SciencePrimer
SciencePrimer
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  • Просмотров 1 615 807
Gene regulation in bacteria: the lac operon
The lac operon is a wildly used example of transcriptional gene regulation in prokaryotes. Properties of the lac operon illustrate many important features of the way prokaryotes regulate gene expression.
This video is the product of a collaboration between SciencePrimer and Dr. Kerri Warren, Professor of Biology and Public Health at Roger Williams University.
Thank you for watching! I hope you found the video helpful. Comment with questions, suggestions, or requests.
If you found the video helpful, please consider subscribing, hitting the like button, and sharing it with your friends.
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Просмотров: 1 131

Видео

Isostasy: vertical motion of the Earth's crust due to changes in pressure
Просмотров 6 тыс.2 года назад
Isostasy explains vertical motion of the Earth's crust in response to changes in pressure due to climatic events like glaciation, erosion, or sedimentation and to tectonic activity such as the process of mountain formation.
The challenge of understanding exponential patterns
Просмотров 2212 года назад
Our numbering systems allows us to express and manipulate very large and small number easily. However, this ease obscures the fact that we do not have an intuitive sense of how exponential patterns work, nor are we good at comprehending the quantities very large and small numbers actually represent.
From ropes to sound to satellites - how we map the sea floor
Просмотров 2,5 тыс.3 года назад
Our current understanding of the structure of the seafloor is a recent achievement. Less than 200 years ago, the ocean bottom was thought to be a featureless expanse of mud and sediment. Even now, over 100 years since the invention of sonar, only about 15% of the seafloor has been directly mapped. Most maps showing seafloor structure uses mean sea surface measurements taken by satellites to inf...
Hershey and Chase - evidence that genes are DNA | DNA's role in heredity pt2
Просмотров 9403 года назад
Many introductory genetics courses rightfully treat the finding reported in Hershey and Chase's 1952 paper on bacteriophage as pivotal to the widespread acceptance that DNA is the bearer of genetic information. Their work came when most scientists believed that genes were made of protein. This was the case even though almost ten years had passed since Avery MacLeod and McCarty showed that the t...
Features of the ocean bottom | Bathymetric Provinces
Просмотров 13 тыс.3 года назад
As recently as the mid-1800s, many scientists believed that the deep ocean's bottom was lifeless, featureless abyss. This changed with the development of bathymetric maps of the seafloor, which revealed some of the world's largest geological features. Global bathymetric maps have captured the publics' attention and helped revolutionize our understanding of the Earth. Thank you for watching! I h...
Fred Griffith’s discovery and the Avery, McLeod, and McCarty experiment | DNA's role in heredity pt1
Просмотров 1,1 тыс.3 года назад
Among the significant scientific accomplishments of the 20th century was the discovery that DNA is responsible for passing genetic information from generation to generation. As recently as the 1940s, many scientists considered DNA an unlikely candidate to carry heritable information because it is a simple molecule made of just four different nucleic acids providing a very small, four-letter alp...
We live at the bottom of an ocean of air | Introduction to the atmosphere
Просмотров 1,3 тыс.3 года назад
To understand the importance of the atmosphere, it is useful to change how we see our place on Earth. Instead of thinking of us as living on the surface - consider that we live actually at the bottom of an ocean of air. Thank you for watching! I hope you found the video helpful. Comment with questions, suggestions, or requests. If you found the video helpful, please consider subscribing, hittin...
Engineering notation
Просмотров 17 тыс.3 года назад
Most people learn to write numbers in scientific notation using a form called normalized scientific notation. While the normalized form is an efficient way to write large and small numbers, it does not take full advantage of how we've learned to think about numbers. An alternative form called engineering notation uses the fact that we give special meaning to one thousand, one million, and one b...
Currents in the equatorial oceans | equatorial counter currents and equatorial undercurrents
Просмотров 16 тыс.3 года назад
The equatorial oceans are distinct regions characterized by surface and subsurface currents whose behavior is influenced by surrounding wind and water flows and the absence of Coriolis deflection at low latitudes. Related content: Ocean Gyres: ruclips.net/video/LWZEIVpuRxw/видео.html Global wind patterns: ruclips.net/video/ebjKyoQ6YoE/видео.html Pressure gradients: ruclips.net/video/EgHEQGe7kJw...
Sensitivity, specificity, and how prevalence influences the reliability of test results
Просмотров 3,3 тыс.3 года назад
The effectiveness of a test is often reported in terms of the probability that it will detect positive cases. However, due to the way tests work, this is often not enough to evaluate the test's predictive value. This video describes how the prevalence of a condition in a population influences the reliability of test results. 0:00 Introduction 1:11 Sensitivity 1:42 Specificity 2:16 Error matrix ...
What are those streaks on the water? - Langmuir Circulation
Просмотров 11 тыс.4 года назад
Anyone who has spent time near water has probably seen parallel lines of bubble or other floating debris on a windy day. These streaks are caused by a pattern of water movement call Langmuir Circulation, named after the scientist who described the phenomenon back in the 1930s. Thank you for watching! I hope you found the video helpful. Comment with questions, suggestions, or requests. If you fo...
Dihybrid crosses and Mendel's principle of independent assortment
Просмотров 1,4 тыс.4 года назад
A dihybrid cross tracts inheritance patterns of two genes over two generations and is the method used by Mendel to discover the principle of independent assortment. This video is the product of a collaboration between SciencePrimer and Dr. Kerri Warren, Professor of Biology and Public Health at Roger Williams University. Thank you for watching View the "Mendel/Punnett square playlist: tinyurl.c...
How earthquakes show us the inside of the Earth
Просмотров 117 тыс.4 года назад
It is pretty amazing how much we know about the Earth’s interior, given that we can only directly observe a tiny fraction of it. Due to our lack of access to the Earth’s interior, scientists must rely on indirect observations. One way they do this is by studying the movement of pressure waves as they travel through the interior of the Earth. Thank you for watching! I hope you found the video he...
Demo of preparing new shield with a 3-hole punch
Просмотров 6134 года назад
This is a quick demo showing how to use a 3-hole punch to make new shields for the 3D printed visor by 3DVerkstan. The one shown here is the six hole version designed to work with US A4 paper and a 3 hole punch with US spacing. www.youmagine.com/designs/protective-visor-by-3dverkstan The spacer used in the video was 3D printed. From the file available at the link above. It is 1/2 inch wide so i...
The role of the test cross in identifying true breeding individuals | Mendelian Genetics
Просмотров 1,5 тыс.4 года назад
The role of the test cross in identifying true breeding individuals | Mendelian Genetics
Western Boundary Intensification | Ocean currents
Просмотров 22 тыс.4 года назад
Western Boundary Intensification | Ocean currents
Monohybrid crosses and Mendel's principle of segregation
Просмотров 3,7 тыс.4 года назад
Monohybrid crosses and Mendel's principle of segregation
Segregation, independent assortment, and dominance in Mendelian inheritance
Просмотров 6 тыс.4 года назад
Segregation, independent assortment, and dominance in Mendelian inheritance
From the crust to the core, layers of the Earth
Просмотров 1,1 тыс.4 года назад
From the crust to the core, layers of the Earth
Scientific Notation
Просмотров 5 тыс.4 года назад
Scientific Notation
Rossby waves in the oceans - why they form and how they move
Просмотров 35 тыс.4 года назад
Rossby waves in the oceans - why they form and how they move
Ocean Gyres and Geostrophic Flow
Просмотров 59 тыс.4 года назад
Ocean Gyres and Geostrophic Flow
Surface currents, the Ekman spiral, and Ekman transport
Просмотров 110 тыс.4 года назад
Surface currents, the Ekman spiral, and Ekman transport
Protein Synthesis Step 1- Transcription Overview
Просмотров 3254 года назад
Protein Synthesis Step 1- Transcription Overview
Transcription vs Translation - what is the difference
Просмотров 9 тыс.5 лет назад
Transcription vs Translation - what is the difference
The Carbon Cycle - biogeochemistry
Просмотров 9175 лет назад
The Carbon Cycle - biogeochemistry
Biogeochemistry overview
Просмотров 1,7 тыс.5 лет назад
Biogeochemistry overview
Blue-white screening for DNA isolation: Pick a white colony
Просмотров 18 тыс.5 лет назад
Blue-white screening for DNA isolation: Pick a white colony
Complementation testing and Rescue - Beadle and Tatum part 3
Просмотров 5 тыс.5 лет назад
Complementation testing and Rescue - Beadle and Tatum part 3

Комментарии

  • @aliahbasri7837
    @aliahbasri7837 28 минут назад

    hai, tq for this video. I have question that i need to clarified. i have original number 9.456*10^{-4} & the question to the answer must be in 10^{-3}. Those this mean 9.456*10^{-4} = 94.56*10^{-3}?

  • @user-un7tj2fr5t
    @user-un7tj2fr5t 7 дней назад

    The pool table analogy is so wrong - don’t believe it.

  • @siddharthkumargopal2037
    @siddharthkumargopal2037 19 дней назад

    Mate, you are doing the work of God… You just earned a subscriber… Amazing explanations. A lifesaver for many Geology students like me… Thanks a lot.

  • @biswajitsonowal5148
    @biswajitsonowal5148 19 дней назад

    U reading it too fast….average student like me can’t grasp it …. Thank you

  • @siemenpeeters4852
    @siemenpeeters4852 24 дня назад

    Wow, interesting!

  • @mayanksingh0044
    @mayanksingh0044 25 дней назад

    Underrated video and underrated channel

  • @therawbean69
    @therawbean69 26 дней назад

    500th like :)

  • @ayeniola5697
    @ayeniola5697 29 дней назад

    Thanks

  • @Urwithech
    @Urwithech Месяц назад

    Upsc pyq solved

  • @jhdw1616
    @jhdw1616 Месяц назад

    LOL water is level it doesn't "follow" the ridges on the bottom of the ocean

  • @coolguy12343
    @coolguy12343 Месяц назад

    I mean ultra violet does have a point there it is explained in simple words plus if i watched this vid i could have gotten a higher grade!

  • @ijakeme
    @ijakeme Месяц назад

    That's a lot to remember

  • @gautamsah5075
    @gautamsah5075 Месяц назад

    Very good. How do you make such presentation? Using which software?

  • @minerva108
    @minerva108 Месяц назад

    Wonderful 🎉

  • @IffatFarooqui-vp2lz
    @IffatFarooqui-vp2lz Месяц назад

    thnx for the lucid explanation

  • @pbail2456
    @pbail2456 Месяц назад

    WHY does this Color-Trend' have to be at the end of the show ? Not - a "Gay pride Flag fan.

  • @avaneedubey5749
    @avaneedubey5749 Месяц назад

    this video was made so thoughtfully. you did not leave anything, from causes to variations and distribution! thanks!!!

  • @maxpercer7119
    @maxpercer7119 Месяц назад

    It is generally false to say that the mass of the water displaced equals the mass of a floating object. Instead, the correct statement is that the weight of the water displaced equals the weight of the floating object.

  • @spblore
    @spblore Месяц назад

    Jus lyk a wow❤ explanation

  • @aleksanderiwanek9712
    @aleksanderiwanek9712 2 месяца назад

    very well explained

  • @reddyandre
    @reddyandre 2 месяца назад

    It's not the closest point to the sun; it's the angle of incidence closest to 90 degrees.

  • @pigeon-hater2267
    @pigeon-hater2267 2 месяца назад

    Thank you. You made it super simple to understand

  • @catherinereginahill5110
    @catherinereginahill5110 2 месяца назад

    I have a question. I read in an Oceanography lab manual that the counter-currents flow fastest during the Equinoxes. Why would that be? Is is just a matter of more direct energy being added to the system by the sun?

  • @loxix100loxix100
    @loxix100loxix100 2 месяца назад

    Very good video! Thanks a lot, very informative and simple to understand

  • @meronghirmay4960
    @meronghirmay4960 2 месяца назад

    Thank you for the clear explanation. It is always good to know the equations behind the work.

  • @a_bex.1501
    @a_bex.1501 3 месяца назад

    I cannot for the life of me understand why PPV and NPV are influenced by prevalence but LR+ and LR- are not

  • @ananthagirikarthik9746
    @ananthagirikarthik9746 3 месяца назад

    so good explanations.....

  • @daniellizarbe2591
    @daniellizarbe2591 3 месяца назад

    Thank you so much, I'm writing my master's thesis on this topic, and your video helped me a lot to understand the upwelling dynamics simply.

  • @Official_SI-LO
    @Official_SI-LO 3 месяца назад

    Dude, I love you. I sincerely hope I'd find your channel earlier at the beggining of my career. Much apreciated.

  • @mahmood.faiyaz.241
    @mahmood.faiyaz.241 3 месяца назад

    This is like the perfect video on the topic!

  • @Tester-lk8om
    @Tester-lk8om 3 месяца назад

    Way better explained than my georgraphy professer at my local university, thank you

  • @nikashnaorem1485
    @nikashnaorem1485 3 месяца назад

    at what pH each reaction is triggered since all reactions look to be reversible, which would be the spontaneous reactions at which pH. please help

  • @manishvishnoi227
    @manishvishnoi227 3 месяца назад

    GREAT WAY OF EXPLAING

  • @tomkennedy5112
    @tomkennedy5112 3 месяца назад

    Thank you so much much much!

  • @chilukurisravani5853
    @chilukurisravani5853 4 месяца назад

    please do kelvin wave too

  • @adelenoiret3273
    @adelenoiret3273 4 месяца назад

    This explanation was exactly what I needed, it's a great video thank you so much!

  • @davidaugustofc2574
    @davidaugustofc2574 4 месяца назад

    I don't know how this is gonna help me in mechanical engineering but I do find it super interesting.

  • @farkleberry867
    @farkleberry867 4 месяца назад

    really excellent video! Thank you so much!

  • @xlHypno
    @xlHypno 4 месяца назад

    Thank you. It could not be more clear.

  • @Urlocalytber
    @Urlocalytber 4 месяца назад

    give me 5 main ideas of it

  • @DrakeLarson-js9px
    @DrakeLarson-js9px 4 месяца назад

    This is an outstanding overview on this topic (seismic waves and the profiling methods of our inner-earth).

  • @vedashreer5854
    @vedashreer5854 5 месяцев назад

    yes it was amazing

  • @GlennBLey
    @GlennBLey 5 месяцев назад

    Yes! Love it! Thanks!

  • @nawtynick9
    @nawtynick9 5 месяцев назад

    That's so interesting. You make it so easy to understand new concepts. Please keep making videos. Thanks again.

    • @SciencePrimer
      @SciencePrimer 5 месяцев назад

      Thank you for the kind words

  • @sundaslaraib5699
    @sundaslaraib5699 5 месяцев назад

    Excellent explanation🎉

  • @auradiaz6060
    @auradiaz6060 5 месяцев назад

    You are a life saver thank you.

  • @daphnec4016
    @daphnec4016 5 месяцев назад

    Thank you!!

  • @emfyates
    @emfyates 5 месяцев назад

    How is this not more popular? You did a great job here. This proved to be very helpful for a student I'm tutoring.

  • @astro_nahuel_arg
    @astro_nahuel_arg 6 месяцев назад

    Neat

  • @rjones6219
    @rjones6219 6 месяцев назад

    Watching this video, just prompted a long forgotten memory. As a child in the early 50s, I used to read a comic, one of the stories was about a scientist who bored his way to the centre of the earth, in a special machine he developed. It had a sharp nose like one of those screw drills. He built into it a refrigeration system to keep the interior cool. (Must admit, even at that very early age, I was puzzled how he could keep the interior cool, with so much heat outside, where did he vent the heat to?).