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lactam n.【化學】內醯胺,內酰胺。

lactary

Considering alcaligenes faecalis pencillin g acylase ( afpga ) , which possesses the attractive characteristics for beta - lactam antibiotics conversions , the gene of pga was cloned into two expressing vector pkkfpga and psmlfpga . both the constructed plasmids psmlfpga and pkkfpga contained the pga gene , trc promoter and rrnb transcript terminator , differ in the replicon and antibotic marker , pkkfpga contained multicopy replicon ( cole 1 ) and ampicillin marker . while psmlfpga contained medium - copy replicon ( p15a ) and tetracycline marker 本文將糞產堿桿菌青霉素g酰化酶( afpga )基因構建表達載體pkkfpga和psmlfpga , pkkfpga和psmlfpga均含trc啟動子、青霉素g酰化酶基因、 rrnb轉錄終止子,其中pkkfpga含有氨卞青霉素抗性基因和cole1高拷貝復制子;而psmlfpga含有四環素抗性基因和p15a中拷貝復制子。

D - amino acids as unnatural chiral products are important intermediates in the synthesis of products , such as - lactam semisynthetic antibiotics , antiviral agents , artificial sweeteners , pesticide , peptide hormones , and pyrethroids , etc . though bioconversion of d - amino acids using microbial cells has been realized in industrialization for decades , some limited factors hinder the development of d - amino acid production , and ultimately result in shortage of the raw material in the related industrial fields 目前,用微生物菌體轉化生產d -型氨基酸的工藝路線已經產業化,但天然菌體轉化工藝存在一些限制因素,阻礙了d -型氨基酸的擴大生產,導致產品短缺。因此,利用基因工程菌生物轉化d -型氨基酸已成為世界氨基酸產業的新潮流。

Panipenem and imipenem exhibited comparable in vitro antimicrobial activity , and their activity against gram - negative bacteria such as k . pneumoniae and enterobacter spp was slightly inferior to meropenem , superior to that of ceftazidime , fluroquinolones and - lactam and - lactamase inhibitor combinations 三種碳青霉烯類抗生素體外抗菌作用優于頭孢他啶、 -內酰胺類抗生素與-內酰胺酶抑制劑合劑、氟喹諾酮類等其它受試藥物。

The principle , characteristics and recent applications of - lactam antibiotics are introduced and reviewed . moreover , the application prospects and potentiall for both strategies are evaluated 摘要介紹了在-內酰胺類抗生素酶法合成中兩大策略的原理、各自特點、目前的應用情況,并將其進行了比較,評價了各自的應用前景及開發潛力。

Resistant strains are less likely to develop if a single dose or brief course of a ? lactam antibiotic is administered 大多數常見的病原體為腸道細菌,如大腸桿菌和變形桿菌和假單胞菌。

Mrsa is a type of staphylococcus aureus that is resistant to beta - lactam antibiotics 抗藥性金黃葡萄球菌是金黃葡萄球菌的其中一種,對? - lactam類藥物呈抗藥性。

Mrsa is a type of staphylococcus aureus that is resistant to beta - lactam antibiotics 抗藥性金黃葡萄球菌是金黃葡萄球菌的其中一種,對beta - lactam類藥物呈抗藥性。

The synthesis and sterochemistry of 1 , 5 - benzothiazepines - - amino - - lactam derivatives 內酰胺的合成和立體結構研究