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Questions tagged [growth]

In reference to a biological system over time, growth refers to the increase in physical size/mass as well as the progression through its life cycle.

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The correlation between a leaf's age and its length in the initial stage of growth [closed]

I am building a machine learning algorithm which predicts the age of a leaf before its maturity period based on its measured length or area. I would like to know whether there is a mathematical ...
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What is Growth and how can we define it to be a defining property of life?

I was reading a book and it said that internal/intrinsic growth is defining property of life and not extrinsic growth as saying accumulation of dust on a book makes it a bit bigger, even if it is by a ...
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Archenteron vs Gastrocoele

What is Difference between “Archenteron” and “Gastrocoele”. Are they same or different? Gastrula is characterized by Archenteron or Gastrocoele or Both?
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Beyond anabolism, what are factors that restrict growth rate?

Beyond obvious constraints in the case of nutrient limitation, what can explain the relatively slow growth rate of cells in rich media? Lab strains of E. coli grow really, really fast. The cell ...
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How do I determine this logistic growth model formula?

The Question Two yeast cells were placed into a special container to which food was continually added, to keep it at a constant concentration. All other factors were set for optimal yeast ...
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How should should I run a yeast experiment where I measure population growth?

Soon I will conduct an experiment involving the population growth of yeast. Nonetheless, I am not sure how long should I let my experiment running for, nor do I know at which intervals should I ...
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Since frogs are ectotherms and supposed to have low metabolic rate, why do they grow so fast and eat so much?

It's always emphasized in literature that endothermy enables high growth rates but requires more food. But look at frogs, for example: bullfrogs, toads, pacman frogs etc. They would readily eat a ...
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Why do seeds grow upwards?

Why do seeds grow upwards? Surely gravity would pull them towards the earth's core? Can anyone shine any light on this? Do seeds that are planted deeper grow more quickly.
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Can you accelerate the growth of a plant by accelerating its surroundings?

I had this weird idea of making plants grow faster when I first visited an indoor nursery which used floodlights instead of sunlight. They turned on during the day and went off during night in cycles. ...
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due to hypersecretion of growth hormone why only terminal growth takes place?

why only terminal growth takes place in acromegaly and gagiantism, due hypersecretion of GH?
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108 views

Does estrogen increase muscular growth in females?

Regarding humans it is said that most psychological effects caused in men by testosterone are caused in women by estrogens. There are many studies on that, particularly regarding temporary shifts of ...
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78 views

Why are humans only so tall/large?

In biology I've learned that cells rapidly divide and can grow and split undefintely, and that certain parts of the body have to grow and evolve before growing, but I am tied up on the fact that the ...
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Does a cell deprived of growth factors undergo apoptosis or G0 stasis?

I can't seem to find a decisive answer on this topic in any of my textbooks. If a cell is deprived of growth factors does it: Activate apoptosis Go into the G0 phase but keep living? Thanks.
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Selective pressure for reduced rates of growth and maturity in primates

Humans are somewhat notable for the slow rate at which they grow and reach physical maturity. Some related primates also take over a decade to reach sexual maturity. However, many mammals – ...
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Breeding mosquitoes at lower temperature

It is well known fact that, to slow down the growth of drosophila, they are grown at 18-19 degree Celsius. It helps in maintaining stocks for longer time without frequent change of food. Is it ...
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Is an animal's body height dependent on its environment?

Imagine the follwing situation: a newly born animal is brought into a small room. This room has no windows, but artifical light to imitate the sunlight. Furthermore, this light behaves like the sun, ...
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415 views

How do trees grow?

A nail is inserted into a tree's trunk at a young stage of its development. At which height will we find the nail after some years? Will it be found higher or at the same height(What extent of ...
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The actual name of growth force

I see how large trees and weeds that are capable of splitting concrete, and realized that I have no idea what this phenomenon is officially called. Google was no help, suggesting root pressure, but ...
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Why do cherries sometimes grow as triplets?

Usually when I think of cherries, I think of them as pairs. I think most of us imagine them that way, but recently, I stumbled on a picture of a triple cherry: Which I found interesting, but I couldn'...
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Are nastic responses growth responses?

I know they are non directional movement responses, but like tropic responses, does their movement involve growth?
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Do all body organs grow in proportion during the period of physical development?

It is obvious that during childhood and puberty, the human body grows uniformly or proportionally so that a child's arm length, for example, is shorter than an adult's arm length but is proportional ...
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What types of plants are Gibberellin used on?

On what type of plant (monocot/ eudicot? family? species?) is Gibberellin used on? I searched through many sources but could not find whether Gibberellin works for all plants or just a specific type ...
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367 views

What determines when plants grow?

I am interested in dryland ecosystems, and I am trying to find material on what determines the time at which plants in dryland ecosystems, either shrubs or grasses, grow and shoot? Is it only related ...
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Do brain cells regenerate in the adult brain?

I know that most cells in the body regenerate, dying and being replaced with new cells. For example, in bone special enzymes move radially outward from the marrow in a narrow tunnel, destroying the ...
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What's the difference between proliferation and diffusion when talking about changes in tumor density?

Cell proliferation and cell diffusion seem to be important quantities to estimate when trying to understand or measure tumor growth, but I don't really understand a) the difference between them or b) ...
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what is the difference between pituitary dwarfism and thyroid dwarfism? [closed]

My book (Comprehensive Biology class XI, by J P Sharma ) mentions of two kinds of dwarfism- "Pituitary Dwarfism" and "Thyroid Dwarfism" but does not provide any details about the matter. so please ...
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Database of cancer cells

I am looking for a database(or any kind of information source) of cancer cells, which has information about the speed of reproduction of these cells, how fast they grow, etc. So I could make my ...
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Effect of transpiration on plant growth

It is said that only about 1-5% of water used by plants is used in photosynthesis while the rest is transpired. Suppose that a plant grows in an environment where the temperature is not too high but ...
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Why is it desirable to couple chemical production to growth?

I have the following question in systems biology: a) Draw a graph showing the relationship of growth (Vbio) and Vefni for the system here. (Let the horizontal axis represent Vbio and the vertical axis ...
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What makes delayed onset muscle soreness stop occurring?

If someone lifts weights or takes a long jog after not doing it for a while, they can experience delayed onset muscle soreness (DOMS). However, when they return to the same exercise days afterwards, ...
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214 views

Do young children grow in spurts

It is a commonplace of my friends and relatives to remark that a young child (younger than 3 years) has had a recent "growth spurt". The underlying assumption is that young children do not grow taller ...
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405 views

Biggest change in size from birth

Which mammal has the largest change in size from birth to fully grown percentage wise?
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434 views

Plant growth in blue light

For the past two weeks, I have been in a group of 3 studying how different lights affect plant growth. So we growth two chickpeas plants and put one in white light and the other in blue light. These ...
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1answer
216 views

Why does hair know when it needs to stop to grow [duplicate]

I'm still not quite sure if head hair grows endlessly, or if it stops at some point, but that's not the question. When the hair on my leg grows, it obviously doesn't grow endlessly, but it also stops ...
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93 views

Measuring optical density with/without re-suspending cells

When measuring absorbance using a plate reader, is it necessary (or better) to resuspend the culture if the plate has been sitting still for 1-2 days? While this could be a good physics question, I ...
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Does the process of photosynthesis occur in insectivorous plants? [closed]

Does the process of photosynthesis occur in insectivorous plants? Can you please give me a clear answer and explain to me how? and also can you describe the environment in which they grow ? Thank you
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Do trees grow from the bottom or the top, or is that oversimplifying?

I was wondering how trees grow. I wonder if it was similar to hair growth which occurs from the follicle. but clearly branches grow from the trunk so there is definitely a difference with hair growth. ...
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270 views

Can growth rate be used as an indicator of fitness in fish populations?

I would like to calculate selection gradients in order to gain insight into the strength and type of selection influencing my study population. (see here for review. http://jgking.web.unc.edu/files/...
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Wet weight measurements: Setting up cultures for measuring growth rate via wet weight

I have some isolates which I am trying to grow in some toxic leachate in order to measure their growth rate I also want to measure the growth rates of certain combinations of these bacteria. I've ...
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Modeling population growth - Variance

I've been studing population growth models, but there's something I can not find that's fustrating. That's a formula for the variance in population growth. I know that other models can be aplied, but ...
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Growth of Axons

Does anybody know a paper in which the growth of axons, i. e. their length in dependence of time was measured? I did some literature mining myself, but couldn' t find any results. I'm looking for a ...
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684 views

Prevent clumping of bacteria in my media so that I can measure turbidity?

Forgive my naivety, I'm an undergraduate Chemical Engineering student doing research this summer into growth rates of various combinations of bacterial isolates. I have about 9 isolates from a toxic ...
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Is this some sort of fungus?

There is something strange growing straight out of the glass windows at work. They look like hairs, about half an inch long, and each have a white spot on the tip of them, slightly weighing them down. ...
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909 views

How are some people able to continue growing after reaching maturity?

This is technically a cross-post of a question posted last year concerning gigantism and how certain people are able to grow far past expectations after it's assumed they've reached maturity. How are ...
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Is there a law that defines an upper bound for the speed of growth of an organism?

I was wondering if there is some biological law (or chemical/physical law for that matter) that limits how fast an organism can grow. I know that the growth of a plant is often restricted by the ...
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Are thunder and lightning necessary for any organisms?

Comparatively irregular events such as forest fires are necessary for some plants to grow (see here). But do any plant or animal species have similar dependence on thunder and/or lightning?
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Exponential growth equation and bacteria

I'm a microbiologist, but I'm teaching some ecology in my intro-level course, so when we got to population growth, I thought I'd use the example of a microbial population. But, I hit a strange problem ...
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At what age does the mouse skull stop growing?

Unless otherwise mandated, neuroscientific research on mice is done with ~7-week old animals. There is a sort-of mantra that at this age their skulls stop growing. However, recently, I noticed a ...
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Are the bacteria in the stomachs of unborn babies beneficial?

Babies are born with bacteria in their stomachs. I heard on The radio that when a child is given antibiotics for the first time unique bacteria in the stomach are destroyed and cannot be replaced. Is ...
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Are Young Girls Stronger than Young Boys?

According to "common wisdom" the average man has, as a proportion of his body weight, 50% more muscle mass than the average woman. This is in addition to how the average man is several inches taller ...