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Wednesday, 30 March 2016

Marmosets | Animal Profile



Marmosets, are very small, but very cute monkeys. They're only around 22cm long, there's about 22 subspecies of them.

Compared to other monkeys, they show some very different features, they have claws rather than fingernails and strong hairs on their wrists. Unlike us, they don't have any wisdom teeth. 

Their body temperature is unbelievably variable, changing by up to 4 °C in a day. Marmosets are native to South America and have been found in Bolivia, Brazil, Colombia, Ecuador, Paraguay and Peru although they've been spotted in Central America and Mexico. Unfortunately, they have also been raised as pets.

Saturday, 26 March 2016

ANIMAL A-Z: OUT NOW!!!!

My new book, an A-Z guide to some of the hidden gems of the Animal Kingdom is OUT! Check out the links below:
 
 

Friday, 25 March 2016

MY NEW BOOK! ANIMAL A-Z!!

My new book, an A-Z guide to the Animal Kingdom will be released in the next couple of days on Amazon and Amazon Kindle. The book contains a huge range of animals, from the weird to the wonderful and everything in between. Below is a selection of animals from the book:

  • The Aye-Aye
  • Antelope
  • American Alligator
  • The Tarsier
  • Porpoise
  • Seals
  • Puffins
  • Tasmanian Devil
  • The Quagga
  • Tigers
  • Lions
  • Sea Lions
  • Clownfish
  • The Yellow Billed Hornbill
  • The Uakaris

There's this and a whole lot more in my book! When it's released, I'll add a link here so you can check it out :)



 

What is an ectotherm?

 

An ectotherm is an animal (perhaps a reptile or fish) which can't control their body temperature internally - they control their body temperature through their behaviour. This might be through a number of ways - including physically moving from one place to another, so from direct sunlight to shade so they don't overheat.

In the case of ectotherms, their internal temperature depends on that of their surroundings and their activity level depends on the external temperature. They're more active at higher temperatures and less active at lower temperatures.

As far as their metabolic rate is concerned, it's variable and they generate very little heat themselves.
 

Tuesday, 22 March 2016

Survival Responses in Plants

Another type of growth factor are auxins. Auxins stimulate growth of shoots by cell elongation. This is where the cell walls become loose and stretchy, the cell then gets longer. At a high auxin concentration, auxins inhibit growth in the roots. A specific type of auxin, Indoleacetic acid (IAA) is an important type. It's produced in tips of shoots in flowering plants. As the plant works to control it's growth and respond to the stimuli, IAA is moved around. It moves by diffusion and active transport over short distances, across longer distances IAA is moved via the phloem. Different levels of IAA across the plant results in uneven growth of the plant - this means the plant then grows towards the light for example.

Plants, particularly flowering plants need to respond to their surroundings like animals do, in order to increase their chances of survival. They can sense gravity so their roots grow in the right direction. They also respond to light so they can maximise the amount of light they receive for photosynthesis. Plants which climb have a sense of touch, they find things to climb so they can reach the sunlight.


Tropism is this response to directional stimulus. A directional stimulus is just a response to a stimulus coming from one direction. Plants respond to this stimulus by regulating their growth. Positive stimuli is growth towards the stimulus, negative tropism growing away from the stimulus.

The plants responses are brought about by growth factors - pretty much like the plants hormones. This is because they don't have a nervous system like us. They also don't have a circulatory system, hence the reason why growth factors can't be called hormones. Growth factors are chemicals which speed up or slow down plant growth. They're produced in parts of the plant which grows (the shoot tips and leaves). Once they've been made, they move to where they're needed in the plant. One example of a growth factor is gibberellin, this stimulates flowering and seed germination.
 

Sunday, 20 March 2016

What is a receptor?

A receptor is an organ or cell which can respond to light, heat, or another external factor. They transmit an electrical impulse to the sensory nerve - this kick-starts the reflex arc.  There are many different kinds of receptors, all of which are specific to one kind of stimulus, they're all given names:


Mechanoreceptors - detect mechanical stimulus like pressure/vibrations
Thermoreceptors -  detect heat
Baroreceptors - detect high/low blood pressure in the heart
Chemoreceptors - detect chemical changes in the heart, so a change in oxygen, carbon dioxide or pH level




Fun Fact:

The retina of the octopus has up to 20 million light receptors :)



Friday, 18 March 2016

What is diabetes?


Diabetes is a condition which means your blood glucose levels are very erratic without intervention. There are two types - type 1 and type 2.

If you've got type 1 diabetes then the beta cells don't produce any insulin. After eating, the blood glucose levels rise and stay high - this can cause hyperglycaemia, this could be life-threatening. The kidneys can't absorb all the excess glucose so some of it's excreted in the urine. Type 1 Diabetes is treated through regular insulin injections, these, of course, need very careful monitoring because too much could cause a dangerous drop in blood glucose - hypoglycaemia. On top of that, a carefully monitored diet and controlling simple carbohydrate (glucose) intake can avoid sudden rises.

Type 2 diabetes is often acquired later in life and in most cases, is linked with obesity. In this case, the beta cells aren't producing enough insulin, or the body's cells aren't properly responding to the insulin. The cells might not be responding properly to insulin because receptors on the cell membranes may not be working properly. In short, the blood glucose level is higher than normal. This type of diabetes can be controlled by eating well, loosing weight and monitoring glucose intake. If all else fails, glucose lowering tablets can be prescribed if weight-loss and diet control can't control it.
 

Thursday, 17 March 2016

Big Cats vs Little Cats Part 1







Over the course of evolution, cats have gone from an apex hunter to living room lounger. These cats have got a lot in common with their fearsome ancestors. If they were bigger, they’d probably try to eat you – or would they?
 
When you think of the tiger or lion you probably think of a big dangerous cat, a crazy man eater. They can actually be super friendly and super nice. Granted, they can be aggressive, but it’s not the first thing I’d think of. They’re socially dependent, loving and affectionate creatures who need food!

When you look at Lions, they’re continually giving off communication all the time- professionals can easily get tuned into the small signs that Lions continuously give off. They’ve got little tale –tale signs, a rhythmic twitch for example. Even something as simple as yawning is quite a complex sign. Not always, but a lot of the time, Lions yawn to ‘show off’ their teeth – pretty much a dominance thing.

Your cat uses its own body language to communicate like a lion, except they’ve got one major difference. They have fewer facial muscles so they find it harder to communicate the way a lion does – domestic cats use their tongue, mouth, tail and ears to communicate.  Tail up – your cat is happy and approachable. Unlike dogs, if they’re ‘wagging’ their tail, they’re agitated. Surprisingly, I’d avoid giving your cat direct eye contact. This sends then mixed messages and even is a sign of aggression. If you blink slowly, you’ll reassure your feline friend, you’re not a threat and only in it for the cuddles! It also has the benefit, they’ll trust you!

The domestic cat is the latest addition to the cat family – a product of 10 million years of evolution. A lot of what your cat does comes from their wild relatives. Our cat has a huge love of acrobatics – an ability which has its roots in South East Asia- the birthplace of all cats. This hot and humid climate with trees up to 100m high was a perfect location for cats to hone their acrobatic skills. In this climate, climbing trees was the best way of getting food.

Over this period, cats evolved to leap and to swing through trees – reaching up to 40mph – quick enough to hunt birds and monkeys. One cat still lives in the treetops just like its ancestors, the Clouded Leopard, so rare we don’t know how many are left in the wild. Breeding centres are one of the only places to see these elusive Clouded Leopards. Its spotted coat makes for perfect camouflage amongst the dappled jungle light.

The Clouded Leopard’s tail is often longer than their body, this means they can balance like a tightrope walker, elegantly dashing through the trees.

Our cats have some of these amazing adaptations for climbing; they’ve got hooked claws up to 5cm long. They can grip most surfaces, their paws sense vibrations to check the route is safe.
 

Cats are one of the only animals born without a fear of heights – they’ve got one issue though! Unlike a lot of other animals, their front facing paws mean they can’t climb down easily. Some cats can get away with this because they’ve got rotatable paws. This is the reason why thousands of our pets get stranded high up in our trees every year.  When they get in that situation, where they are stuck - some cats pick leaping as their best option.

All of our cats have acquired some of the Clouded Leopards climbing abilities. Clouded Leopard kittens spend almost every waking minute playing – this is how your cat learnt too. Much like us they get the hang the hang of things by observation and repetition. When cats play, ‘happy’ chemicals are released in their brain; this encourages them to carry on playing and learning. One major game our cats enjoy – even through adulthood is stalking prey. They stalk it until they get close enough to pounce. They’re skills are so advanced that the prey rarely sees it until the cat until it’s too late.
 
 

Wednesday, 16 March 2016

ANDi the Monkey


ANDi was the first ever genetically modified monkey. He was given the name ANDi because it's backwards for inserted DNA. Whilst he was still an unfertilised egg, he was given a simple marker gene which can be easily identified within his genetic blueprint. The idea being, that we can then have laboratory animals carrying genes associated with specific medical issues.


The Scientist's goal was to show that a foreign gene could be inserted into a primate's chromosome to produce a functional protein. They chose this gene in particular because it emits a fluorescent green glow easily seen under a microscope. They then took tissue samples from ANDi's cheek, hair and umbilical cord. These samples confirmed the presence of the gene - but they could see no green protein. This could be for a variety of reasons, some as small as the quantity of the protein could be too small. They also say that some genetically modified animals don't start producing the foreign protein until after they're a year old.


Other than that, it looks as if he's perfectly normal, happy, healthy, playing with other monkeys as he should - enjoying monkey life!

Monday, 14 March 2016

British Science Week 2016


Science week is a ten day celebration of all things Science, Technology, Engineering and Maths. Across the UK more than 1.6 million people get involved with events nationwide - getting inspired. Over this week, I'll be posting some of my favourite parts of science.

Follow me!
Twitter @Sci_Sparks
The Young Scientists Journal : @YSJournal

What is Meldonium? | Drug Profile

Meldonium was banned because it aids oxygen uptake and endurance.

Meldonium, sometimes called mildronate, taken by Maria Sharapova for virtually 10 years was originally designed to treat ischemia. Ischemia is a condition in which there's a reduction in blood supply to the body tissue, it also might have benefits for diabetes sufferers.

Meldonium adjusts the body's use of energy, stimulating glucose metabolism and helping to clear a fatty build up in arteries. You can get Meldonium mainly in Russia and Latvia but the drug is banned in the US.

Surprisingly, the drug was often given to Soviet troops in the 1980s to boost their stamina whilst fighting in Afghanistan. Since Maria's story came out, the manufacturers of Meldonium have come out to say the normal course of treatment is 4-6 weeks. Having said that, this all depends on dosage.

Of course, the level of the benefits depend on the dosage, something of which Maria Sharapova will need to provide strong evidence of when she goes before an ITF panel.
 

Sunday, 13 March 2016

What is homeostasis?


Animals (including us) use a system called homeostasis to maintain a constant internal environment. This keeps temperature, pH and blood glucose level all constant.

There are a number of systems in place to keep this all level, these are called homeostatic systems. They detect a change and respond by negative feedback. The systems involve receptors (these detect the changes), a communication system (to communicate the changes) and effectors which make the change.

Hypothermia occurs when the body temperature is too low, this involves positive feedback. Below 35C and you're hypothermic. It happens when heats lost from the body quicker than it can be produced. As body temperature falls the brain doesn't work properly, shivering stops and the body temperature falls even more - basically, you're in trouble!

Positive feedback takes the body temperature further away from the normal level, body temperature continues to decrease unless some action is taken! - this system of positive feedback isn't involved in homeostasis because it doesn't keep your internal environment constant.
 

Thursday, 10 March 2016

How does you brain control your heart rate?

Your heart is a muscle, it pumps blood around your body as it contracts. Inside your heart is essentially a network of nodes and vessels, these help nerve impulses from your brain tell it when to contract.

One of these nodes, the SAN (sinoatrial node) generate these electrical impulses which cause the heart to contract. The rate at which the SAN works (essentially your heart rate) is unconsciously controlled by part of your brain called the medulla. Animals (including humans) alter their heart rate to respond to certain stimuli - for example, your heart will beat faster if you've just been running. This system ensures that your body receives enough blood and oxygen to function.

For the body to respond to something, it first needs to be detected. There are two main types of receptors which help to control  heart rate - baroreceptors and chemoreceptors.

Baroreceptors - these detect pressure in the aorta and vena cava. They're stimulated by high and low blood pressure. If you think about barometers which detect atmospheric pressure changes, that's essentially what a baroreceptor does, just in your heart!

Chemoreceptors - these are chemical receptors, they're found in the aorta and carotid artery (a major artery in the neck) and also in the medulla. The chemoreceptors monitor oxygen level in the blood, carbon dioxide level and pH. Knowing the pH level is very useful because its an indicator of oxygen level.

Once these receptors detect a change, electrical impulses are sent to the medulla along sensory neurones. The medulla processes this information and sends impulses to the SAN and the heart rate is adjusted.

This post specifically relates to AQA A-Level Biology Unit 5 - Responding to the Environment

Wednesday, 9 March 2016

What are Fertilisers?



I'm sure we've all either used fertilisers or been around your parents when they've been using fertilisers. Fertilisers provide crops with chemicals needed for growth, like nitrates. This is because crops use up minerals as they grow and the soil can't usually supply enough minerals to fulfil demand.


There are two main types of fertilisers - natural and artificial. Natural fertilisers are made up of organic matter - like manure and sewage sludge. These don't have a set combination of minerals - there's no 'recipe' pretty much just because they're natural.

Artificial fertilisers are man made using inorganic material - unlike natural fertilisers there is a 'recipe' and the recipe depends purely on what you're growing and where you're growing it. These contain pure chemicals like ammonium nitrate in the form of powders or pellets.


Whether they're artificial or natural, they provide crops with the minerals they need for growth, like nitrates. Over time, this level needs to be replenished because they use up the minerals as they grow. The job then falls to the farmers who decide how much to use, too much is too expensive, too little and it would get washed away before it had an affect.  

When fertilisers are washed off of fields (leached), this causes the problem of Eutrophication. Excess fertiliser causes an algal bloom, this blocks light, in turn, it reduces photosynthesis. This means that submerged plants can't carry out photosynthesis, they can only respire so die. Saprobiotic microorganisms aerobically respire, over time the oxygen supply is depleted and fish also die.



This article specifically relates to AQA A2 Biology Unit 4

Monday, 7 March 2016

Maria Sharapova: "I've failed a drugs test" | What is Meldonium?


Former world number one, Maria Sharapova has been taking a drug called Meldonium for 10 years. On January 1st, this year, it was entered on the banned list – Sharapova wasn’t informed and she failed a drugs test at the Australian Open.

She’s been taking it since 2006 due to persistent health issues, now, the five time grand slam champion’s not aware of the sanctions she’ll face as a consequence. Since Wimbledon last year, she’s only played four tournaments. This year, she’s only played the Australian Open. She’s currently struggling with various different injuries but it’s likely this revelation will have an even bigger effect on her 2016 schedule.

It’s quite a controversial drug – it’s used in Russia and Lithuania but USA hasn’t approved the drug. Clinically speaking, it was first used to treat angina and myocardial infarction (heart attacks). It’s also been known to help treat diabetes and some neurological issues. In her press conference, Maria said that she’s got quite a large family history of diabetes. More recent reports suggest that it can improve learning and memory. Weirdly it might also have an effect on testosterone and men’s health.

As far as sport is concerned – this is a metabolic performance enhancer. This basically means that Sharapova - amongst the health benefits she was already taking the drug for, would have an enhanced energy and a stronger heart muscle. In short – she’d have more energy and be able to last longer on the tennis court. It also would have had an improvement with movement coordination and concentration. It also has a positive effect on the energy metabolism of the body – activating the central nervous system.

At this stage, it’s unclear as to what sanctions she would face, the ITF (International Tennis Federation) in conjunction with WADA (world anti-doping agency) will look at various different factors like who gave the drug to her, was she aware of the effects? Whatever sanction she’ll face she, and her team have got  lot of explaining to do.



 

Glow in the Dark Cats


This might seem a little odd - and a little like someone has just done a pretty good photoshop job, but I promise this is all true! Scientists have actually "created" glow in the dark Cats, Monkeys and fish. In 2007 South Korean scientists inserted the glow in the dark gene then cloned these cats. The end result? Fluffy, florescent felines! They did this through taking samples of skin cells from Turkish Angora cats. They then used a virus to insert genetic instructions for making a red florescent protein. They put this altered nuclei back into the eggs for cloning. You might now be thinking - what's the point? Well, scientists are hoping that they could, eventually create laboratory animals with human genetic disorders - although this does of course, create a massive ethical issue!

Thursday, 3 March 2016

How big of an issue is hearing loss?




Thankfully, I don't know anyone who's got hearing loss (or at least hearing loss which isn't selective!! :)) But according to the World Health Organisation, this is a very big issue. In fact, today is World Hearing Day. Here are the stats...





32 million children worldwide have disabling hearing loss
60% of cases are preventable - only 17% are from birth related causes.
31% of hearing loss cases result from infections



Make sure you're aware of the symptoms to prevent any issues escalating.

 

Wednesday, 2 March 2016

What is Global Warming?

We hear about global warming all the time - our planet is unique in the sense it could well be the only one with life, so we need to preserve it. But at the moment we're damaging it. This is partly the aim of the UN's Global Goals. This is to ensure that future generations get to enjoy our planet too. Global warming is caused by increasing carbon dioxide levels - this leads to an increase in average global temperature.

Human activity has caused global warming by enhancing what's called the Greenhouse Effect. This is because, greenhouse gases absorb outgoing energy so less is lost to space. To some degree, the greenhouse effect essential to keep planet warm but too much and planet warms up.

The two most common greenhouse gases, carbon dioxide and methane are to blame for this increase.


Burning fossil fuels, farming and deforestation all increases atmospheric concentrations of carbon dioxide. This  effects all organisms and we need to do something about it!

Scott Kelly's Return to Earth | #TimPeakeUpdate


Tim Peake's had some major changes on board the ISS recently - early this morning Commander of the Space Station, Scott Kelly returned to earth after a staggering 340 days in space. He left Earth early last year and hasn't been back since. The job now lies in figuring out Earth - and the minor change of gravity!


Only one person has beaten this record of 340 days which Scott shares with two other Russian crewmates - Valeri Polakov who spent 14 months aboard the Mir Space Station. What's even more special about Scott's time in space is that now, NASA can look at what 11 months in space does to his body, with Scott's identical twin and all because Scott's twin is genetically identical they can directly compare what 11 months in space does to your body.


Across his year in space, he's tweeted 1,000 images, worked on hundreds of experiments, carried out many space walks and above all he's looked at our planet in a totally new way. Follow @StationCDRKelly as he rediscovers planet Earth.