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New Microscope Offers Unprecedented View Of Life Inside A Cell

Anybody who was bitten by the biology bug in high school should find what these gifs show to be pretty amazing. These are a few of the stages that happen to our chromosomes during eukaryotic cellular division, a process vital to life when one parent cell splits to become two.

They were produced with a new microscopy technique developed in the Howard Hughes Medical Institute lab led by 2014 Nobel Prize in Chemistry winner Eric Betzig. The method, called lattice light sheet microscopy, lets scientists take high-speed, high-resolution images of objects smaller than cells. It does this without bombarding the cells with lethal doses of electromagnetic radiation, so researchers can watch cellular processes as they unfold in real time and in three dimensions.

Scientists have started using the new microscope to watch molecules move in multicellular organisms, to track developmental changes at the cellular level and to see viruses as they invade a cell. Read more about how the microscope works here. Learn what’s happening in each gif and see the video below.

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Best Online Lectures for College Courses

Please reblog and add to the list! Let’s make sure all the studyblrs have these resources available to them so we can all be successful! I will do my best to keep the original post updated here.

I thought I would start a list of YouTube channels (or other venues) that have the best lecture videos out there. Not only are online lectures a great supplement to help you understand the content your professors teach you in class, they’re also a useful tool for prestudying before class! I try to watch lectures of the topic that will be lectured on next before each class so that I already have notes coming into the lecture, meaning I can focus on learning the material by only adding on what’s necessary to my notes as opposed to frantically copying everything on the board or powerpoint slide.

BIOLOGY

General Biology

CHEMISTRY

Organic Chemistry

Biochemistry

PHYSICS

Covers Many Physics Courses/Topics

MATHEMATICS

Calculus

Discrete Mathematics

Linear Algebra

COMPUTER SCIENCE

Data Structures

Object Oriented Programming

Software Engineering

Database

Operating Systems

Structure and Interpretation of Computer Programs

Computer Architecture

Programming

Artificial Intelligence

Algorithms

COVERS MANY SUBJECT AREAS

Synthetic enzymes hint at life without DNA or RNA

Enzymes that don’t exist in nature have been made from genetic material that doesn’t exist in nature either, called XNA, or xeno nucleic acid.

It’s the first time this has been done and the results reinforce the possibility that life could evolve without DNA or RNA, the two self-replicating molecules considered indispensible for life on Earth.

“Our work with XNA shows that there’s no fundamental imperative for RNA and DNA to be prerequisites for life,” says Philipp Holliger of the Laboratory of Molecular Biology in Cambridge, UK, the same laboratory where the structure of DNA was discovered in 1953 by Francis Crick and James Watson.

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