英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:

cephalosporin    音标拼音: [s,ɛfəl'ɔspɚɪn]
先锋霉素

先锋霉素

cephalosporin
n 1: one of several broad spectrum antibiotic substances
obtained from fungi and related to penicillin (trade names
Mefoxin); addition of side chains has produced
semisynthetic antibiotics with greater antibacterial
activity [synonym: {cephalosporin}, {Mefoxin}]

Lactam \Lac"tam\, n. [Lactone amido.] (Chem.)
One of a series of anhydrides of an amido type, analogous to
the lactones, as oxindol; a cyclic amide.
[1913 Webster]

{beta-lactam} or {[beta]-lactam},
(a) a lactam in which the amide bond is contained within a
four-membered ring, which includes the amide nitrogen and
the carbonyl carbon.
(b) an antibiotic containing a beta-lactam, such as a
{penicillin}, {cephalosporin}, or {carbapenem}; also
called a {beta-lactam antibiotic}. [informal, laboratory
slang]
[PJC]


Cephalosporin \Ceph"a*lo*spor`in\
(s[e^]f"[.a]*l[-o]*sp[=o]r`[i^]n), n. [from Cephalosporium, a
fungus producing the first of the series discovered.] (Chem.)
any of a class of chemical substances, some of which have
therapeutically useful antibacterial activity, whose
structure contains a beta-lactam ring fused to a six-membered
ring containing a sulfur and a nitrogen atom. The first of
the series, {cephalosporin C}, was discovered by G. Brotzu in
1955 in the culture broth of a {Cephalosporium} species found
off the coast of Sardinia. Other cephalosporins have been
found to be produced by species of soil bacteria
(actinomycetes). Many semisynthetic analogs have been tested
for antibacterial effect, and several of them have found use
as important clinically useful antibacterial agents, some of
which may be taken orally for treatment of bacterial
infections. The cephalosporins are the second class of
beta-lactam antibiotic to be discovered, the first being the
{penicillins} and more recent classes being the
{thienamycins} and {sulfazecins}. The {cephamycins} are a
variant of cephalosporins with a methoxyl group on the
beta-lactam ring, rendering them more resistant to
penicillinases. Among the cephalosporins which have been
found clinically useful are {cephalexin}, {cephaloridine},
and {cephalothin}.
[PJC]


请选择你想看的字典辞典:
单词字典翻译
cephalosporin查看 cephalosporin 在百度字典中的解释百度英翻中〔查看〕
cephalosporin查看 cephalosporin 在Google字典中的解释Google英翻中〔查看〕
cephalosporin查看 cephalosporin 在Yahoo字典中的解释Yahoo英翻中〔查看〕





安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Top 18 Paid Social Media Agencies for 2025 | Growth Hackers
    Top paid social media agencies excel in crafting compelling and persuasive ads Whether producing engaging videos, designing stunning graphics, or collaborating with influencers, these agencies have the expertise to create impactful creative content that resonates with your target audience Certifications from Leading Social Platforms
  • Top 20 Paid Social Agencies In The US 2025 - LYFE Marketing
    Find the best Paid Social Agencies in the US We have listed the top 20 paid media companies that can drive results for your business in 2025
  • Top 13 Paid Social Media Agencies In 2025 - thefrankagency. com
    Explore the top 13 paid social media agencies of 2025 Learn how these experts deliver effective campaigns on Facebook, Instagram, LinkedIn, TikTok, and more
  • Top Paid Social Media Agencies (2025 Rankings)
    In this guide, we’ve researched and ranked the top paid social agencies across the U S These aren’t just agencies with flashy portfolios—they’re trusted by brands to deliver real performance and long-term results
  • Top 22 Paid Media Agencies Reviewed in March 2025 - Jake Jorgovan
    As marketing grows in popularity, there are many new paid media agencies emerging And it’s also getting harder to choose the right agency for your business Because of that, I’ve done the research and compiled a list of top paid media agencies in the game
  • 18 Top Paid Media Agencies: Finding the Right Partner for 2025 - inBeat
    In this piece, we'll explore the top paid media agencies that have consistently proven their ability to generate results From micro-influencer marketing to PPC management, these agencies excel in different areas to meet your unique business needs 1 inBeat:
  • Top 19 Social Media Marketing Agencies in 2025 - blog. udonis. co
    Megaphone is one of Australia’s top social media agencies, helping eCommerce and DTC brands scale through paid and organic social They’re known for fast-moving campaigns, creative testing, and a strong focus on conversions Their team handles everything in-house – from video ads and copywriting to targeting and performance tracking
  • Best Paid Social Media Agencies for 2025 – Full Guide
    These firms are reshaping how performance marketing is delivered across social platforms in 2025 Below are the Best Paid Social Media Agencies in 2025 (Top 5 Global Firms Ranked), featuring standout players from New York to Stockholm 1 AWISEE – The Smartest Paid Social Media Agency in 2025 Services:
  • 21 Best Paid Social Agencies of 2025 - joseangelostudios. com
    Selecting the right paid social agency can significantly enhance business growth in 2025 and beyond The top agencies highlighted in this list demonstrate diverse capabilities, from influencer partnerships and targeted campaigns to creative content strategies and data-driven results
  • Best Paid Media Agencies for Your Business in 2025
    Paid media agencies serve as invaluable partners in your journey toward online advertising success With their vast expertise, innovative methodologies, and cutting-edge digital marketing tools, these agencies can significantly enhance your brand's visibility, customer engagement, and return on investment





中文字典-英文字典  2005-2009