You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which among the following microorganism is a gram negative anaerobe? and explain in detail?
Bacteroides species are gram negative bacilli, and are anaerobes. They are a large group of bile-resistant, non-spore-forming, slender rods that may appear as coccobacilli. Bacteria of the genus Streptococcus are Gram-positive cocci typically arranged in chains. Actinomyces are Gram-positive rods characterized by filamentous, tree-like branching growth. Clostridium perfringens is a large, Gram-positive, nonmotile rod with square ends. It grows overnight under anaerobic conditions, producing hemolytic colonies on blood agar. Ref: Brooks G.F. (2013). Chapter 21. Infections Caused by Anaerobic Bacteria. In G.F. Brooks (Ed), Jawetz, Melnick, & Adelberg's Medical Microbiology, 26e.