The first is to strengthen water quality control. During this period, the food intake of fish increases, and the increase in excreta can easily lead to deterioration of water quality, resulting in lack of oxygen. Therefore, aerators need to be oxygenated in time every day depending on the weather, water quality, etc. In the event of showers or hot weather, the oxygen aeration time should be extended. It is necessary to constantly add new water, keep increasing the water level, and replace some of the bottom water properly.
The second is to do a good job in disease prevention. Attention should be paid to the prevention of various types of fish diseases. Regular use of lime, chlorine dioxide, dibromohydantoin to disinfect or use microecological agents to improve water quality.
The third is to strengthen daily management and stick to duty on duty. In seasons when the weather is changing, it is necessary to pay close attention to the observation of fish eating and behavior, especially in thunderstorms or hot weather. Oxygen deficiency warning signs (fish floating heads) should be promptly injected with new water and aerators should be opened to avoid pan fish dead fish.
Heavy rains and showers have a great impact on the ecological environment of Penaeus vannamei culture, mainly resulting in instantaneous changes in the water quality (water temperature, salinity, etc.), plankton, and other aquaculture water environments of the shrimp ponds, resulting in a stress response to the shrimps and easily causing outbreaks of the shrimps. Disease. For example, due to the impact of typhoon and heavy rain in 2004, the aquaculture water environment has undergone abrupt changes, which has led to a serious disease of P. vannamei in our city. The lesson is particularly profound. Therefore, Penaeus vannamei farmers should pay particular attention to management during the heavy rain. The first is to maintain a certain water level so as not to affect the salinity in the pool during heavy rain. The second is to open the aerator to minimize the changes in water temperature and salinity in the pool. The third is to disinfect in time, and appropriate oxygenation agents and microbial agents can be applied before sterilization. Fourth, in the feed can be properly added VC, immune enhancers, probiotics, etc. to enhance the prawn physique. Fifth, strengthen the patrol pool and observation, and do a good job of prevention.
Intermediate – Intermediate: A material produced during a drug substance processing step that must undergo further molecular modification or refinement to become a drug substance. Intermediates may or may not be isolated. Intermediates are the key products of the previous process of making APIs, which are different in structure from APIs.
for example:
Amoxicillin capsules are called preparations, amoxicillin is called API, and 6-APA is called intermediate.
Ceftriaxone sodium powder is called preparation, sterile ceftriaxone sodium is called API, and 7-ACA is called intermediate.
Our company specializes in providing key intermediates for various APIs
Intermediate is a very important type of fine chemical products. Its essence is a type of "semi-finished product", which is an intermediate product in the production of certain products. For example, if a product is to be produced, it can be produced from intermediates, saving costs and reducing It is widely used in the synthesis of medicines, pesticides, coatings, dyes and spices. In the field of medicine, intermediates are an important link in the industrial chain of the pharmaceutical industry. They are used for some chemical raw materials or chemical products in the process of drug synthesis. In a word, they are used to produce APIs.
Key Intermediates , Pharmaceutical intermediates , Anticancer intermediates , Antitumor Intermediates
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