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MOLECULAR STRUCTURE skull The bony structure that serves as the underlying supporting framework of the head. Genus of the prehistoric American saber-toothed tiger, or saber-toothed cat. They are required to maintain the balance between calcium and potassium required for normal heart action. The incorporation new genetic material into somatic cells for therapeutic purposes. southern blotting (also southern blot) A method developed by E. Southern for transferring DNA fragments, separated in electrophoretic gels, onto membrane filters. stratum granulosum /STRAT-əm gran-yə-LŌ-səm/ The layer of the skin lying between the stratum germinativum and stratum lucidum. SUBCUTICULAR SUTURES | SURGEON'S KNOT Svedberg unit (S) A sedimentation coefficient of 1 x 10 symbiosis /SIM-bye-ō-səs/ n. (1) a line of fusion between bones that were once separate; (2) a joint, lined by cartilage, between two bones (as between two vertebrae). A plant sterol with a molecular structure similar to that of cholesterol. Sodium salts are found in body fluids (blood, serum, and lymph) and in the tissues (in lower concentrations). Blocks of mesoderm along the sides of a chordate embryo. Able to tolerate only a narrow range of temperatures. The flat bone at the front of the chest that connects the ribs on one side with those on the other. PICTURE OF STOMACH | HUMAN DIGESTIVE SYSTEM stool Excrement discharged from the bowels. stratum germinativum /STRAT-əm jer-men-ə-TEE-vəm/ (pl strata germinativa /STRAT-ə jer-men-ə-TEE-və/) The skin's inmost layer, which is composed of columnar epithelial cells cells that divide to replace the outer layers as they wear away. superoxide dismutase (SOD) /SOO-pər-AWK-sīd DIS-myoo-tāz/ n. An enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen. suture (1) a line of union forming an immovable joint (as in the skull or between the segments of a gastropod shell) SUTURES OF HUMAN SKULL | SUTURES IN A DEER SKULL (2) surgical stitches uniting two parts (or the line of union so formed). Il Festival di Baglioni volge al termine: stasera si sapr il vincitore del Festival.Prima molti ospiti, oltre alla cantante romagnola , Renga-Nek-Pezzali, Fiorella Mannoia, Antonella Clerici. There are two sex chromosome systems (1) the XX /XY system, where XY individuals are male, and XX individuals are female (the usual system, for example, in mammals and butterflies); and (2) the WW/WZ system; where WW individuals are male, and WZ individuals are female (the normal system in birds, for example). sex linkage A linkage involving a locus on the X or Z chromosome. A region of modern Russia that formerly existed as a separate continent of the same name. Also known as the sigmoid flexure of the descending colon. Any process in which a cell changes one type of stimulus into another. sex chromosomes Chromosomes that determine the sex of an individual.

Thence they naturally drew the conclusion that, cost what it may, they must prove faithful to Yahweh, so as to avert a like punishment in the future. The region between the Sahara desert and savannas to the south; characterized by extended dry seasons, which alternate with relatively brief rainy seasons. The salt concentration of a solution, particularly of a body of water. Saprophites are often called "decomposers." sarcoma /sar-KŌM-ə/ n. Specific types of sarcomas are named for the types of tissue from which they arise (e.g., angiosarcoma, chondrosarcoma, hemangiosarcoma, leiomyosarcoma, liposarcoma, lymphangiosarcoma, osteosarcoma, rhabdomyosarcoma). The sarcomere is the fundamental unit of muscle structure. PICTURES Scholastics (also schoolmen) Christian medieval philosophers. During spermiogenesis, each haploid spermatid develops, without further division, into a functionally mature spermatozoon. Either of two types of cells that originate from the spermatogonium during spermatogenesis and that develop, via division into spermatids. spermatogonium (pl spermatogonia) /sperm-awd-ə-GŌ-nee-əm, pl -nee-ə/ n. subclass (also infraclass, superorder) In taxonomy, a division of a class; specifically, a category ranking beneath a class, but above an order. PICTURE OF SAGITTAL CREST ATOP A GORILLA SKULL sahel /sə-HILL or SAH-hill/ n. A plant, fungus, or microorganisms that feeds on the dead or decaying remains of once living matter; adj: saprophitic /sap-rə-FIT-ik/. For example, biologists still speak of "higher" and "lower" organisms, and think of birds as more "complex" than fish. A large, triangular bone forming part of the shoulder girdle; commonly known as the shoulder blade. scleronyxis (pl scleronyxes) /SKLIR-ō-NIX-əs; pl: -NIX-seez/ n. An anionic surfactant commonly used in biological experimentation, particularly in preparing proteins for electrophoresis in the SDS-PAGE technique. A white, crystalline, water-soluble powder with a saline taste often added to drinking water for the prevention of dental caries. sperm (1) spermatozoa; (2) semen; (3) a spermatozoon. During spermatogenesis, the immature products of the second meiotic division. PHOTOMICROGRAPH staphylopharyngeus /staf-ə-lō-fə-RINJ-ee-əs/ n. starch The storage polysaccharide (a polymer of α-D-glucose molecules) of most plants. Pertaining to or connecting the lower jaw (mandible) and the styloid process. It is also present in many antibiotics, and, in its elemental form is an important fungicide, particularly within the context of organic agriculture. (1) a hard, external, shieldlike plate; in vertebrates scuta may be composed of horn or bone; in invertebrates they are generally chitinous; (2) the largest of the four parts covering the upper surface of the thorax of an insect. second messenger A molecule that relays a message — carried by a hormone from elsewhere in the body to the surface of a cell — to some point within the cell. Any solid material that settles out of a suspending liquid or a gas. sedimentary rock /sed-ə-MENT-er-ee, British: sed-ə-MEN-tree/ n. Expressed sequence tags (ESTs) are STSs derived from c DNAs. CODONS | MOLECULAR STRUCTURE | SERINE BIOSYNTHESIS serous fluid /SIR-əs/ n. Specifically: the three membranes lining the pleural, pericardial, and peritoneal cavities. single nucleotide polymorphism (SNP) /pawl-ee-MORE-fiz-əm/ n. DNA sequence variations that occur when a single nucleotide (A, T, C, or G) in the genome sequence is altered. A block of genes occurring in the same order in two different types of organisms. During the eukaryotic cell cycle, a substage of interphase when each of the chromosomes replicate. systematics (also taxonomy) The study of the classification of living things. In external secretion the substance is not emitted into the blood, whereas in internal secretion it is — secretory /SEEK-rə-tore-ee, see-KREE-tə-ree/ sediment /SED-ə-mənt/ n. sedimentation coefficient (S) /sed-ə-men-TAY-shən co-ə-FISH-ənt/ n. A value indicating the rate at which a particular type of molecule moves through a solution during centrifugation as it settles toward its equilibrium position in the centrifugation gradient. An encapsulated plant embryo in an arrested state of development and, usually, surrounded by endosperm. This is the opposite view from that taken in the theoretical portion of this website, which argues that evolution is typically a matter of selection among distinct, stable types of organisms. STSs are useful for correlating mapping and sequence data reported from different laboratories since they are unique and detectable by polymerase chain reaction. READ ABOUT THE DIET OF SNAKES sessile /SESS-əl/ adj. The first coral reefs formed in the oceans, and fish with movable jaws made their appearance and eurypterids were abundant. single-gene disorder Hereditary disorder caused by a mutant allele of a single gene (e.g., Duchenne muscular dystrophy, retinoblastoma, sickle cell disease).