Nghiên cứu được thực hiện nhằm phân lập, định danh, xác định một số đặc điểm bệnh học và sinh trưởng của vi khuẩn Flavobacterium columnare gây bệnh trên cá rô phi nuôi ở miền Bắc. Tổng số 138 mẫu cá rô phi nghi nhiễm F. columnare đã được thu từ 34 đợt xuất hiện bệnh ở 21 trại nuôi của 3 tỉnh Hòa Bình, Hà Nam và Hải Dương. Kết quả cho thấy, cá rô phi nhiễm bệnh có biểu hiện đặc trưng như xơ, bạc mang, xuất hiện đốm bạc trắng trên da, xơ vây. Bệnh có thể xuất hiện quanh năm, nhưng tập trung và gây thiệt hại nhiều ở vụ đông xuân. Tỷ lệ chết ở các ao bị bệnh dao động 5-35%. Tổng số 87 chủng vi khuẩn thuần đã được phân lập thành công từ mẫu cá bệnh, 34 chủng đại diện (1 chủng/1 đợt xuất hiện bệnh) đã được định danh thành công bằng hình thái, đặc tính sinh hóa và kỹ thuật PCR. Các chủng vi khuẩn phân lập được trên môi trường TYES có khuẩn lạc màu vàng, dạng rễ cây, phát triển sau 36-48 giờ nuôi cấy. Vi khuẩn F. columnare thuộc nhóm gram âm, dạng sợi mảnh, di động trượt, dương tính với phản ứng catalase, oxidase, có khả năng hấp thụ thuốc nhuộm red congo, tạo sắc tố vàng nâu từ phản ứng flexirubin. Vi khuẩn F. columnare phát triển tốt khi nuôi cấy ở nhiệt độ 25-28°C, pH 7-8 và độ mặn dưới 5‰. Kết quả nghiên cứu cung cấp thông tin quan trọng hỗ trợ xây dựng biện pháp phòng và điều trị bệnh do F. columnare trên cá rô phi. Link bài báo tại đây

Flavobacterium columnare

PGS. TS. Trương Đình Hoài – Nhóm NCM Bệnh Thủy sản

Bài viết được trích nguồn từ: khoathuysan.vnua.edu.vn

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  • Địa chỉ: Cụm CN Liên Hiệp – Phúc Thọ – Hà Nội
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6 bình luận về “Nghiên cứu phân lập và một số đặc điểm bệnh học của Flavobacterium columnare gây bệnh trên cá rô phi (Oreochromis spp.) tại miền Bắc, Việt Nam

  1. steroid risks cho biết:

    There can additionally be in depth and everlasting disruption of
    normal sexual operate on account of long run or heavy use.
    The regulation of anabolic steroids is also reflected within the insurance policies of assorted
    sports activities organizations. Many competitive sports activities have strict anti-doping regulations that prohibit using steroids.
    Athletes discovered to be utilizing these substances
    face severe penalties, including disqualification and bans.

    Inform your doctor or nurse when you have headaches,
    nosebleeds, blurred or double imaginative and prescient or shortness of breath.

    They examine your ranges of blood cells and other substances within the blood.
    Your healthcare group could offer you a small card to carry with you while you are taking steroids.
    This is in order that anyone else treating you, corresponding
    to your dentist or in an emergency, is conscious of
    that you’re on steroids. The quantity (dose) and length of steroid remedy is different
    depending on why you are having steroids.
    Under the UK legislation, anabolic steroids are categorised as class
    C medicine beneath the Misuse of Drugs Act 1971.

    This implies that whereas it’s authorized to possess anabolic
    steroids for personal use, it’s unlawful to supply them to others, whether for cash or freed from charge.
    Importantly, this legal framework goals to control the misuse of those substances while permitting individuals to use them
    for respectable purposes, corresponding to medical therapy.

    Even a single anabolic androgenic steroid risks administration in subjects so weak to hormonal
    change could adversely have an result on cognitive processes such as learning and memory (Ramos‐Pratts et al., 2013).
    Customers are aged over 18 at the time of first use (Chandler
    & Mcveigh, 2013), but use amongst adolescents has been recognised (Brennan et
    al., 2016; Eisenberg, Wall, & Neumark‐Sztainer, 2012; Ip et al.,
    2012). This is low compared to findings elsewhere, the place as a lot
    as 5.9% of teenage faculty boys had been reported to have tried anabolic androgenic steroids
    (Eisenberg et al., 2012; Heimly Jenssen & Johannessen, 2015).

    The UK authorities has carried out various measures to manage using
    anabolic steroids.
    MART includes utilizing one single mixture inhaler, as an alternative of separate
    preventer and reliever inhalers. Other inhalers containing completely different medicines may be blue too so you will need to verify the label.
    It’s a worrying time for many individuals and we want to be there for you each time – and wherever – you want us.
    Cancer Chat is our totally moderated discussion board where you’ll find a
    way to talk to others affected by most cancers, share experiences, and get assist.
    You have common blood tests all through your remedy so your
    physician can verify this. This drug can cause inflammation of the pancreas (pancreatitis).
    Inform your doctor immediately when you have sudden and severe ache in your tummy (abdomen).

    Steroids, additionally referred to as corticosteroids, are anti-inflammatory medicines used to deal with a variety of conditions.
    A excessive dose of inhaled steroid over a very long time may be a threat issue
    for creating osteoporosis. You might help to forestall osteoporosis by taking common train, not smoking, sustaining
    a healthy weight and consuming a diet with sufficient calcium.
    The MDI has been used for over 40 years and is used to ship varied varieties and types of bronchial asthma medicines.

    The steroids in your inhaler prevent certain kinds of inflammation from increase in your airways.
    Find out why steroids are used to deal with lung circumstances like asthma
    and persistent obstructive pulmonary illness
    (COPD). When it involves common anabolic steroids like
    testosterone, it’s usually legal to take them.
    Nevertheless, making and selling this chemical with out permission from regulatory our bodies is against the law.
    Local anaesthetic and corticosteroid injections are generally performed and are
    typically protected. Nonetheless, to make an knowledgeable decision and
    provides your consent, you want to bear in mind of the possible side effects and dangers or problems.

    The medication in a reliever inhaler relaxes the muscle in the airways which
    opens the airways wider,. However your sugar levels usually return to normal shortly after you cease taking steroids.
    They are a treatment for many totally different situations
    and ailments.

  2. People Who Use Steroids cho biết:

    No steroid is considered protected to make use of for
    efficiency enhancement, and the dangers to your health are well-known. With Dianabol, the risks are at
    the serious end, as they relate to your liver, cholesterol,
    and total heart well being. These risks are reduced by limiting a Dianabol cycle to 6 weeks and avoiding high
    doses past 50mg per day. The main trigger of those opposed effects is Dbol’s 5-alpha
    reductase enzyme metabolization.
    However, warning have to be exercised, as we’ve seen hepatic issues arise from high
    dosages and extreme cycles. CrazyBulk’s formulas are supported by medical analysis and are protected
    for women and men to use. Regardless Of orals being extra convenient and easier to take, there are drawbacks to
    taking drugs, which shall be detailed in the side effects
    part. We have seen users add 30 pounds to their bench press
    within the first 10 days on Anadrol. If you undergo from hypogonadism and require testosterone
    for medicinal purposes, we advocate Olympus Men’s testosterone substitute therapy (TRT) program.

    It’s like they’re taking part in a high-stakes recreation of Jenga together with your mood, pulling out blocks
    right here and there till the whole structure turns into unstable.
    Rising old is often a daunting idea for some people,
    however that shouldn’t take away from experiencing life’s adventures.
    Dianabol and testosterone could be stacked collectively
    for enhanced results in comparability with taking either compound alone.
    However, the degree of estrogen and androgen-related
    unwanted aspect effects will be extra severe. We have seen women avoid virilization unwanted side effects when taking Dianabol in low
    doses; however, with trenbolone, masculinization is extra more likely to occur.

    Due to the nature of such a purchase, if you’re to stay within the safety of the
    legislation you may be inspired to go to the sponsors here at Steroid.com.
    Currently, the Oxymetholone hormone is simply
    accredited in the united states for the remedy of
    anemia, as properly as muscle losing diseases like HIV and AIDS.
    The compound can also be not manufactured by Park
    Davis & co. and Syntex would sell its proper to Unimed
    Pharmaceuticals in the late 1990’s ultimately finding its
    way to Alevan Pharmaceuticals in 2006. Of all the main oral anabolic steroids on the market, anapolon makes a
    poor alternative for examined athletes because its detection time
    is a hefty 2 months.
    Anadrol does trigger testosterone suppression, and you will need post-cycle remedy after using this steroid.

    Since most people will comply with up on Anadrol with
    injectable steroids, your PCT would then solely be implemented when you cease all other suppressive compounds.
    With Out PCT, it will be troublesome to keep up muscle features made with
    Anadrol, as low testosterone causes catabolic activity (loss of muscle mass).
    One of its medical makes use of is to deal with muscle wasting, so it excels
    in this space. Anadrol supercharges protein synthesis, nitrogen retention, pink blood cell product, and testosterone.
    Put all this stuff collectively, and you’ve obtained the ultimate mass-gaining compound.
    At larger doses, you’ll almost certainly undergo
    extreme water retention, which is not solely ugly however, more importantly, can elevate blood pressure
    to harmful ranges.
    If you were to wait for your muscles to repair themselves before resuming your sport, you would possibly as well find yourself lacking one or two periods.
    Scientists how used this understanding of the naturally
    produced HGH to manufacture it artificially.
    HGH used by bodybuilders is a very robust peptide hormone with 109 amino acids.
    It supplies the physique with numerous anabolic properties that allow it to hold out particular physiological
    features.
    My mood got fairly dangerous on Anadrol and it didn’t seem like the
    strength features have been relative to the unwanted facet effects on it.
    But I’m not all People Who Use Steroids and there are certainly
    many individuals who reply very well to Anadrol.

    Anadrol is not an ideal cutting steroid because of the quantity of water retention it causes.
    This is the other of what you want in a chopping cycle,
    where you purpose to attain a really outlined and vascular physique.

    Nonetheless, customers right now seeking bigger enhancements in muscle hypertrophy usually take the next dose.

    As Quickly As endogenous testosterone has been restored, if a consumer needs to proceed taking AAS, we
    have discovered hCG to be efficient at maintaining fertility in doses of 500 IU each other day.
    Dianabol customers also can experience low libido, decreased well-being, melancholy, lower ranges of vitality, and erectile dysfunction when testosterone ranges
    plummet.
    As an added bonus, this is doubtless certainly one of the most inexpensive steroids on earth.
    Demand is excessive, but so is the provision and competition, and this retains the
    value down. In truth, you possibly can simply purchase 1,000 5mg British Dispensary Anabol tablets, one of
    the frequent and notable manufacturers on earth for as little as $100.
    Other popular brands include Russian Dbol METAHAPOCTEHOROH
    by Akrikhin (Akpnxnh), Naposim by Terapia and Anahexia by Jinan Prescription Drugs.
    You will also discover numerous underground labs carry high dose Dianabol capsules.

    Most Dbol tablets will usually be present in 5mg and 10mg energy, but capsules are frequent in 25-50mg energy.

  3. nkstraatmuzikanten.nl cho biết:

    Deca just isn’t androgenic in comparison, so we find it to be
    one of the optimum anabolic steroids for inhibiting
    DHT (dihydrotestosterone) levels and preserving hair follicles intact.
    It is also necessary to note that tren is significantly more androgenic than Deca; thus, we usually see customers stay
    lean and burn more fats when utilizing tren cycles.
    Customers will also seem leaner on tren, as it has
    diuretic qualities compared to Deca Durabolin, which typically causes water retention. In distinction, other anabolic steroids sometimes
    lower subcutaneous fat but enhance visceral fat (VF), typically leading to a bloated look (despite being lean).

    Testosterone is an important hormone to the
    physique; in-fact, as the primary androgen it is among
    the most important hormones we ever produce and is important to a well-functioning body.
    When our testosterone levels turn out to
    be too low, we will undergo in numerous ways
    that revolve across the physical and mental sense, in addition to our direct sexual operate.
    Due to these information, in case you are steroiding
    with anabolics treatment must be utilized and the only answer that is smart is testosterone; in any case, it is the hormone you’ll now be lacking in. Edema
    wasn’t a difficulty and a substantial enhance in lean physique mass was seen along with a moderate discount
    in fats mass. This was probably one of the lowest by way of folks
    reporting the “really feel effect.” In common,
    most did not report any shocking strength increases.
    Yes, anabolic steroids can have notable immunosuppressive results in medical analysis (6).
    We have also observed abnormal IgG antibody levels in a number of
    of our sufferers.
    The outcomes males can anticipate will once more closely depend on the aim
    of use. Unlike standard AAS cycles, you can’t put a determine on expected positive aspects with HGH as a end result
    of it will improve your steroid cycles somewhat than acting as a standalone muscle builder.

    If you’re taking doses of 8iu or extra, splitting it into two day by day injections is not unusual.
    Avoid injecting within the hours before sleeping as a end result of that may be a
    time when your physique is ramping up its natural growth hormone manufacturing.
    I like to inject after breakfast (after eating some carbs) – this may help keep away from fatigue or drowsiness.

    They improve their dosage from 500 mg to 800 mg weekly
    (not really helpful for novices and intermediate users).
    The steroid is one type of natural substance that
    accommodates numerous types of hormones and nutritional vitamins.
    And, when it’s about constructing a bulking physique for
    bodybuilding and athletic fields, we’re going to
    discuss anabolic steroids that embody artificial androgens derived
    from Testosterone with pure substances. It boosts muscle development in addition to reduces fats and gives you
    a bulking determine. The story of steroids will get popular
    with its utilization in sports activities, particularly in bodybuilding fields.

    Dianabol, created by Dr. Ziegler, is less androgenic than testosterone however more anabolic.
    When treating gynecomastia, we now have had success with selective estrogen receptor
    modulators (SERMs), corresponding to Nolvadex, to forestall breast tissue accumulation. Since testosterone cypionate was formulated,
    we now have seen it turn into extra regularly used
    than enanthate in the US because of its restricted availability worldwide.
    Moreover, cypionate injections could present much less irritation than enanthate for some customers.
    Enanthate and cypionate are the 2 most common types of testosterone, made up of longer esters which
    may be slower to take effect. In order to reduce the effects of gynecomastia,
    a SERM such as Nolvadex could also be utilized on-cycle when the nipples start to swell.

    Human chorionic gonadotropin (hCG) and Clomid are often sufficient to recuperate endogenous testosterone manufacturing, often inside 1–2 months.
    Failing to manage PCT may end in users experiencing low testosterone signs for several months.
    Water retention is type of sure with testosterone and Dianabol,
    inflicting bloating and a clean appearance to the muscular tissues.
    Due To This Fact, we see this cycle generally taken through the low
    season when a person is optimizing for mass as a substitute of aesthetics.
    However, our patients typically utilize post-cycle therapy (PCT) to
    shorten this time, which additionally benefits them psychologically, bettering their well-being.

    Endogenous testosterone recovery is not assured if an individual abuses the steroid long-term.

    The truth is that the majority of anabolic steroid use info,
    cycle protocols, PCT (Post Cycle Therapy) issues, and lots of extra frequent pointers merely do not apply to feminine anabolic steroid users.
    Most individuals understand what a beginner is; somebody who’s new to an endeavor and is collaborating
    in it for the first time or whereas they may have already taken part are nonetheless somewhat
    contemporary. For the anabolic steroid person this is someone who has never supplemented before or
    who solely has a couple cycles beneath their belt; this can be a newbie.
    The intermediate degree is slightly more durable
    to define as there is no set in stone one measurement suits all reply to
    determine if one is on the intermediate stage.

    We can say you must have a minimum of one cycle that has been completed and most can be greatest served
    if they’ve completed no less than two. If you’ve completed two
    cycles does this imply you’re prepared for an intermediate level?
    Many performance enhancers will be just fine with beginner style cycles every time they supplement but for lots
    of others, as is usually the case in life, many will want
    somewhat more.
    When implementing the aforementioned cycle, you will need
    to frequently monitor ALT and AST liver enzymes, as both compounds are C-17 alpha-alkylated.
    Due to its mass-building capabilities, testosterone is
    mostly thought to be a bulking steroid. It could be the
    most optimum low season compound because of it demonstrating important anabolism with out high levels of cardiotoxicity.

    Another important mistake many make is ignoring signs of adverse
    reactions. Nevertheless, I brushed them off, thinking they
    had been simply part of the method. Understanding your body and recognizing when something feels
    off is vital to your well being and health journey.
    The DSM-5 by the American Psychological Affiliation treats AAS
    abuse as a critical condition.
    Whichever kind you take, you’ll obtain the same results by the end of the cycle.
    As with all anabolic androgenic steroids, you’ll have
    the ability to anticipate unwanted effects to be a giant focus of your use
    of Winstrol. On the constructive side, it is a non-aromatizing best steroid for
    mass gain (nkstraatmuzikanten.nl); you won’t worry about water retention and gyno.
    However with suppression of your pure testosterone production, you possibly can expect to see some predictable
    unwanted side effects.

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