The point pattern analysis and age-classes of Acer pectinatum and Betula utilis populations along the elevation gradients in Meili snow mountain

Mixed coniferous-broadleaved forests are typical types of vegetation in northwest Yunnan. It is meaningful to analyze the spatial patterns for its important function on protecting biodiversity and depicting the ecological processes of mixed coniferous-broadleaved forests.

To reveal the mechanisms of species coexistence of mixed coniferous-broadleaved forests in Meili snow mountain, method of point pattern analysis was used in this study. This study researched age-classes, spatial distribution patterns and associations of Acer pectinatum and Betula utilis populations with elevation from 2850 to 3250m. The results of the study were as follows: (1)Along the elevation gradients, the age-classes of Acer pectinatum populations basically had no obvious changes, and the aggregation degree of Acer pectinatum populations gradually increased; (2) Along the elevation gradients, the age-classes of Betula utilis populations obviously changed, and the aggregation degree of Betula utilis populations was the highest in mid-elevation(3050m) area; (3) Along the elevation gradients, the spatial associations of Acer pectinatum and Betula utilis had an obvious change. In low elevation(2850m) area, the spatial associations of Acer pectinatum and Betula utilis was positive. In mid-elevation(3050m) area, the spatial associations of the two species changed from no association to negative associations. In high elevation(3250m) area, the spatial associations of the two species changed from no association to positive associations.

The study showed that, In Meili snow mountain area, elevation has an obvious influence on spatial patterns and spatial associations of species; In different elevation area, one species may form different populations with different age-classes, and age-classes of populations may have an influence on spatial patterns and spatial associations of species.

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How to reasonably make use of nature reserves?

With the development of society and economy, the environmental damage caused by human has resulted in the fragmentation of habitat, the threatening on biodiversity, and the serious influences on the structure and function of ecosystems. Nature reserves, as the most effective measure for protecting biological resources, are getting more and more attention. However, to give play to this measure to make benefits for mankind, it is needed efforts on many aspects.

Firstly, it is suggested to strengthen the background investigation on the biodiversity in the reserves and prefect the basic data of the reserves to improve data accuracy. Data provide foundation and supports for the protection, monitoring, and scientific researches on the nature reserves. This study found that the information contained in existing data is insufficient and the data of the reserves are inconsistent. Thus it is needed of strengthening the collection and improvement on the basic data.

Secondly, increasing the protected area of the vegetation types with small protected area and accelerating the type supplementation of nature reserves. According to the equilibrium theory of island biogeography, the larger the reserve area, the more the protected species. Of course, it is not recommended to blindly apply this concept to the protection practice of biological species. Therefore, considering the human survival, life, and economic factors, it is necessary to formulate more reasonable and detailer protection plans and determine the vegetation types with less protection and severe damage by analyzing the real situation.

Thirdly, reducing human interferences. Human interferences, which are increasingly intensive under the urgent need of rapid development and the pursuit for economic interests, greatly threaten the current biodiversity. It is of great significance to determine how to increase economic income and obtain win-win in premise of reasonable utilization on the resources in the reserves.

Finally, seeking for efficient protection strategy, perfecting protection mechanisms, and increasing staffing. The establishment of reserves is targeted for more effective protection.

However, establishment is not the end. Subsequently, focus should be put on the legislation of the nature reserves to further strengthen the legal status of nature reserves. In addition, professional staffing should be improved to effectively give play to the value of nature reserve. Environmental protection needs everyone to take part in.

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Gene editing will be more efficient owing to RNA-based drugs

CRISPR/Cas9, a way to use a naturally occurring bacterial system, has been found by researchers for several years to inactivate or correct specific genes in any organism. Though the CRISPR/Cas9 gene editing activity works continuously, it results in risk of additional editing at unwanted sites. Recently, scientists from University of California, San Diego School of Medicine, Ludwig Cancer Research and Isis Pharmaceuticals showed a way to use RNA to turn the CRISPR-Cas9 system on and off as wished: permanently editing a gene, but only temporarily activating CRISPR-Cas9. They published the new study in the National Academy of Sciences November 16. The study provides a platform for multiple therapeutic applications, especially for nervous system diseases, using successive application of designer CRISPR RNA drugs. They design a RNA which acts as a guide role to match the sequence of a specific target gene. The RNA guides the Cas9 enzyme to the desired site, where it cuts the DNA. The cell will repair the DNA break imprecisely, thus inactivating the gene. As an alternative, researchers can coax the cell into replacing the section adjacent to the cut with a healthier version of the gene. Now they are testing the CRISPR/Cas9 system in various applications to repair defective genes which cause disease. Above is the workflow of CRISPR/Cas9 system. This new way provides RNA-based, chemically modified drugs to transiently activate the CRISPR/Cas9 gene editing system. Though the activity is transient, the editing stops when the guiding RNA drug is cleared. An extension of the way can turn off the molecular scissors faster by addition of a second, chemically modified RNA drug that directs inactivation of the gene encoding the Cas9 enzyme. In conclusion, the RNA-based drugs shown in this study have so many advantages over the present CRISPR/Cas9 system in efficiency and selectivity. What's more, they can be synthesized in a short time on an industrial scale with strong commercial feasibility. Know more about CRISPR/Cas9 tools and other gene priducts here>>>http://www.cusabio.com/Recombinant-Protein/Recombinant-Homo-sapiens-Human-T-cell-surface-glycoprotein-CD8-alpha-chain-11090032.html

The importance of the research on C-reactive protein

As we know that C-reactive protein (CRP) is an annular (ring-shaped), pentameric protein found in blood plasma, whose levels rise in response to inflammation. It is a typical acute phase protein of inflammation. The concentration of CRP can raise more than 1,000 times in the acute condition. CRP is mainly expressed in hepatic cells and secreted to the plasma. At present, CRP can be used as a nonspecific marker of inflammation in clinical test. It was proved to be a predictor of athereosclerosis these years. The basal level concentration of CRP in plasma is related to the risk of atherogenesis. However, the precise function of CRP is not clear so far in inflammationary regulation and atherogenesis. So the current situation of C-reactive protein and the research on it is quite important. Extended reading recommended for you>>>http://www.cusabio.com/Recombinant-Protein/Recombinant-mouse-Glucagon-like-peptide-1-receptor-11089633.html

New method to identify to find Reproducible Drug-resistance-related Desregulated Genes

In microarray experiments for comparing gene expression profiles of two groups of cell lines, one of the most popular experimental designs is to measure only a few (e.g., two or three) technical replicates and detect differentially expressed genes by FC with a cutoff value. Apparently, genes with high expression levels in one group are hardly to be identified to be desregulated and genes with low expression levels tend to have large FC introduced by random measurement fluctuations. Besides, the cutoff value is usually arbitrarily. Therefore, it is necessary to evaluate the character of methods that commonly used in small cell line datasets and develop some new methods which are suitable for these datasets. PD algorithm proposed in this paper can identify significantly reproducible DE genes with a stringent FDR on 4 small resistant-sensitive cell lines datasets and significantly enriched in many biological pathways known to be related with drug resistance of the corresponding drugs. SAM and RP could identify DE genes in datasets at least three pairs of samples and they were all biased to find genes with low expression levels. Besides, SAM or RP might miss many drug resistance-related biological pathways which could be identified by PD. Therefore, the PD algorithm is an effective supplementary method to SAM and RP. Refer to this link:http://www.cusabio.com/Recombinant-Protein/Recombinant-Escherichia-coli-strain-K12-Signal-peptidase-I-11089634.html

Gene Lr67 identified to resist important wheat diseases

Food problems always draw attention of the whole world. The foremost one is absolutely the grain yield which is often affected by crop diseases. Good news is that researchers have identified a gene that can prevent some of the most important wheat diseases. It is estimated that this finding can save more than a billion dollars in lost production in Australia alon every year. Through the global collaboration among the University of Sydney Plant Breeding Institude (PBI), the CSIRO, CIMMYT (Mexico), University of Newcastle, Chinese Academy of Sciences and the Norwegian University of Life Sciences, the gene Lr67 has been identified to resist 3 of the most important wheat rust diseases and another siginificant disease in Norway, powdery mildew. It is predicted that wheat will provide a fifth of global caloric intake and set to spike in the next 50 years. This study published in Nature Genetics will benefit much to wheat harvest. There is more work to be done about this Lr67 gene. More research will be conducted to study its working performance. Read more if it attracts you>>>http://www.cusabio.com/Recombinant-Protein/Recombinant-human-Target-of-rapamycin-complex-2-subunit-MAPKAP1-11089635.html

Learning more about low birth weight live birth

Syncytial knots are seen with increased frequency in the last weeks of pregnancy and more villi show these changes in high risk pregnancies.Out of 50 placentas, 44 showed increased number of syncytial knots (88%) in the present study. Fibrinoid necrosis is nothing but a fibrinoid patch that replaces villous stroma and the vasculature underneath a more or less intact trophoblastic cover. It occurs occasionally in normal mature placentas, but the incidence is increased in complicated pregnancies. Significant villous fibrinoid necrosis was noted in 44 cases (88%) in the placentas of PIH, anemia and IUGR. These findings are in concordance with other studies. The incidence of villi showing a thickened basement membrane in more than 3% of the villous population is regarded as abnormal and is a common feature of placentas from complicated pregnancies. In the present study, 25 placentas showed increased basement membrane thickness (50%). These findings concurred with those of other authors. In the present study, 32% of placentas showed stromal fibrosis. There was an increased incidence of fibrotic placenta in pregnancy complicated by Fox et al, also correlated with this finding. Vasculosyncytial membrane (VSM) is an index of fetal hypoxia. The incidence of VSM deficiency was noted in 34% of cases. The paucity of VSM was seen in higher grades of PIH, correlating with the severity of disease. Chorangioma is an expansile nodular lesion composed of capillary vascular channels, intervening stromal cells and surrounding trophoblasts. Intermediate sized chorangioma are associated with IUGR.In the present study, one case of chorangioma was found. In conclusion, placental morphological changes increase in direct proportion to the severity of diseases in high risk pregnancies. Study of these features in placenta will help to understand the role of the placenta in LBW live births and may give an insight into the etiopathogenesis of intrauterine growth retardation. Learn more here>>>http://www.cusabio.com/Recombinant-Protein/Recombinant-Mus-musculus-Mouse-Perforin-1-11090031.html

Why only particular animal species are infected by Salmonella?

You may know that many strains of Salmonella bacteria are specific to certain species of animals. Some of them may infect cows, pigs, chickens or sheep, still others infect primarily humans. Recently, a study by a team of scientists from University of Pennsylvania showing that slight variations in the coding sequence of proteins that bind Salmonella to host cells can determine what type of animal a particular strain infects. The findings were gotten using genomic techniques. The team first focused on the analyses of Salmonella enterica serovar Typhimurium, a leading cause of food poisoning. But it is still a mystery for which the molecular basis for host preferences is. Single nucleotide polymorphisms (SNPs), variations in the nucleotide sequence of DNA, were identified through the genomic analyses. They found a relatively large number of SNPs, in genes coding for Salmonella surface proteins or secreted factors. Different host species would share patterns of these so-called non-synonymous SNPs, creating different protein sequences and structures. Through analyzing of 15 genes in 580 strains of Typhimurium, the team found a high degree of variation and evidence of positive selection and strong evidence that the variation was associated with the particular strains' host specificity. Further research will be conducted to determine the genetic differences that may separate a strain of Salmonella that causes a brief gastrointestinal illness from one that cause a major systemic disease. The study was published in the Nature Communications. You may like this>>>http://www.cusabio.com/Recombinant-Protein/Recombinant-Homo-sapiens-Human-T-cell-surface-glycoprotein-CD8-alpha-chain-11090032.html

Increase targeting range to improve the usefulness of more compact CRISPR-Cas9

A method was developed by a team of investigators from Massachusetts General Hospital, short for MGH, to improve the usefulness and precision of the most common form of the gene-editing tools CRISPR-Cas9 RNA-guided nucleases. This method can be applied to Cas9 enzymes from other bacterial sources. The method was published in the online publication, Nature Biotechnology. The study evolves a variant of SaCas9 — the Cas9 enzyme from the Streptococcus aureus bacteria — that recognizes a broader range of nucleotide sequences. This allows targeting of genomic sites previously inaccessible to CRISPR-Cas9 technology. According to Benjamin Kleinstiver, PhD, a research fellow in the MGH Molecular Pathology Unit, the development of Cas9 variants with a broader targeting range is particularly important for applications requiring precise targeting of genomic sequences. What's more, the coding sequence of SaCas9 is twenty-three percent smaller than that of SpCas9. It is the version derived from Streptococcus pyogenes, which is a size difference that makes SaCas9 advantageous for potential therapeutic applications requiring delivery by viruses. Kleinstiver is also the lead and co-corresponding author of the Nature Biotechnology paper As we know that CRISPR-Cas9 nucleases are comprised of a short RNA molecule, twenty nucleotides of which match the target DNA sequence, and a Cas9 bacterial enzyme that cuts the DNA in the desired location. Cas9 needs to recognize an adjacent nucleotide sequence which is called a protospacer adjacent motif (PAM) during the match between the RNA and DNA sequences. In their studies published before in the Nature, the team from MGH showed a genetic system that enabled them to rapidly evolve SpCas9 to recognize different PAM sequences. The team was able to evolve versions of SpCas9 that recognize a broader range of PAM sequences, which doubles the range of targetable sites. The team turned to SaCas9 in their recent study. It naturally requires the PAM sequence NNGRRT - in which R can be either adenine or guanine and T must be thymine - adjacent to its target DNA. They were successful to develop a variant called KKH SaCas9 which recognizes PAM sequences with any nucleotide in the third position. The results increased the targeting range for two to four times. J. Keith Joung, MD, PhD is an associate chief of Research in the MGH Department of Pathology, professor of Pathology at Harvard Medical School, and co-corresponding author of the Nature Biotechnology paper. He is quite confident about this directed evolution approach. He thinks it can be used to modify the PAM specificity of SaCas9, which greatly expands the number of genomic sites that can be accessed by the important Cas9 nuclease. Targeting sites precisely is quite important for researchers who are involved in disrupting small genetic elements and DNA repair by homologous recombination. This method can provide an important blueprint for altering the recognition properties of the worth of Cas9 nucleases existing in many bacteria, according to Joung. Read more here:http://www.cusabio.com/Recombinant-Protein/Recombinant-Xenopus-laevis-African-clawed-frog-Transforming-growth-factor-beta-1-11090034.html

New findings: some guppies have the ability of counting

A new research shows that the little guppies are smarter than we usually think. Some of them can count. The research was conducted by Associate Professor Culum Brown, from the Department of Biological Sciences at Macquarie University, and colleagues from the University of Padova. It is published in Frontiers in Behavioural Neuroscience, describing the surprising ability. After research, Professor Brown said that guppies that have very strongly lateralised brains are better at counting than those that have non-lateralised brains. For humans, the left hemisphere is often associated with language and maths, while the right hemisphere is more artistic. Scientists are always wondering why humans and other animals have lateralised brains, where the two halves of their brain execute different functions. There is a theory suggesting that having strongly lateralised brains allows each hemisphere to analyse information separately. The research shows that fish with strongly lateralised brains could distinguish between three versus four objects, while those with non-lateralised brains could only distinguish two versus three. Comparing sets of objects containing four items seems to be the upper limit of most animals — after this animals including humans switch to another system that relies on ratios when comparing sets. Further reading:http://www.cusabio.com/Recombinant-Protein/Recombinant-human-Medium-chain-specific-acyl-CoA-dehydrogenase-mitochondrial-11089628.html

Electrical eels deliver more electrical shocks by curling up

Electrical eels' ability of stunning preys then locating them through the similar power was found by Kenneth Catania, Stevenson Professor of Biological Sciences from Vanderbilt University. He has spent three years studying on this fish lived in South America and come to the conclusion. Almost two thirds of the eel's body is filled with specialized cells which is called electrocytes. They can store electricity acting as batteries. The cells discharge simultaneously which is at least 600 volts when an eel is around its prey. Catania found that the eels have a special skill to double the electrical shock that they can deliver to particularly large or difficult prey. The findings are reported in the journal Current Biology on Oct. 29. The eel had a second attack when it realized there is bigger fish and it is more difficult to beat the prey. Under these circumstances, the eel first bits the prey and curls its tail around the body of the prey until the tail lies directly across the body from the eel's head. Then the electrical pulses are greatly increased. The weapon used by electrical eels, that is the high-voltage system, is much complex than we thought. You may like the content below:http://www.cusabio.com/Recombinant-Protein/Recombinant-mouse-Oxysterol-binding-protein-related-protein-11-11089629.html

Electrical eels use electrolocation to locate prey

A study published in the journal Nature Communications describes the ability of electric eels to stun prey and locate them using their electrical powers. The study is reported by Kenneth Catania, a biological scientist from Vanderbilt University. The study shows how the electric eels use electrolocation to find the stunned prey. The jolt of electricity released by electric eel won't kill prey, which is contrary to what is believed by most people. The harm can only cause the prey's muscles to spasm uncontrollably, thus making it stunned and unable to escape. But this explanation is far from enough. You may know that the eel lives in the murky depths of the Amazon River, and it is hard to see far. How can the eels find a fish which just stunned? Catania conducted two sets of tests and drew a conclusion in the study that these eels are using the same electricity, that is electrolocation, which they used to stun preys. Read more:http://www.cusabio.com/Recombinant-Protein/Recombinant-Horse-Myelin-P2-protein--11089630.html

A new computational method developed to study protein dynamics

Researchers have developed the first computational method based on evolutionary principles to predict protein dynamics. These researchers are from the Structural Biology Computational Group of the Spanish National Cancer Research Centre (CNIO), led by Alfonso Valencia, together with a group led by Francesco Gervasio at the University College London (UK). Protein dynamics can explain the changes in the shape or dimensional structure that they experience in order to interact with other compounds or speed up chemical reactions. This study push the development of the computational study of protein dynamics, and it is helpful for the design of drugs and for the research about genetic disease. It is published in the journal Proceedings of the National Academy of Sciences (PNAS). As we know, proteins are crucial to the thousands of cellular functions which work in a living organism. It is chains of smaller molecules which are called amino acids that form the protein - a three-dimensional structure. By studying the co-evolution of amino acids, we can reconstruct the form or structure of these biological compounds in their natural surroundings. We can also predict physical contacts between amino acids with higher accuracy and in sufficient number by analyzing the sequences of a given family of proteins, to reconstruct the folding and structure of a protein accurately. Nevertheless, the structure won't remain changeless. It interacts with other biological compounds or with drugs, which is called protein dynamics. The study about it turns out to be extremely difficult no matter through experimental observations or computational tools. "We developed a model in which the amino acids that have a strong co-evolutionary relationship attracted each other, without further additional data," says Simone Marsili, researcher who has also participated in the project. "First, we simulate the folding process and then we can see how the simulations were able to predict the changes in shape of the proteins at different levels of complexity, including those required for kinases to function." By using the latest sequence analysis and 3D modeling technology, this new method combines experimental with genomic data. It also shows that genomic For more wonderful readings, click here:http://www.cusabio.com/Recombinant-Protein/Recombinant-Influenza-A-virus-strain-AEngland8781969-H3N2-Hemagglutinin-11089552.html

New unexpected findings of cell division published

In order to understand more about the mechanisms of cell division, researchers have conducted a series of research using eggs and embryos from frogs and starfish. They unexpectedly found new findings about how animal cells control the forces that shape themselves. The researchers published the paper in the online journal Nature Cell Biology. The study points out that during the process in which a cell divides its cytoplasm to create two daughter cells, which is called cytokinesis, a cell's cortex becomes an excitable medium. We all know that cytokinesis is highly dynamic, but an animal cell has no idea where it will happen before it really happens. The cell has literally ripped itself in two after the things happen. The contractile machinery is quite ephemeral, according to co-author George von Dassow, a University of Oregon biologist at the Oregon Institute of Marine Biology in Charleston. How the cell manages to ensure that the entire surface can participate is not obvious now. However, once specified, only one narrow equatorial band does the crucial act. After chromosomes separate deep in the cell cytoplasm, the surface of the cell immediately enters an excitable state, added von Dassow. During the state, waves of signaling molecules form. They tune in faint signals from deep in the cell to accurately and precisely delineate the working conditions for contractile proteins and other enzymes to assemble at the right place, in the right amount and at the right time during cell division, or during other cell-shape stage. The researchers show in the study that this "cell-cycle-entrained behavior" in the cortex is present in both vertebrates and invertebrates. The dynamic behavior will be clearer combining high-resolution live-cell imaging and mathematical modeling. Related reading:http://www.cusabio.com/Recombinant-Protein/Recombinant-Autographa-californica-nuclear-polyhedrosis-virus-AcMNPV-Viral-cathepsin-11089554.html

See the embodiment of innovation from prawns

I guess that you all have heard about the shocking news of super expensive prawns from Qingdao of China recently. The huge prawns bill sparks outrage online in China. Humans should pay for what they have eaten. But do you know what hungry prawns do to get their food? A new research about prewns is published yestoday in the journal PLOS ONE. According to the study, small and hungry prawns are more likely to be resourceful in the face of adversity than their less desperate counterparts. What's worthy to say, size and hunger have different effects, which depends on whether the prawns are acting alone or in a group. To be more specific, small individuals were more likely to innovate when they are alone.However, when they are in a group, size didn't matter and it was the hungry prawns that are more likely to be most resourceful. Innovation can allow individuals, no matter they are prawns or primates, to access new resources and deal with new urgent incidents. But we can know that the drivers of innovation are more complex than previously thought. Read more:http://www.cusabio.com/Recombinant-Protein/Recombinant-human-Target-of-rapamycin-complex-2-subunit-MAPKAP1-11089635.html

What's the link between male fistfights over females and human hand proportionsevolution?

You must be surprised that there is a link between male fistfights over females and human hand proportionsevolution. But what is it? A study conducted byUniversity of Utah have found new support for a theory that human hand proportions evolved not just for fine manipulation, but also to make a clenched fist that would buttress the hand to reduce the chance of injury or fracture during male fistfights over females. You can imagine that open-fist punches and open-handed slaps placed more strain on hand bones, which will increase the risk of injury during fights. The study is published online Oct. 21 in the Journal of Experimental Biology. This syudy is controversial for the moment. What do you think? Click here to know more:http://www.cusabio.com/Recombinant-Protein/Recombinant-Homo-sapiens-Human-Procollagen-C-endopeptidase-enhancer-2-11090019.html