Settlement and growth of the mussels (Mytilusgalloprovincialis,Lamarck, 1819) on different collectors suspended from an offshore submerged longline system in the Black Sea

A study of spat settlement of a submerged longline mussel culture system was carried out in Sinop area, Black Sea, between May 2008 and May 2009. The effects of six different types of collectors on spat settlement and growth were investigated. Six different types of spat settlement rope were used as polypropylene ropes with 18 mm diameter, 18 mm diameter timeworn silk rope, 22 mm diameter rope made from old hawser (OSR), 22 mm diameter ropes made from old anchovy net without pegs, 18 mm diameter old used nylon ropes and 18 mm diameter tasselled polypropylene ropes. Monthly temperature, salinity, chlorophyll‐a, total suspended matter, inorganic matter and organic matter were determined during the experimental period. The best settlement was observed on the OSR type when measured per metre (3450.00 ± 125.83 ind m^?1). Consequently, the findings showed that settlement preference of spat occurred according to rope structure, and if ropes are designed to combine numerous well‐fixed tassels, spat settlement can increase. Spat growth was affected by environmental factors and rope structure. In addition, the study revealed a negative relationship between density and growth.     

The present situation of freshwater crayfish, Astacus leptodactylus (Eschscholtz, 1823) in Turkey

The only native crayfish species in Turkey, Astacus leptodactylus, is widely distributed in lakes and ponds in many parts of the country. Its distribution area was considerably expanded in Turkey after 1985 because of its commercial importance and declined catches from traditional good fisheries. Although consumption of A. leptodactylus has always been very low in Turkey, it was exported to western Europe until 1986. Due to over-fishing, pollution and a disease (crayfish plague), the total production decreased dramatically to 200 from 5000 tonnes annually. In recent years (1991–1998), there has been a gradual increase in the production of crayfish in Turkey from 320 to 1500 tonnes, but plague is still present.     

Artificial sex reversal of white grouper (Epinephelus aeneus) utilizing aromatase inhibitor (Fadrozole)

The white grouper is a desirable aquaculture species that adapts to captivity, grows well and commands a high market price. However, little is known about reproductive biology or control of sex reversal of this protogynous hermaphrodite. In this study, female white groupers were implanted with one dose of 17α‐methyltestosterone (10 mg/kg body weight [BW], MT) and two doses of aromatase inhibitor, fadrozole (1 and 3 mg/kg BW, FD1 and FD3) once a month for 4 months (April–July). At the start of the study, the fish had gonads full of oocytes compared to the end of the experiment when the control group mature oocytes compared to the experimental groups MT, FD1 and FD3 that exhibited different stages of testicular tissue. Plasma levels of testosterone were significantly highest in the FD3 group and the highest 11‐Ketotestosterone levels were observed in the MT group. Plasma levels of oestradiol (E₂) were significantly lower in the FD implanted groups, compared to initial individuals and control groups. The use of aromatase inhibitor, FD for sex reversal both gives further insight into the mechanisms controlling sex differentiation and provides an alternative to steroid treatment.     

蛋白质组学在癌症研究中的进展

蛋白质组学作为后基因组学时代研究的重要课题,已经广泛深入到了生命科学的各个领域,应用蛋白质学技术寻到敏感性、特异性的癌症标志物,为更好地进行癌症诊断研究提供了良好平台。本文对蛋白质组学的现状和相关研究技术进行了介绍,并概括了蛋白质组学在癌症方面的研究进展。     

家免传染性鼻炎的发生规律

研究了家兔传染性鼻炎与饲养密度，兔笼层次，兔笼摆放位置，饲养方式，季节，家兔品种和年龄的关系，结果表明，该病的发生与环境密切相关，用时存在种间差异，发病率随家兔月龄的增加而提高。提出了控制该病必须重视的环境问题。     

铅锌尾矿渣改良下木本耐性植物的根际环境研究

近年来，木本植物因生物量大、根系发达等特点，被广泛应用于重金属尾矿修复。其中，夹竹桃、栾树、泡桐等品种在铅锌胁迫下，表现出较好的抗性和富集效果。但其对矿渣根际环境的具体影响尚有待明确。本研究取湖南省郴州市某铅锌矿区的矿渣为实验基质，以100%矿渣（CK组）和90%矿渣+5%蘑菇渣+5%碳酸钙（S0组）为对照组；S0组基础上分别种植夹竹桃、栾树、泡桐（S1组）为实验组。通过比较基质的理化性质、有效态Pb和Zn、挥发性有机物、微生物群落结构等指标差异，探究木本耐性植物在铅锌胁迫下的根际环境响应机制。研究结果表明：改良条件下，三种植物能通过基质pH、有机质含量、阳离子交换量、速效氮和有效磷等指标，调节矿渣基质酸碱平衡，从而提高基质持水保肥力。有效态Pb、Zn含量分别下降了16.29%～36.50%和24.50%～47.33%。此外，酯类和酚类等有机化合物种类丰度增加。变形菌门的相对丰度减少，拟杆菌门、放线菌门、慢生根瘤菌属相对丰度增加。综上，改良条件下种植木本植物，改变了基质的理化性质、有机物丰度种类、微生物群落结构，显著降低了矿渣Pb和Zn的生物有效性。     

高产抗病夏大豆新品种皖宿1019的选育与栽培技术

大豆新品种皖宿1019是宿州市农业科学院2009年以郑9805为母本、周02005为父本进行杂交，采用改良系谱法选育而成。该品种2018年、2019年参加安徽省夏大豆区域试验，2年平均产量2574.5kg/hm2，比对照中黄13增产5.78%。2020年生产试验，平均亩产2892.9kg/hm2，比对照中黄13增产8.8%。适宜于安徽淮北地区中等以上肥力地块种植。2021年通过安徽农作物品种审定委员会审定[1][2]（编号：皖审豆20210013）。     

不同镇压强度对燕麦生长特性影响的试验研究

为探究不同镇压强度对燕麦生长特性的影响，设计了一种镇压强度可调的镇压试验装置，分析了镇压轮与土壤之间的相互作用关系，通过受力分析和公式推导，得出了镇压强度与配重的关系；通过田间标定试验，求解了不同镇压强度下试验配重。通过田间试验对燕麦的出苗率、苗期根茎叶干物质积累量、产量等农艺学特性进行了追踪分析，试验结果表明，不同的镇压强度影响燕麦的出苗、苗期生长发育及产量，适宜的镇压强度有助于燕麦生长，当镇压强度为45.71kPa时，燕麦产量最大，为2439.3 kg/hm2，比不镇压时增产13.69%，燕麦的出苗率、苗期根的干物质积累量、茎叶的干物质积累量分别为75.66%、0.90g/10株、5.33g/10株，相比与不镇压时，分别增加了25.66%、36.36%、29.37%。     

First report of Erysiphe salmonii causing powdery mildew on Fraxinus excelsior in Romania

Journal of Plant Diseases and Protection - In October 2020, Fraxinus excelsior saplings showing powdery mildew symptoms on both sides of the leaves were found in Southern Romanian Carpathians....