žNematodes commonly parasitic on humans include ascarids (Ascaris), filarids, hookworms, pinworms (Enterobius) and whipworms (Trichuris trichiura).

• žThe species Trichinella spiralis, commonly known as the trichina worm, occurs in rats, pigs, and humans, and is responsible for the disease trichinosis.
• ž Baylisascaris usually infests wild animals but can be deadly to humans as well.

• žOne form of nematode is entirely dependent upon fig wasps, which are the sole source of fig fertilization.
• They prey upon the wasps, riding them from the ripe fig of the wasp’s birth to the fig flower of its death, where they kill the wasp, and their offspring await the birth of the next generation of wasps as the fig ripens.
• žPlant parasitic nematodes include several groups causing severe crop losses.

ž

žThe most common genera are Aphelenchoides (foliar nematodes), Ditylenchus, Globodera (potato cyst nematodes), etc. žSeveral phytoparasitic nematode species cause histological damages to roots, including the formation of visible galls (e.g. by root-knot nematodes), which are useful characters for their diagnostic in the field. žOther nematodes attack bark and forest trees. The most important representative of this group is Bursaphelenchus xylophilus, the pine wood nematode, present in Asia and America and recently discovered in Europe.

Here are the assignments for tomorrow:

A. Chemistry 1

1. Quiz on Chemical Bonding -> Lewis Structure

*Practice. Practice. Practice.

B. Mathematics 3

1. Long Test 1

*Absolute Value Functions

*Quadratic Functions

C. Computer Science 2

1. Laboratory Exercise

D. Filipino

1. Graded Recitation on Pagbabagong Morpoponemiko

TANI MAY FILIPINO NA BWAS after 1 week nga wala filipino. :D

Guys, sorry for the very late post.

Promise. Try ko gid mag post everyday next week.

1. Biology 1

a. Laboratory Activity on Investigating Animal Behavior

b. Quiz on Cnidaria and Platyhelminthes

2. Social Science 2

a. Quiz on the last meeting’s lesson

3. Chemistry 1

a. Quiz on Oxidation State

4. Mathematics 3

a. Assignment on Coordinate Geometry

5. Filipino

a. Talagang magququiz tayo sa PAGBABAGONG MORPOPONEMIKO

Other concerns

1. HEALTH - Submit a written report (format the same as 3rd q project’s format) on Thursday.

2. BIOLOGY - Upcoming Reports for this week : Nematoda, Annelida, Molluska + Arthropoda

1 earthworm

shoebox

cardboard folder

scotch tape

colored paper

tissue

cup of sand

cup of soil

water

• 1. Physical Education 2

• Practical Test on Waltz

2. English 2

• Reporting for those who are chosen

3. Chemistry 1

• Quiz on Valence Electrons

*GOOD LUCK BWAS.

“You burn me!”