Chemistry is the study of matter and the ways in which different forms of matter combine with each other
Chemistry is the study of matter. Our understanding of chemical processes thus depends on our ability to acquire accurate information about matter. Often, this information is quantitative, in the form of measurements. In this lab, you will be introduced to some common measuring devices, and learn how to use them to obtain correct measurements, each with correct precision. A metric ruler will be used to measure length in centimeters (cm).
Introduction: Genetic information contained in mRNA is in the form of codons, sequences of three nucleotides, which are translated into amino acids which then combine to form proteins. At certain sites in a protein's structure, amino acid composition is not critical. Yet certain amino acids occur at such sites up to six times more often than other amino acids. In the 1960's, molecular biologists sought to determine if amino acid composition was a reflection of the genetic code or if certain amino acids were naturally selected as optimal.
Question: Are frequencies of particular amino acids simply a consequence of random permutations of the genetic code or instead a product of natural selection?
Supplement to 'The Genetic Code': https://cnx.org/contents/jVCgr5SL@15.43:aXYynRWE@10/15-1-The-Genetic-Code
Introduction: Antibodies are proteins that react with foreign invaders during a humoral immune response. Antigens, small substituents of foreign invaders, elicit an immune response when they bind to the antibody. Variable regions of amino acid chains comprising the antibody create binding sites. A particular antibody has specificity to bind to one or more particular antigens.
Questions: How is antigen binding to an antibody related to antigen concentration? How can we determine binding properties of antibodies?
Supplement to 'Anitbodies': https://cnx.org/contents/jVCgr5SL@15.43:jN1G3E9L@10/42-3-Antibodies
Esta animacion muestra cÃ³mo se absorben los herbicidas por las raÃces, e ilustra la ruta que sigue el herbicida a travÃ©s de la raÃz, para llegar al sistema vascular de la planta.
Academic Journal of Surgery (AJS) is the official scientific journal of Research Center for Improvement of Surgical Outcomes & Procedures (RCISOP) affiliated to Tehran University of Medical Sciences. AJS is an open access, peer-reviewed, and quarterly journal that considers for publication articles in all fields and specialties of surgery in English language. This journal has both online and print versions and no charges are levied for publication.
Currently, AJS is indexed and abstracted in: Citefactor, UlrichsWeb, Index Copernicus (IC), Directory of Research Journal Indexing (DRJI), Google Scholar, International Committee of Medical Journal Editors (ICMJE), Open Academic Journals Index (OAJI), Advanced Science Index (ASI), Unversal Impact Factor (UIF), Directory of Abstract Indexing for Journals (DAJI), JournalTOCs, Electronic Journal Library (EZB), Scientific Indexing Services (SIS), AcademicKeys, Research Bible, InfoBase Index, Cosmoc Impacr Factor, Scholar Steer, Magiran, and IranMedex.
AJS focuses on all fields and specialties of surgery including General Surgery, Orthopedic Surgery, Pediatric Surgery, Neurosurgery, Plastic Surgery, Cardiothoracic Surgery, Vascular Surgery, Endocrine Surgery, GI Surgery, Colorectal Surgery, Urology, Surgical Oncology, Radiology, Anaesthesia, Trauma Services, ENT, particularly about surgical practice and research. Content includes Original Articles, Systematic Review or Meta-Analysis, Review Articles, Case Reports, Letters to the Editor, Clinical Trials and Health Policy Challenge.
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