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  2. Secondary cell wall - Wikipedia

    en.wikipedia.org/wiki/Secondary_cell_wall

    In the secondary cell wall of fibres of trees a low microfibril angle is found in the S2-layer, while S1 and S3-layers show a higher MFA . However, the MFA can also change depending on the loads on the tissue. It has been shown that in reaction wood the MFA in S2-layer can vary. Tension wood has a low MFA, meaning that the microfibril is ...

  3. Trisulfur - Wikipedia

    en.wikipedia.org/wiki/Trisulfur

    The S 3 molecule, known as trisulfur, sulfur trimer, thiozone, or triatomic sulfur, is a cherry-red allotrope of sulfur.It comprises about 10% of vaporised sulfur at 713 K (440 °C; 824 °F) and 1,333 Pa (10.00 mmHg; 0.1933 psi).

  4. List of unsolved problems in biology - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Developmental psychobiology posed this question since the lack of knowledge about the precise coordination of all cells, even those not related anatomically, in space and time during the embryonic period does not allow us to understand what forces at the cellular level coordinate four very general classes of tissue deformation, namely: tissue ...

  5. Biology - Wikipedia

    en.wikipedia.org/wiki/Biology

    Biology is the scientific study of life. [ 1 ] [ 2 ] [ 3 ] It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. [ 1 ] [ 2 ] [ 3 ] For instance, all organisms are composed of at least one cell that processes hereditary information encoded in genes , which can be transmitted ...

  6. Third heart sound - Wikipedia

    en.wikipedia.org/wiki/Third_heart_sound

    In conditions affecting the pericardium or diseases that primarily affect the heart muscle (restrictive cardiomyopathies) a similar sound can be heard, but is usually more high-pitched and is called a 'pericardial knock'.The S3 can also be confused with a widely split S2, or a mitral opening snap, but these sounds are typically of much higher ...

  7. Biology 101 - Wikipedia

    en.wikipedia.org/wiki/Biology_101

    "Biology 101" is the third season premiere of Community and the 50th episode of the series overall. The episode originally aired on September 22, 2011 on NBC . The episode was written by Neil Goldman and Garrett Donovan and directed by Anthony Russo .

  8. Warning: This article contains spoilers for The Sex Lives of College Girls season 3 finale, "Essex Strong." Sophomore year of college is the perfect time to discover something about yourself, to ...

  9. Biological tests of necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Biological_tests_of...

    However, this does not indicate that the element in question is required for functioning. The element allows the system to function, but its presence is not required in order for the system to function. Tests of sufficiency in biology are used to determine if the presence of an element permits the biological phenomenon to occur.