
I am always confused about te fielding positions in cricket and am not able to follow the commentary or where the ball is going. Let me try with this diagram to understand.
The blog is mainly a general knowledge page for all age groups who are interested in improving their knowledge. I have tried to make the explanations as simple as I can. I have made use of tht for gathering the facts.
Meet India's miracle baby | |||||||
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The infant, said to be the baby with the lowest birth weight to survive in the country, was born premature at 27 weeks of pregnancy on October 2. She had to be kept in neo-natal care for 90 days. Doctors waited until the baby reached a "safe survival period" and reported the incident only after it had attained a weight of 2.4 kg. A team of senior hospital doctors led by Dr Avinash Phadnis, director of obstetrics and gynaecology, and neo-natologist Dr Tushar Parikh have been involved in taking care of the baby so far. Doctors said the girl, who is yet to be named, was born to Narayangaon resident Shaila Pawar (36), who had a bad obstetric history. This was Pawar's 14th pregnancy. The previous 13 pregnancies were unsuccessful, with three abortions and three intra-uterine deaths. "She went to a doctor couple in Narayangaon, who realised that she might have hypertension related complications and referred her case to us when she was six months pregnant. She was put under the care of Dr Avinash Phadnis and put on anti-hypertensive pills to keep the blood pressure in control," said senior obstretician Dr Neena Sathe. A few days later Pawar had sudden elevation in blood pressure at home and she was rushed to Oyster and Pearl Tulip by her gynaecologist, where doctors decided to do an emergency caesarean after looking at her condition. "Pawar's baby was born premature, weighing just 495 grams at birth. The baby required artificial breathing support to regularise her breathing and then she was quickly transferred to the neo-natal ICU," said Dr Tushar Parikh. "To salvage the life of such a small baby was challenging as there were no reports of a baby weighing so little surviving in India." The doctor said the last reported smallest survival was a baby weighing 540 grams. According to doctors, babies born this small have extremely poor function of all body organs, including the lungs, heart, brain, kidneys, intestine, skin and adrenals. All of these organs need support for the survival of the child. The baby stayed in the neo-natal ICU for almost 90 days and when discharged, its weight was close to 1,400 grams. "We could have reported this case much earlier, but we wanted to ensure that the baby continues to grow normally and remains healthy after discharge. Now the baby is four-month-old and her weight is 2.4 kg," |
The nucleus houses the majority of genetic material of a cell. The nucleus is the “brain” of the cell and controls all activity within the cell. Using DNA as a blueprint(like the blueprints of a city) the nucleus directs the production of proteins. You will learn about this process in the DNA Transcription and Translation lab.![]()
A nucleus with the DNA coiled into chromatin. Electron microscope picture of a nucleus
The ribosomes carry out manual labor in the form of protein synthesis for the nucleus. They bring together all the raw ingredients such as RNA (copies of the original DNA blueprints) and amino acids to assemble proteins. The proteins created are essential to cell and organismal function. Think of proteins as machinery for cell functions much like electricity and plumbing are essential in a real city. For example, enzymes are a type of protein without which life could not exist.
The large and small subunits of ribosomal RNA translating an mRNA strand into a polypeptide chain.
Refer to DNA Transcription and Translation for further reading.
There are two types of endoplasmic reticulum (ER) – Smooth ER and Rough ER. This extensive network makes up approximately one half of all membranous tissue of the cell and is the site of membrane and protein synthesis. The ER system is much like a road system along which industry can be found. Goods are manufactured and shipped to needed areas via the road system. Rough ER is named for the presence of ribosomes along its membrane and is the source of proteins. Smooth ER lacks ribosomes and is responsible for lipid synthesis and processes a variety of metabolic processes such as drug detoxification.
Can you tell the difference between the smooth and rough ER?
Cell membranes are found in animal cells whereas cell walls are found in plant cells. Cell walls and membranes have similar functions. Like a city perimeter, cell membranes surround the cell and have the ability to regulate entrance and exit of substances, thereby maintaining internal balance. These membranes also protect the inner cell from outside forces. Cell walls, as the city analogy implies, are much stronger than cell membranes and protect cells from lysing (exploding) in extremely hypotonic (diluted) solutions. You will learn more about these concepts in the Biological Membranes lab.![]()
Artist rendition of an animal cell membrane. Artist rendition of a plant cell wall.
The cytoskeleton makes up the internal framework, like the steel girders that are the framework for buildings in a city that gives each cell its distinctive shape and high level of organization. It is important for cell movement and cell division (mitosis).
Picture of a cell’s cytoskeleton- a complex network of tubules and filaments.
Cytoplasm is a semi-fluid substance (think gelatin) found inside the cell. The cytoplasm encases, cushions and protects the internal organelles. It is the cell landscape found in any space where organelles are not and therefore is much like the lawns and parks of our city.
The cytoplasm is the substance surrounding the visible vacuoles in this cell.
Like a post office, the golgi apparatus is used for shipping those goods created by the ER and ribosomes to the rest of cell.![]()
EM picture of a golgi apparatus Artist rendition of the Golgi Complex
Chloroplasts are organelles found only in plant cells. Like a solar energy plant they use sunlight to create energy for the city. Chloroplasts are the site of photosynthesis a process in which the plant uses carbon dioxide, water and sunlight to create energy in the form of glucose for the plant cell as well as heterotrophs that consume the plant.
Artist rendition of a chloroplast- site of photosynthesis in plant cells.
Mitochondria are found in both plant and animal cells and is the site of cellular respiration. Through this process that will be covered in the Photosynthesis and Respiration lab ATP is created which is used for energy by the cell.
Electron microscope picture of a mitochondria.
The lysosomes are digestive sacs that can break down macromolecules in the cell using the process of hydrolysis. The digestion is carried out with lysosomal enzymes found in the lysosome. Like waste disposal in a city, lysosomes help keep excessive or bulky macromolecules from building up in the cell.
Electron microscope picture of a lysosome.
Think of these membrane sacs that have a variety of functions as containment units for anything in excess in a city. They can hold many substances from organic molecules to simple excess water. Plant cells have a central vacuole that is important in maintaining plant turgidity. You can read more about this phenomenon in the Biological Membranes Lab.
Central vacuole of a plant cell.