using System

# import 〈System〉

uses System

# include 〈System〉

体现研究的复杂性

保证一定的样本量

排除研究中的干扰因素

保持研究对象的多样性

We’ll check all the employees in addition to the requirements of common people

We’ll raise the demands for VIP protection

VIP protection is so important that we have to screen employees

We’ll screen all the employees according to the requirements of VIP protection

using System;

# import ;

uses System;

# include ;

目标职能

计划职能

组织职能

领导职能

A．using System;

# import ;

uses System;

# include ;

Some key cellular functions are regulated by enzymes that use NAD + not as a redox cofactor but as a substrate in a coupled reaction in which the availability of NAD + can be an indicator of the cell’s energy status.

A family of proteins called sirtuins regulate the activity of proteins in diverse cellular pathways by deacetylating the ε-amino group of an acetylated Lys residue. The deacetylation is coupled to NAD + hydrolysis, yielding O -acetyl-ADPribose and nicotinamide.

NAD + also plays an important role in cholera infections. Cholera toxin has an enzymatic activity that transfers ADP-ribose from NAD + to a G protein involved in regulating ion fluxes in the cells lining the gut. This ADP-ribosylation blocks water retention, causing the diarrhea and dehydration characteristic of cholera.

Both nicotinic acid and nicotinamide cure pellagra.