• 한국식품과학회지
• /
• 제20권3호
• /
• pp.344-349
• /
• 1988

분획(分劃)된 대두(大豆) 7S 및 11S 단백질(蛋白質)은 단백가수분해(蛋白加水分解) 효소(酵素)(alcalase 및 pronase)로 1시간(時間)동안 가수분해(加水分解)하였을 때 사용(使用)된 효소(酵素) 및 단백질(蛋白質) 종류(種類)에 관계없이 pH 5에서 용해도(溶解度), 열응고성(熱凝固性) 및 $Ca^{++}$에 대한 내침전성(耐沈殿性)은 상당히 증가(增加)에멀젼 활성 및 거품 안정성(安定性)은 감소(減少), 에멀젼 열안정성(熱安定性) 및 동점도(動粘度)는 거의 변화(變化)되지 않았다. 그러나 용해도(溶解度)에서 7S 단백질(蛋白質)은 pH 6에서 11S 단백질(蛋白質)은 pH 4에서 감소(減少)하였으며 또한 11S 단백질(蛋白質)은 유흡수성(油吸收性) 및 거품 형함능(形咸能)에서 가수분해(加水分解)에 의하여 증가(增加)하였으나 7S 단백질(蛋白質)은 거의 변화(變化)하지 않았다.

• 대한수의학회지
• /
• 제36권1호
• /
• pp.119-129
• /
• 1996

The present study was conducted to rapidly detect Listeria monocytogenes in raw milk. Specificity and sensitivity of polymerase chain reaction(PCR) technique, and direct PCR were examinded in raw milk, also were compared the calssical culture methods with PCR technique. This method used a pair of primers based on a unique region in the 16S rRNA sequence of L nomocytogenes. In the PCR specificity tests, each of the 10 strains of L monocytogenes tested gave a single 70-bp band. But the other six Listera spp tested gave negative results. Results of the sensitivity tests showed that as few as 2 CFU of L monocytogenes in pure cultures could be detected with 16S rRNA-based primers, L-1 and L-2. In different PCR cycles, a PCR product was detected with $10^3$ cells of L monocytogenes from 25 cycles to 50 cycles and the concentration of PCR products was cycle-dependent. Raw milk samopes added L monocytogenes cells gave negative results. However, these samplers gave a single 70-bp band by pretreatment of pronase, and PCR products were detected with $10^1$ cells of L monocytogenes. To detemine the most sensitive culture protocol to use in conjunction with the PCR assay, raw milk samples were inoculated with L monocytogenes at concentrations ranging from 1 to $5.7{\times}10^4CFU/ml$. PCR assays from Listeria enrichment broth(LEB) containing raw milk samples added L monocytogene EGD could dtect 10 cells in pronase-pretreated samples without incubation, and 1 cell of L monocytogenes in both 12 hr and 24 hr incubation, respectively. Isolation raw of PCR assays was similar to that of classical culture methods, but required time for detection of L monocytogenes could remarkably be reduced compare to culture methods.

• 한국균학회지
• /
• 제39권2호
• /
• pp.117-121
• /
• 2011

각종 버섯에서 항혈전 활성균주를 선별하기 위해 보관 균주 50여종과 임업협동조합에서 분양 받은 20여종의 균주를 대상으로 항혈전 활성을 검색한 결과, 항혈전 활성이 167 sec를 나타낸 상황버섯(Phellinus linteus)을 선별하였다. 본 균주가 생산하는 항혈전 활성의 본체를 파악하기 위해 pronase 처리와 periodate 산화를 행한 결과 pronase로 처리한 시료는 무처리군과 비교하여 차이가 없었던 반면 periodate로 산화시킨 시료는 항혈전 활성이 크게 감소함에 따라 P. linteus가 생산하는 항혈전 활성의 본체는 다당에 기인되는 것으로 추정되었다. 항혈전 생산을 위한 최적 배양조건은 soluble starch 3.0%, peptone 0.1%, $MgSO_4{\cdot}7H_2O$ 0.1%, $K_2HPO_4$ 0.1%, 초기 pH 7.0, 배양온도 $30^{\circ}C$ 및 교반속도 150 rpm이었다. 상기의 최적 배양조건에서 jar fermentor로 10일 배양하였을 때 390 sec의 항혈전 활성과 7.5 mg/mL의 균사체 생육을 나타내었다.

• 한국미생물·생명공학회지
• /
• 제18권1호
• /
• pp.26-30
• /
• 1990

포도에서 분리하여 동정한 Candida dattila K109와 K112 균주는 Kluyveromyces, Hansenula, Debaryomyces, Torulopsis, Brettanomyces속 효모에 대해 killer 활성을 가졌으며, 이들 균주의 최적 pH는 3.9-4.0이고, 최적 온도는 22-26$^{\circ}C$였다. Candida dattila K109와 K112 균주의 toxin은 단백질 분해효소인 pronase E와 pepsin에 의한 killer 활성이 없어졌으며, 2$0^{\circ}C$에서는 비교적 안정하였으나 $25^{\circ}C$ 이상에서는 killer 활성이 급격히 감소하였으며, pH 2.0-4.0 범위에서 비교적 안정하였고 그 이상의 pH에서는 급격히 활성이 저하되었다. 이들 균주의 killer toxin은 gel filtration에 의하여 단백질과 당을 확인하였다. Candida dattila K109와 K112 균주는 0.0105-0.3ppm cycloheximide 처리에 의하여 처리농도가 놓을 수록 killer 활성이 소멸되는 비율이 증가하였으며, 30-37$^{\circ}C$의 가온처리에 의하여 killer활성이 소멸되지 않는 등 기존의 killer 효모의 특성과 다소 다른 특성을 나타내었다.

• 한국가축번식학회지
• /
• 제23권4호
• /
• pp.313-321
• /
• 1999

본 연구는 체외생산된 배반포기배의 vitrification 을 위한 용기로서 glass micropipette(GMP)을 이용할 수 있는지, GMP 와 OPS 로 동결융해 후 생존율의 비교 및 GMP vitrification 후 hatching 율의 향상을 위하여 실시하였다. GMP vessel은 열전도율과 수정란을 포함하는 적은 질량 때문에 OPS 보다 동결 및 융해속도를 높일 수 있다. 3개의 체외수정란을 vitrification 용액에 노출시키고 OPS 또는 GMP vessel에 loading 시킨 후 액체질소에 침적하는데까지 20~25초 이내에 실시하였다. 동결ㆍ융해한 배반포기배는 0.25와 15 M sucrose solution 및 TCM 1999에 각각 5분씩 차례로 희석한 후 10% FCS가 첨가된 TCM 199에 24시간동안 배양하였다. OPS(75.9%)와 GMP(80.0%) 방법간의 re-expanding 율은 유의적 (P＜0.05)인 차이가 없었다. OPS(34.1%)와 GMP(37.5%) 방법에서 hatching 율은 intact group(54.3%) 보다도 유의적 (P＜0.05)으로 낮았다. 비록 GMP straw 당 3개 이하의 blastocysts 를 loading 하였더라도 narrow portion(83.3%) 보다도 wide portion(S6.7%)에서 vitrified 되었다면 re-expanding 율이 유의적 (P＜0.05)으로 낮았다. 비록 30초 처리군과 무처리군 간에는 유의적인 차이가 없었지만 0.05% pronase 용액에 30, 60 및 90초간 처리군 (45.9, 54.7 및 57.5%)의 hatching 율은 무처리구 (35.0%) 보다 유의적 (P＜0.05)으로 높았다. 이러한 결과들은 OPS와 GMP vitrification vessel은 체외생산된 배반포기배의 높은 생존율을 얻을 수 있다. 그러나 GMP vessel은 L$N_2$침적 후 vessel의 floating을 방지하기 위한 또 다른 cap 이 필요하지 않다는 유리한 점을 가지고 있다. 수정란의 loading 위치, 즉 narrow 또는 wide portion에 따라 소 체외 생산된 배반포기배의 생존력에 제한적인 요인으로 고려된다. 0.5% pronase 용액에 60 또는 90초간의 노출은 융해후 hatching 율을 향상시킬 수 있었다.

• 대한치과의사협회지
• /
• 제11권8호
• /
• pp.525-530
• /
• 1973

True collagenolytic enzymes in animal tissues were first demonstrated by Gross and Lapiere (1962), who showed the ability of such an enzyme in the culture medium of living explants of tadpole tissue to degrade a specific substrate of undenatured collagen under physiological conditions. Recently, tumor-associated collagenolytic activity has been demonstrated in human neoplasm and in ascites V Carcinoma. This investigation have been peforme to determine whether or not a collagen lytic enzyme could e found in isolated solid Tawa sarcoma of Donryu female rat obtained the culture medium. The results were as follows. 1. 11.5mg% of hydroxyproline contained in Donryu rat skin collagen, which was extracted by 0.5M acetic acid. 2. Cultivation of solid Tawa sarcoma tissues on reconstituted rat skin collagen gels showed lysis of adjacent gel after 18 hours, and much more extensive lysis after 5 days. 3. Collagen substrate was not attacked by the common proteolytic enzymes, trypsin, pepsin, and pronase.

• Journal of Microbiology and Biotechnology
• /
• 제6권6호
• /
• pp.461-467
• /
• 1996

Four strains of lactic acid bacteria (LAB), that lower the pH of sausage $\leq$ 4.2 within 24 h of incubation at $37^{\circ}C$, were screened from 57 bacteriocin producing LAB which were isolated from kajamie shikhae and natural fermented sausages. The proteinaceous nature of the bacteriocin was confirmed by losing antimicrobial activity after pronase treatment. Inhibitory activity against pathogens, times of bacteriocin production and sensory tests were compared between 4 isolates and 3 commercial starters. Especially, strain NFS #8-1, screened from natural fermented sausage and identified as Pediococcus acidilactici, antagonized a large number of foodborne pathogens including Listeria monocytogenes, Aeromonas hydrophila, Bacillus cereus, Clostridium perfringens, Salmonella typhimurium and Staphylococcus aureus. Production of bacteriocin by strain NFS #8-1 was early in the growth phase (mid log phase) and its sensory acceptance was high. The feasibility of using strain NFS #8-1 as a starter for the production of microbiologically safe fermented sausage is envisaged.

• Journal of Microbiology and Biotechnology
• /
• 제21권2호
• /
• pp.183-186
• /
• 2011

Biochemical methods were selected to evaluate the role of exopolymeric substances in the stability of biofilms used in bioremediation processes. Biofilms of Thiomonas arsenivorans formed on pozzolana were thus treated with pronase (protein target), lectins (Con A or PNA), calcofluor or periodic acid (polysaccharides target), DNase (DNA target), and lipase (triglycerides target). Neither protease nor DNase treatments had any effect on bacterial adhesion. Lectins and calcofluor treatments mainly affected young biofilms. Lipase treatment had a noticeable effect on biofilm stability whatever the biofilm age. Results suggest that it would be an increased resistance of mature biofilms that protects them from external attacks.

• 한국가축번식학회지
• /
• 제11권2호
• /
• pp.127-131
• /
• 1987

This study was carried out to obtain the basic information on splitting and culture of mouse and bovine embryos. Two-, four-, eight-, cell and morula mouse embryos were digested with pronase, splitted in vitro by micro-glass needel with hand, and bovine embryos were splitted by micromanipulator. The splitted embryos were cultured under 5% of CO2 gas in air at 37$^{\circ}C$ for 48-72 hours. The results obtained in this study were summarized as follows: 1. The mouse and cattle were superovulated by 5IU of PMS and HCG, and 2500IU of PMS and 25mg of PGF2$\alpha$, respectively. The average number of embryos after superovulation were 32.5$\pm$8.2 and 7.5$\pm$3:1, respectively. 2. Out of total 122 embryos splitted, the successful splitting rate was 75.0%, 66.7%, 68.4% and 71.4% in 2-, 4-, 8- and morula embryos in mouse, respectively. There was no different splitting rate between mouse(71.4%) and bovine embryos(66.7%) in morula. 3. The successful culture rate of splitted embryos was 68.0% and 67.9% in mouse and bovine embryos, respectively.

• Fisheries and Aquatic Sciences
• /
• 제12권2호
• /
• pp.79-85
• /
• 2009

Gelatin hydrolysates with a high inhibitory activity against angiotensin I-converting enzyme (ACE) were fractionated from Alaska pollock surimi refiner discharge. The ACE-inhibitory activity, expressed as $IC_{50}$ (mg/mL), was highest (0.49 mg/mL) in gelatin hydrolysates formed by sequential 2-hr treatments of Pronase and Flavourzyme. After fractionation through four different membrane filters with molecular weight cut-offs of 3, 5, 10, and 30 kDa, the highest ACE-inhibitory activity (0.21 mg/mL) was observed with the 3-kDa filtrate.