The immune system is a system of many biological structures and processes within an organism that protects against disease. To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms, and distinguish them from the organism's own healthy tissue.he ability of the immune system to respond to pathogens is diminished in both the young and the elderly, with immune responses beginning to decline at around 50 years of age due to immunosenescence. In developed countries, obesity, alcoholism, and drug use are common causes of poor immune function.
Yes, a 32-bit architecture is limited to addressing a maximum of 4 gigabytes of memory. Depending on the operating system, this number can be cut down even further due to reserved address space. This limitation can be removed on certain 32-bit architectures via the use of PAE (Physical Address Extension), but it must be supported by the processor.
I've recently built a new PC with 8GB of RAM installed on the motherboard (2 sticks of 4GB). The operating system is Windows 7 Ultimate 32-bit. When checking over my specifications, everything was in order apart from the RAM which stated 8GB was installed, but only 1.92GB were usable.2-bit Win 7 can use between 3 and 4GB of RAM, usually around 3.6GB. 64-bit should be able to use the whole 8GB. The fact that you're only using 1.9GB suggests that part of your RAM is being used by the system for something else.