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Blackout A temporary loss of vision or consciousness.

Blackwater Fever A type of malaria characterized by the profound hemoglobinuria.

Bladder 1. A hollow sac serving as a receptacle for fluid or gas. 2. The urinary bladder.

Blanex A trade name for a combination drug containing chlorzoxazone and acetaminophen.

Blank A solution or a mixture of reagents that excludes the sample.

-blast A suffix meaning an embryonic state.

Blast Cell A precursor of a red blood cell in the earliest stage of development.

Blast Cell Transformation The differentiation of T lymphocytes to a larger, cytoplasmic-rich lym-phoblast.

Blastema A group of cells that is capable of developing into an organized structure during regeneration or forming a new organism by asexual reproduction.

Blasticidin S (mol wt 422) A nucleoside antibiotic produced by Streptomyces griseochromogenes.

COOl nh2 o

Blastin Any substance capable of stimulating the growth or proliferation of cells.

Blasto- A prefix meaning embryo.

Blastobacter A genus of rod-shaped to spherical, Gram-negative, budding bacteria occurring in ponds and lakes.

Blastocel The large central cavity of an embryo at the blastula stage.

Blastocoele Variant spelling of blastocel.

Blastocrithidia A genus of homoxenous parasitic protozoa (family Trypanosomatidae), which occurs in the gut of bugs and mosquitoes.

Blastocyst The embryo at the time of its implantation into the uterine wall; it gives rise to the tissues and organs of the developing mammalian organism.

Blastocystis A genus of protozoa (formerly known as fungi of Entomophthorales).

Blastocyte An undifferentiated very early embryonic cell.

Blastocytoma A tumor of undifferentiated or embryonic tissue.

Blastoderm The layer of cells forming the wall of the blastocyst in mammals and the blastula in lower animals during the early stages of embryonic development.

Blastodisc A disc-shaped layer of cells formed by the cleavage of a large yolky egg. Mitosis within the blastodisc produces the embryo.

Blastogenesis The production of blast cells caused by mitogen activation.

Blastokinin A protein secreted by the uterus in many mammals that stimulates and regulates the implantation process of the blastocyst in the uterine wall.

Blastolysis Destruction of a germ cell or blastoderm.

Blastoma A tumor consisting of undifferentiated or embryonic tissue.

Blastomatosis The development of tumors from embryonic tissue.

Blastomere A daughter cell resulting from cell division or cleavage of the fertilized egg.

Blastomyces A genus of fungus (Hyphomycete) that causes blastomycosis.

Blastomycosis An infectious skin disease caused by fungus Blastomyces dermatitidis.

Blastophthoria Destruction of germ cells.

Blastospore A spore produced by a budding process along the mycelium.

Blastula A hollow sphere structure enclosed within a single layer of cells that occurrs at an early stage of development in various animals.

Blastulation Formation of blastocyst or blastula.

Blattabacterium A genus of Gram-negative bacteria that occur as intracellular endosymbionts of the cockroach (Blatta species).

Bleaching 1. Loss of the chromophore or pigment from a biological organelle or loss of pigment(s) from an organism (e.g., loss of chlorophylls from a photosynthetic microorganism). 2. To whiten a textile or paper.

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